If he's 2200 grams, I would guess you need to step up to a small rat or probably 3-4 adult mice. Like I said though, at adult ages, the whole 10-20% weight measurement goes out the window. That applies more to babies as they eat much more often and are growing like weeds. Adults slow down a lot so you need more of a maintenance feeding schedule vs a growing feeding schedule. At Big Cheese Rodents, their adult mice weigh between 19-29 grams while their small rats weigh between 50-89 grams to give you an idea.
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