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Posted by Sonya on May 01, 2003 at 15:58:26:
In Reply to: breeding rats and mice question posted by DenverTom on May 01, 2003 at 11:58:11:
:How old is a rat when she stops being a productive breeder?
It'll depend on genetics and diet and whether you are breeding back to back etc but largely I breed mice for 4-6 months and rats for a 6-9 months. But that is just an average. I have had some that reproduce great up to 6-8 months for mice and a year for rats.