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The Effect of Interruption of Milking on the Carotene and Vitamin A and Proximate Composition of Milk and on the Calcium Content of Blood Serum¹

Animal Industries Department and Animal Diseases Department, Storrs Agricultural Experiment Station, Storrs, Connecticut

ABSTRACT

The effect of interruption of milking for a 10-day period during lactation on the carotene, vitamin A, and proximate composition of milk and on the calcium level of blood serum has been studied for 18 cows. The data indicate that interruption of milking results in significant increases in the concentration of carotene and vitamin A. With the exception of lactose, the proximate constituents also increased in concentration; lactose content decreased. The total amount of these nutrients secreted for the first 3 days after interruption was significantly lower for the proximate constituents, but no appreciable differences were noted for carotene and vitamin A. Interruption of milking, resulted in a significant elevation of blood serum calcium during the period of interruption.

¹ This work was supported in part by the Big-Y-Foundation, Norwich, Conn, and Chas. M. Cox Co., Boston, Mass. It is part of a thesis presented by D. N. Mercer to the Graduate School