[Digestion of incoagulable proteins during the early postnatal period of development]

Substitution of casein by proteins of milk serum or by bovine blood serum albumin in the diet of 15 days old rats, maintained on artificial food, led to a 2-3-fold increase in the rate of transport of alimentary protein from stomach and to a corresponding elevation in content of nitrogen containing material in chymus of the small intestine. Distinct activation of trypsin and chymotrypsin as well as an increase in concentration of low molecular products of the protein proteolysis were found in the chymus of small intestine.