Embed Size (px)
Citation preview
Problems with telephone hookupProblems with telephone hookup Contact the operator at the University of Contact the operator at the University of
IllinoisIllinois 1-800-347-82681-800-347-8268 Then hit 0 for the operatorThen hit 0 for the operator
Mute your phone by hitting 5 if you donrsquot we will
Problems with Telebridge SystemProblems with Telebridge System Hit 0Hit 0
Welcome to Session 5
ldquoThe Interaction of
Crossbred Genetics with
Environmentsrdquo
Welcome to Session 5
Your host
Dr Bob Weaber
Beef Cattle Extension Specialist University of
Missouri
Session 5Session 5
ldquoThe ldquoThe Interaction of Interaction of
Crossbred Crossbred Genetics with Genetics with
EnvironmentsrdquoEnvironmentsrdquo
Dr Don KressDr Don KressProfessor EmeritusProfessor Emeritus
Montana State UniversityMontana State University
Todayrsquos presenters
Dr Don FrankeDr Don FrankeProfessor EmeritusProfessor Emeritus
Louisiana State UniversityLouisiana State University
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
ldquoThe Interaction of
Crossbred Genetics with
Environmentsrdquo
Welcome to Session 5
Your host
Dr Bob Weaber
Beef Cattle Extension Specialist University of
Missouri
Session 5Session 5
ldquoThe ldquoThe Interaction of Interaction of
Crossbred Crossbred Genetics with Genetics with
EnvironmentsrdquoEnvironmentsrdquo
Dr Don KressDr Don KressProfessor EmeritusProfessor Emeritus
Montana State UniversityMontana State University
Todayrsquos presenters
Dr Don FrankeDr Don FrankeProfessor EmeritusProfessor Emeritus
Louisiana State UniversityLouisiana State University
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Your host
Dr Bob Weaber
Beef Cattle Extension Specialist University of
Missouri
Session 5Session 5
ldquoThe ldquoThe Interaction of Interaction of
Crossbred Crossbred Genetics with Genetics with
EnvironmentsrdquoEnvironmentsrdquo
Dr Don KressDr Don KressProfessor EmeritusProfessor Emeritus
Montana State UniversityMontana State University
Todayrsquos presenters
Dr Don FrankeDr Don FrankeProfessor EmeritusProfessor Emeritus
Louisiana State UniversityLouisiana State University
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Session 5Session 5
ldquoThe ldquoThe Interaction of Interaction of
Crossbred Crossbred Genetics with Genetics with
EnvironmentsrdquoEnvironmentsrdquo
Dr Don KressDr Don KressProfessor EmeritusProfessor Emeritus
Montana State UniversityMontana State University
Todayrsquos presenters
Dr Don FrankeDr Don FrankeProfessor EmeritusProfessor Emeritus
Louisiana State UniversityLouisiana State University
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Dr Don KressDr Don KressProfessor EmeritusProfessor Emeritus
Montana State UniversityMontana State University
Todayrsquos presenters
Dr Don FrankeDr Don FrankeProfessor EmeritusProfessor Emeritus
Louisiana State UniversityLouisiana State University
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
THE INTERACTION OF THE INTERACTION OF CROSSBRED CROSSBRED
GENETICS WITH GENETICS WITH ENVIRONMENTSENVIRONMENTS
Don KressDon KressMontana State UniversityMontana State University
Don FrankeDon FrankeLouisiana State UniversityLouisiana State University
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
OVERVIEWOVERVIEW
II IntroductionIntroduction
IIII BasicsBasicsAA Definition of G x E or GEIDefinition of G x E or GEI
BB Due to Due to magnitudemagnitude or or change in change in rankrank
IIIIII Research ResultsResearch ResultsAA Bos taurusBos taurus
BB Bos indicusBos indicus
IVIV SummarySummary
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
DEFINITIONDEFINITION
G x E or GEI occurs G x E or GEI occurs when when differences differences among Grsquos change from among Grsquos change from one E to another Eone E to another E
