Quote Originally Posted by Jay_Bunny View Post
They will be weaned on the 18th and will be breedable as of April 15th.
I checked your earlier posts, and it looks like these litters were born around January 20. That is 4 full weeks until your weaning date, and 12 full weeks until your breeding date.

I don't wait nearly that long with my mice. I wean them when they are about 3 weeks old. When I put them in breeding colonies is pretty variable, depending on what I need at the moment, but even leaving a female in with the colony to grow up & be bred as soon as she comes in season seems to work ok. I've also done the reverse, leaving a boy in with his mom.