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Posted by FroggieB on May 01, 2003 at 21:19:17:
In Reply to: breeding rats and mice question posted by Sonya on May 01, 2003 at 15:58:26:
I had a mouse that produced large healthy litters well past a year (15-21 per litter). I finally culled her when she started to develop a huge tumor on her back leg. I kept some of her offspring and they were great breeders too although I haven't kept any of them as long as my original super-mom. So I have to agree that it depends on the female. Generally when litter size starts decreasing I cull them out.