Congrats! I've been pretty lucky - I've purchased four pregnant mice when picking up feeders and they've all been great mommas. The smallest litter I had was 7 and the largest was 14. Interestingly enough, after the initial head count, I leave them all alone and I always end up with one less than the initial count the next time I check (about a week later I do another head count).


I'm assuming the moms are culling the weakest ones out.

After these last two moms' litters are fed off, I'm seriously considering picking up a couple of nice young female rats and raise them for a few months and then get them a mate and try my hand at rat breeding.