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?