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
G x E DUE TO CHANGE IN G x E DUE TO CHANGE IN MAGNITUDEMAGNITUDE
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
G x E DUE TO CHANGE IN RANKG x E DUE TO CHANGE IN RANK
350
375
400
425
Low High
ENVIRONMENT
WW
CE
(lb
s)
G1 G2
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PRODUCTIVITY OF DIFFERENT PRODUCTIVITY OF DIFFERENT BIOLOGICAL TYPES OF COWS AT BIOLOGICAL TYPES OF COWS AT
HAVRE MONTANA HAVRE MONTANA
300
325
350
375
400
425
HH AH 1S3H SH 3S1H
COW BIOLOGICAL TYPE
WW
CE
(lb
s)
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
COW WEIGHT AND PRODUCTIVITY IN COW WEIGHT AND PRODUCTIVITY IN EASTERN MONTANA AT LARRLEASTERN MONTANA AT LARRL
1100
1150
1200
1250
1300
1350
RPH AH PH SH
COW BIOLOGICAL TYPE
CO
W W
T (lb
s)
350
375
400
425
450
WW
CE
(lb
s)
COW WT WWCE
MacNeil et al (1992)
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PRODUCTIVITY OF TWO BIOLOGICAL PRODUCTIVITY OF TWO BIOLOGICAL TYPES OF COWS AT TWO LOCATIONS TYPES OF COWS AT TWO LOCATIONS
IN MONTANAIN MONTANA
350
375
400
425
NARC LARRL
LOCATION (LEVEL OF NUTRITION)
WW
CE
(lb
s)
AH SH
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF PRODUCTIVITY OF FOUR BIOLOGICAL TYPES OF COWS UNDER THREE LEVELS OF NUTRITION IN COWS UNDER THREE LEVELS OF NUTRITION IN
AUSTRALIAAUSTRALIA
100
175
250
325
400
475
LOW MEDIUM HIGH
LEVEL OF NUTRITION
WW
CE
(lb
s)
HH BH SH FH
Hearnshaw and Barlow (1982)
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PRODUCTIVITY OF COW BIOLOGICAL PRODUCTIVITY OF COW BIOLOGICAL TYPES IN CANADATYPES IN CANADA
200
250
300
350
400
MANYBERRIES BRANDON
CO
W E
FF
HA LA LH LN SA SH SN
Fredeen et al (1987)
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF PRODUCTIVITY OF TEN BIOLOGICAL TYPES OF COWS IN TWO NEW ZEALAND LOCATIONSCOWS IN TWO NEW ZEALAND LOCATIONS
70
80
90
100
110
120
130
TOKANUI GOUDIES
LOCATION (LEVEL OF NUTRITION)
WW
CE
(
)
AH Sx SDx Cx Lx Bax Max CHx Jx Fx
Baker and Carter (1982)
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF PREDICTED BIOLOGICAL EFFICIENCY (GRAMS OF CALF WEANEDCALF WEANEDKILOGRAM DRY MATTER INTAKEKILOGRAM DRY MATTER INTAKE-1-1COW COW EXPOSEDEXPOSED-1-1) AT VARYING DRY MATTER INTAKES FOR ) AT VARYING DRY MATTER INTAKES FOR NINE BREEDS OF CATTLENINE BREEDS OF CATTLE
Jenkins et al (1994)
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
SUMMARYSUMMARY
II Important GxE interactions are Important GxE interactions are those due to change in rankthose due to change in rank
IIII There are important GxE There are important GxE interactions for Bos taurus interactions for Bos taurus crossbred cow productivitycrossbred cow productivity
IIIIII Most of these important Most of these important interactions involve reproductive interactions involve reproductive traitstraits
IVIV It is important to match the It is important to match the genetic potential of Bos taurus genetic potential of Bos taurus crossbred cows to the environmentcrossbred cows to the environment
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
A large majority of cattle operations in the Southern Region are commercial cow-calf herds Many operations utilize Brahman crosses of one form or another
My objective is to review breed type x environmental interactions involving Brahman cross cows
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Pregnancy rate in FL and NEPregnancy rate in FL and NE
70
80
90
100
Florida Nebraska
Per
cent
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Weaning weight in FL and Weaning weight in FL and NENE
190
200
210
220
230
240
250
260
Florida Nebraska
Kilo
gram
s
Hereford x AAngus x HPinzgauer x APinzgauer x HBrahman x ABrahman x HSahiwal x ASahiwal x H
