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Interrelationships between Carotene from Artificially Dehydrated Alfalfa and Vitamin A from a Dry Carrier When Fed Simultaneously to Holstein Calves¹

Animal Industries Department, Storrs (Conn.) Agricultural Experiment Station

Geoffrey Beall

Statistics Department, University of Connecticut, Storrs

ABSTRACT

With the elucidation of the chemical structure of carotene and vitamin A, their interrelationships have become more readily understood. There have, however, been several reports which indicated that the relationship is not as simple as the chemical structures might indicate. Using primarily plasma carotenoids and vitamin A as criteria, several workers have investigated the effect of massive doses of either compound when fed with the other to dairy animals. Large doses of vitamin A have been reported to suppress plasma carotenoid levels both in the calf ((7, 10, 15, 18) and in older animals (3, 8, 16, 21, 23). A similar suppression of the carotenoids in milk following large doses of vitamin A to milking animals has been observed (3, 9, 11, 14). In none of these studies was the intake of both sources of the vitamin controlled simultaneously nor was an attempt made to give quantitative expression to the results.

With the synthesis and commercial production of crystalline vitamin A and its incorporation into a dry carrier, its use by f eed manufacturers has increased considerably.

¹ This study was supported in part by funds provided by the Chas. M. Cox Company, Boston, Mass., and the Big-Y-Foundation, Norwich, Conn., and is based in part upon a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy to the Graduate School of Cornell University. The senior author gratefully acknowledges the financial assistance of the Charles H. Hood Dairy Foundation during his graduate program. A preliminary report of this study was given at the 1955 Annual Meeting of the American Dairy Science Association.

² Present address: Chas. M. Cox Co., Boston, Mass.