One appropriate sized rat every 7-10 days. Don't push your animals to grow for the sake of breeding. He does look like he's got some good growth on him already and may very well go this season without any excessive feeding. Size is not all that matters and maturity will dictate when he is ready to breed. In the long run pushing animals too fast can have many ill effects, I've always though healthy adults produce healthy babies, Good Luck!

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