According to the nutrient chart on rodent pro, juvenile rats 10-50 grams are crude protein 56%, fat 27%, adult mouse is 55% and 24% (approx). Calcium about 3% for a rat and 2% for a mouse. For me it depends on the animal-I feed my hognose mostly adult mice but the the rest of my collection is mainly on rats but moved up quickly in size. Something to think about anyways.
http://www.rodentpro.com/qpage_articles_03.asp
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