[Change in the proteins in the colostrum of a cow during the 1st hours after calving].

Studied were the changes taking place in the protein content of the colostrum of cows during the first six hours following calving. The protein fractions were identified by the method of disk polyacrylamide electrophoresis. It was established that the amount of the total protein dropped with the increase in the secretion time. Changes were found to take place in the gamma-globulin fractions, the casein, and the soluble proteins.