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Project AC0115 Final Report
Appendix D: Preliminary synthesis of new data
April 2014
Introduction This appendix presents the results of preliminary analyses of the new data collected as part of AC0115. It combines data collected from controlled experiments with that collected as part of on-farm measurements. A final synthesis of the data for production of UK-specific emission factors for a new greenhouse gas reporting inventory will take place as part of project AC0114.
AC0115 Final Report Appendix D - Page 1
AC0115 – New methane data
Les Crompton, Jon Mills & Chris Reynolds
AC0115 – New methane data
2
1720 new data points
Sheep 535
Cattle 1185
AC0115 Final Report Appendix D - Page 2
3
Min MaxDM intake, kg/d 0.2 24.5Methane, g/d 6 590Live weight, kg 23 956Nitrogen, g/kg DM 9 51NDF, g/kg DM 247 780
Breeds: 8 sheep; 8 cattleForages: 7 sheep; 11 cattle
AC0115 – New methane data
Dry matter intake (kg/d)0 5 10 15 20 25 30 35
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400
500
600
700ArchiveAC0115
Archive and AC0115 data
AC0115 – New methane data
4
AC0115 Final Report Appendix D - Page 3
Dry matter intake (kg/d)0 5 10 15 20 25 30
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400
500
600Cattle dryCattle growingCattle lactatingCattle matureSheep barren Sheep growing Sheep mature
5
Species and physiological state
AC0115 – New methane data
CH4 = 17.7 x DMI + 17.0
r2 = 0.80
Dry matter intake (kg/d)0 5 10 15 20 25 30 35
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400
500
600
700Chamber/SF6 dataGreenfeedSniffer
6
Methane technique
AC0115 – New methane data
AC0115 Final Report Appendix D - Page 4
7
Cattle data - examples
Dry matter intake (kg/d)0 5 10 15 20
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400Cattle growingCattle mature
8
CATTLE - physiological state
AC0115 – New methane data
AC0115 Final Report Appendix D - Page 5
Dry matter intake (kg/d)0 5 10 15 20
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400Aberdeen Angus cross Charolais Holstein Limousin cross Luing Welsh Black
9
CATTLE - breed
AC0115 – New methane data
Dry matter intake (kg/d)0 5 10 15 20
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400Barley straw Glenwherry Mature Glenwherry immature Grass silage Hill mosaic Maize silage Perenial ryegrass Ryegrass/birdsfootRyegrass/flowersRyegrass/red cloverUpland Pasture
10
CATTLE - forage
AC0115 – New methane data
AC0115 Final Report Appendix D - Page 6
Dry matter intake (kg/d)0 5 10 15 20
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400Castrate Female Male
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CATTLE - gender
AC0115 – New methane data
Liveweight (kg)0 200 400 600 800 1000
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400
500Cattle growingCattle mature
CATTLE – liveweight
AC0115 – New methane data
12
AC0115 Final Report Appendix D - Page 7
13
Sheep data - examples
Dry matter intake (kg/d)0.0 0.5 1.0 1.5 2.0 2.5 3.0
Met
hane
pro
duct
ion
(g/d
)
0
10
20
30
40
50Sheep barren Sheep growing Sheep mature
14
SHEEP – physiological state
AC0115 – New methane data
AC0115 Final Report Appendix D - Page 8
Liveweight (kg)0 20 40 60 80 100
Met
hane
pro
duct
ion
(g/d
)
0
10
20
30
40
50Sheep barren Sheep growing Sheep mature
15
SHEEP – liveweight
AC0115 – New methane data
Dry matter intake (kg/d)0.0 0.5 1.0 1.5 2.0 2.5 3.0
Met
hane
pro
duct
ion
(g/d
)
0
10
20
30
40
50Belclare cross Highlander cross Scottish Blackface Scottish Mule Texel Texel cross Welsh Mountain Welsh Mule
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SHEEP - breed
AC0115 – New methane data
AC0115 Final Report Appendix D - Page 9
Dry matter intake (kg/d)0.0 0.5 1.0 1.5 2.0 2.5 3.0
Met
hane
pro
duct
ion
(g/d
)
0
10
20
30
40
50Grass nuts Hill mosaic Holcus/CarexLolium/Agrostis/FescueMolinia/hill grass/rushPerenial ryegrass
17
SHEEP – forage
AC0115 – New methane data
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Methane emission factors
AC0115 Final Report Appendix D - Page 10
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Ym % GEI Methaneg/kg DMI
Archive dataCattle lactating 6.29 21.3Cattle non-lactating 6.93 23.2Cattle dry 7.87 26.3
AC0115 dataSheep 6.12 20.2Cattle lactating 6.00 20.3Cattle growing/mature 6.16 21.0Cattle dry 7.02 25.0
Methane emission factors
Dry matter intake (kg/d)0 5 10 15 20 25 30
Met
hane
ene
rgy
as p
erce
ntag
e of
GE
I
0
2
4
6
8
10IPCC Archive lactating cattleArchive non-lactating cattleSheepCattle growing & mature Cattle lactatingCattle dry
20
Methane emission factor YmArchive and AC0115 data
AC0115 Final Report Appendix D - Page 11
21
Methane emission factor Ym
Methane energy as percent of GE intake0 2 4 6 8 10 12 14
Met
hane
pro
duct
ion
(g/d
)
0
10
20
30
40
50Sheep barren Sheep growing Sheep mature
SHEEP – %GEI vs methane
Methane energy as percent of GE intake0 2 4 6 8 10 12 14 16 18
Met
hane
pro
duct
ion
(g/d
)
0
100
200
300
400
500Growing cattle Mature cattle
22
Methane emission factor YmCATTLE – %GEI vs methane
AC0115 Final Report Appendix D - Page 12
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Summary
• New data for sheep and cattle
• On-farm technology not reliable for EF synthesis
• No major effect of gender, breed or forage
• Physiological state may be important
24
Summary
• Main driver for methane production is intake
• Ym ~ 6 % - negative relationship with intake
• AC0115 data analysed
• Combined with archive for final EF synthesis
AC0115 Final Report Appendix D - Page 13
