Quote Originally Posted by tomfromtheshade View Post
12 weeks is the minimum that I would wait.

16 weeks assures that they are fully developed and big enough.

Its really up to you.

If you want to breed them younger than 12 weeks they may not conceive or they may have smaller litters.

Its a gamble.
I'll agree with that. Some of my girls don't take for a month or two after they have been with the males. Then others will take right away and give me a litter of 13 the first time. BUT, I've only been holding back females from moms that have been giving me big litters at young ages. 3 generations in a row I've had the first time moms give me 13. It's weird, but I'm really liking my girls.