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Protein Production in the Bovine. Comparison of Daily Protein, Fat, and Milk Production During the Entire Lactation Period¹

Laboratory of Biochemistry, Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

The production level of the milk proteins was evaluated during the entire lactation period of several cows and compared to the production of total milk and fat. In contrast to the normal attainment of maximum daily production of milk and fat after about the first month, the total amount of protein produced per day tended to be at a maximum on the day of parturition and either remain constant or decrease during this time. Maximum casein production was reached in but a few days; however, the simultaneous decrease in serum protein output tended to maintain the total protein production in the first few days or to decrease it. Large variations were found to occur during the lactation periods in the ratio of protein to fat production.

¹ Supported in part by a grant from the Rockfeller Foundation.