Olson et al (1991)
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Heifer pregnancy rate in OK Heifer pregnancy rate in OK when exposed to calve in when exposed to calve in
Spring and FallSpring and Fall
01020304050
60708090
100
Spring Fall
Per
cent 0 Brahman
25 Brahman50 Brahman
Bolton et al (1987)
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Age at first calf for Spring Age at first calf for Spring and Fall calving in OKand Fall calving in OK
700
800
900
1000
1100
Spring Fall
Day
s
Hereford x AAngus x HF1 B-A x HF1 B-H x ABrahman x ABrahman x H
McCarter et al (1991)
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Lifetime calving percent for Lifetime calving percent for Spring and Fall calvingSpring and Fall calving
55
65
75
85
95
Spring Fall
Perc
ent
Hereford x AAngus x HF1 B-H x AF1 B-A x HBrahman x ABrahman x H
McCarter et al (1991)
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Calving rate of crossbred heifers Calving rate of crossbred heifers exposed to calve at 24 30 or 36 exposed to calve at 24 30 or 36
mo in LAmo in LA
20
30
40
50
60
70
80
90
100
24 mo 30 mo 36 mo
Per
cen
t Angus xBrahman xCharolais xHereford x
DeRouen et al (1989)
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Weaning rate of Brahman Weaning rate of Brahman Shorthorn and B ndash S crossbreds Shorthorn and B ndash S crossbreds
on three pasture programs in on three pasture programs in FLFL
50
60
70
80
90
Native Nat + Imp Improved
Per
cent
Brahman34 B - 14 SF1 B - S34 S - 14 BShorthorn
Peacock et al (1971)
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Production per cow on three Production per cow on three pasture programs in FLpasture programs in FL
70
90
110
130
150
170
190
Native Nat + Imp Improved
Kilo
gram
s
Brahman34 B - 14 SF1 BxS34 S - 14 BShorthorn
Koger et al (1975)
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Calf weaning weight on Calf weaning weight on bermuda and tall fescue bermuda and tall fescue
pastures in ARpastures in AR
180
190
200
210
220
230
240
250
Bermuda Fescue
Kilo
gram
s AngusF1 B x AF1 A x BBrahman
Brown et al (1993)
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Calving percent on bermuda Calving percent on bermuda fescue and combination fescue and combination
pastures in ARpastures in AR
50
60
70
80
90
100
Bermuda Fescue Rotation
Per
cent
AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Weaning weight per cow exposed Weaning weight per cow exposed on bermuda fescue and on bermuda fescue and
combination pastures in ARcombination pastures in AR
7090
110130150170
190210230250270
Bermuda Fescue Rotation
Kilo
gram
s AngusF1 A x BF1 B x ABrahman
Brown et al (2000)
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
SummarySummary
Important GEI exist with Important GEI exist with Brahman cross cowsBrahman cross cows
Fall calving reproductive Fall calving reproductive rates were lower and rates were lower and decreased with increasing decreased with increasing Brahman inheritanceBrahman inheritance
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Summary contSummary cont Brahman crossbred cows Brahman crossbred cows
seem to be more tolerant to seem to be more tolerant to differences in quality of differences in quality of pasture programs than pasture programs than Bos Bos taurus taurus cowscows
Cow breed types should be Cow breed types should be matched with the matched with the environmental conditions and environmental conditions and resources that are availableresources that are available
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
Session 6 on November Session 6 on November 8th8th
Dr Darrh Dr Darrh BullockBullock
University of University of KentuckyKentucky
ldquoIs there Gold in Them Thar Crossbreeding Hillsrdquo
