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Effect of Insulin on Yield and Composition of Milk of Dairy Cows

Animal Husbandry Department, Cornell University, Ithaca, New York

ABSTRACT

Short-acting insulin injections into lactating Holstein cows resulted in a decrease in milk production, milk lactose percentage, and blood glucose levels, and an increase in the percentage composition of milk fat and protein. The casein expressed as a percentage of the total protein remained the same during the insulin treatment as compared to the pretreatment period. Phlorizin caused a decrease in milk production, a slight increase in milk fat percentage, but no change in the milk protein percentage. Infusion of glucose with the insulin injections restored the milk yield to near-normal levels and caused the milk protein percentage to return to the pretreatment levels. The milk fat percentage remained elevated during the glucose infusion. Increases in milk fat and protein percentages during insulin treatment cannot be explained entirely by a decrease in the volume of milk.

This article has been cited by other articles:

				B. A. Corl, S. T. Butler, W. R. Butler, and D. E. Bauman Short communication: Regulation of milk fat yield and fatty acid composition by insulin. J Dairy Sci, November 1, 2006; 89(11): 4172 - 4175. [Abstract] [Full Text] [PDF]