I have been breeding for rats for about three years now. My colony is quite large 11 racks 6 males to about 43 females per rack. I would say Derek (cfr) has the right idea. In removing females on the weekly cleaning, or daily checks. You can increase production size, and quality, along the life of your breeders. Reduced stress, and proper nutrition can be given with this method. I would say no matter the size of your colony, you can always achieve optimum production with this method. Figure your weekly needs from pinkie yup and adjust the number you keep in your colony. I would suggest keeping no more than 1 male to 4 females. GL

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