Quote Originally Posted by Doxster View Post
It varied a little, at least 3-4 weeks when I got them about 3 weeks ago.

I will rotate when they start producing, I want to switch over my entire bp collection on rats so I can get rid of the damn mice. So I will need 24 rats every week.
Females take 4-6 months in age till they can have litters. And it took me 2 months to get my first litter when I started. Just depends.