Full size dairy type goat does can be bred at about 8 months of age if they have "made weight". I have heard of people who wait until a doe is 1 1/2 years old before breeding her. People do this because they think the doe will grow better if you wait to breed her, but if the doe is well taken care of and fed properly she will grow just as well bred as unbred. We have three kidding stalls and only breed three does in a "batch".
We let the does have their personal clean stall with their kids for two weeks after kidding (they do get to come out during the day as the kids progress).
First let me start by saying PLEASE, DO NOT "run" your buck with you does.
If you do, you will have no control over breeding and will have no idea when to expect kids.
Our bucks and does live very happy, separate lives, and only meet each other when we take them on "dates".
Believe it or not, a goat kid of either sex can be fertile at 7 weeks of age.
If giving your rat babies to a pet store be aware they may sell your rats for snake food/Feeder rats rather then selling them for pets.
You can try posting re homing ads in your local paper, local supermarket or town square, Petfinder, or on rat email/online communities.
Human males are often seen as competitors, while human females are seen as potential mates.
The male generally becomes active (reproductively speaking) first.
In the wild, this adaptation allows him to obtain a suitable nesting site before attracting a mate.
Rats can breed as young as 4 weeks, altho usually won't until 6 weeks. A Prolapse is when a female gives birth and then her uterus basically falls out and needs to be put back inside.
If a Female prolapses it is unlikely she will nurse her babies.