Mouse, domestic (Mus domesticus) - Neonatal, <3 g: 64.2% Crude Protein, 17.0% Crude Fat.
Mouse, domestic (Mus domesticus) - Juvenile, 3-10 g: 44.2% Crude Protein, 30.1% Crude Fat.
Mouse, domestic (Mus domesticus) - Adult or >10 g: 55.8% Crude Protein, 23.6% Crude Fat.

Rat (Rattus norvegicus) - Neonatal, <10 g: 57.9% Crude Protein, 23.7% Crude Fat.
Rat (Rattus norvegicus) - Juvenile, 10-50 g: 56.1% Crude Protein, 27.5% Crude Fat.
Rat (Rattus norvegicus) - Adult or >50 g: 61.8% Crude Protein, 32.6% Crude Fat.


Source: http://www.rodentpro.com/qpage_articles_03.asp