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Prepartum Milking. I. The Effect of Prepartum Milking on Some Blood Constituents of the Cow¹

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

ABSTRACT

The effect of prepartum milking for 10 days prior to the calculated parturition date on the total hemoglobin, serum calcium and inorganic phosphorous, plasma carotene and vitamin A, and mammary and umbilical edema has been studied in 43 cows. Secondarily, the effect of feeding daily one million USP units of vitamin A for 30 days prior to the calculated parturition date was measured.

Prepartum milking had no significant effect on the changes occurring at parturition in the several blood constituents, nor did prepartum milking affect significantly the mammary and umbilical edema present at parturition. The prepartum feeding of supplementary vitamin A caused a significant decrease in plasma carotene and increase in plasma vitamin A.

¹ This work was supported in part by the Big-Y-Foundation, Norwich, Conn, and Chas. M. Cox Co., Boston, Mass.