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Animal Reproduction. Chapter 4. Menopause - I am done no more kids. Male. I am never to old to do it!!!. Puberty - mom why is that male rat eyeing me up?. Females. Males - testes descend into the scrotum. Females - vagina opens & estrus begins. Monestrous - in heat once a year.

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Presentation Transcript

Menopause - I am done no more kids

Male

I am never to old to do it!!!

Puberty - mom why is that male rat eyeing me up?

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



Beinging

Polytoccus

sucks

Come on kids it is time to leave home

Text

No Mom

we Luv u!!

These short estrus cycles are killing me


Polytoccus

versus

Monotocous


uteruses

(two)

Mouse


I have it

rough

Female Roles:

Produce Eggs

Nurture developing embryo

Nurse young

Male Roles:

Produce Sperm

Deposit in the vagina


Embryo

versus

Fetus

?????????


Altricial

Precocial




They look

ready to me

Yes we are in our first estrus; but please do not let him in.

Why?


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


I luv u

& u only!!!

Polygomous mating versus monogamous mating


Lordosis - position some females take to indicate she is in estrus/heat



Polygamous Mating the attention of male rats

Advantages:

Fewer males

Efficient use of cages


Disadvantages of Polygamous mating: the attention of male rats

Who is Sophie?

Who is daddy?

I am getting hurt down here


Diagnosing a Pregnancy: the attention of male rats

1. Abdominal Palpations

2. Weight Gains

3. Gonadotrophs


Text the attention of male rats

Okay

Okay

Precautions for some

pregnant females

High Protein

Diet

Blop/Splat


Fostering the attention of male rats

What adopted mommy

do you want?


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