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Effect of Initial Vitamin A Status on Subsequent Response of Holstein Calves to Carotene Intake from Artificially Dehydrated Alfalfa¹

Animal Industries Department

C. F. Helmboldt and E. L. Jungherr

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

ABSTRACT

Thirty-six male Holstein calves, 89 ± 9 days of age and partially depleted of their vitamin A stores to an average of 8.9 ± 4.0 per 100 ml. of plasma, were fed one of three initial carotene intakes, 100, 300, or 900 per lb. live weight per day, for a 6-wk. period, and thereafter, one of four final carotene intakes, 20, 60, 180, or 540 , for a 12-wk. period. Both plasma carotenoids and vitamin A concentrations were found to respond to current carotene intake, with the more rapid changes observed when the carotene intake was changed from a high to a low intake, as compared with a low or a medium to a high. The initial vitamin A status, as indicated by plasma concentrations at the termination of the initial carotene intake period, influenced the response of plasma and liver vitamin A concentration observed for the final 12-wk. carotene intake period, in that greater carotene intakes were required to obtain a desired response in the case of the lower initial plasma vitamin A concentrations. Based on calculated tocopherol intakes, artificially dehydrated alfalfa resulted in increased plasma and liver concentrations of this vitamin.

¹ This study was made in part with grant-in-aid funds provided by the American Dehydrators Association, Kansas City, Mo., the Chas. M. Cox Co., Boston, Mass., and the Big-Y-Eoundation, Norwich, Conn.

² Present address: U. S. Fishery Products Lab., Ketchikan, Alaska.

³ Present address: Chas. M. Cox Co., Boston, Mass.