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.

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Presentation transcript:

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 scrotum Females - vagina opens & estrus begins

Monestrous - in heat once a year Examples: Prairie voles Wolves 90% 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 Mom we Luv u!! Text Beinging Polytoccus sucks

Polytoccus Monotocous versus

Mouse uteruses (two)

Female Roles: Produce Eggs Nurture developing embryo Nurse young Male Roles: Produce Sperm Deposit in the vagina I have it rough

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 ready for the same reason their not ready Probably be unsuccessful because they are to immature and under weight

4 stages of the estrus cycle: Proestrus Estrus metestrus Diestrus 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 Mating Advantages: 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 Palpations 2. Weight Gains 3. Gonadotrophs

Precautions for some pregnant females Okay Text Blop/Splat High Protein Diet

Fostering What adopted mommy do you want?

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