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A Comparison of the Vitamin A Potency and Carotene Content of Different Types of Silage¹

New Jersey Agricultural Experiment Station, New Brunswick, New Jersey

ABSTRACT

Carotene analyses and vitamin A bioassays have been carried out on 9 samples of silage, including regular corn silage, crops ensiled with molasses, and by the A.I.V. procedure. In every case the bioassays showed a higher vitamin A potency per unit of carotene than was obtained on a sample of International Standard Carotene, but the differences were of such magnitude that the carotene analysis may be taken as a reliable index of vitamin A potency. One International Unit (0.6 microgm.) of carotene in silage was found to be equivalent to 1.8 U.S.P. units of vitamin A.

¹ Journal Series paper of the New Jersey Agricultural Experiment Station, Departments of Agricultural Biochemistry and Dairy Husbandry. Presented before the Division of Biological Chemistry of the American Chemical Society at Rochester, N. Y., September, 1937.

² Department of Agricultural Biochemistry.

³ Department of Dairy Husbandry.