The Protein Requirements of the Albino Mouse

however, that even though most of the recent nutrition studies with mice have been made with diets containing about 25 per cent casein, the protein concentration of the usual rations fed to breeding colonies has been con siderably less. Dawburn (3) has reported good growth with a diet contain ing 15.6 per cent casein. A careful reading of the published data has re vealed that both Wheeler and Beard based their conclusions on the results obtained with very few animals, and Dawburn did not include experiments with higher or lower protein concentrations for comparison with the figures obtained with the 15.6 per cent casein diet. For certain studies on the nu trition of the mouse we found it desirable to feed a diet containing minimal amounts of casein and it was important to know how far the protein could