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Animal Reproduction
Chapter 4
I am never to old to do it!!!
Puberty - mom why is that male rat eyeing me up?
Menopause - I am done no more kidsMale
Females
Males - testes descend into the
scrotumFemales - vagina opens &
estrus begins
Monestrous - in heat once a year
Examples:Prairie voles
Wolves90% of the birds
Polyestrous - in heat multiple times a year
These short estrus cycles are killing me
Come on kids it is time to leave home
No Momwe Luv u!!
TextBeingingPolytoccus
sucks
Polytoccus
Monotocousversus
Mouse
uteruses(two)
Female Roles:Produce Eggs
Nurture developing embryo
Nurse young Male Roles:Produce Sperm
Deposit in the vagina
I have itrough
Embryo versus Fetus
?????????
Precocial
Altricial
Precocial or Altricial?
Pseudopregnancy or Pregnant?
Yes we are in our first estrus; but please do not let him in.
Why?
They look ready to me
I am not readyfor the same reason
their not ready
Probably be unsuccessful because they are to immature
and under weight
4 stages of the estrus cycle:Proestrus
EstrusmetestrusDiestrus
Estrus baby; is when I am ready
to make babies
Polygomous mating versus monogamous
mating
I luv u & u only!!!
Lordosis - position some females take to indicate she is in
estrus/heat
Female rats twitch their ears when there in estrus to get the attention of male rats
Polygamous MatingAdvantages:Fewer males
Efficient use of cages
Disadvantages of Polygamous
mating:Who is Sophie?Who is daddy?
I am getting hurt down here
Diagnosing a Pregnancy: 1. Abdominal
Palpations2. Weight Gains
3. Gonadotrophs
Precautions for somepregnant females
Okay
Okay
Blop/SplatHigh Protein
Diet
Fostering
What adopted mommy do you want?