J. Anim Sci.
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J. Anim Sci. 1953. 12:715-721.
© 1953 American Society of Animal Science
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Carotene and Vitamin A Metabolism in Cattle and Sheep on Phosphorus-Deficient Rations

Willis D. Gallup, O. O. Thomas, O. Burr Ross and C. K. Whitehair

Oklahoma Agricultural Experiment Station1

Abstract

Nine yearling steers, after depletion in phosphorus and vitamin A reserves, were given daily supplements of carotene equivalent to about 10 times their minimum requirement. Four of the steers were continued on the low-phosphorus ration and five which served as controls were given supplemental phosphorus. In confirmation of other work with cows, plasma carotene levels were consistently higher in the steers on the low-phosphorus ration. The average value at the end of the experiment was 119 mcg. percent for the low-phosphorus group and 76 mcg. for the controls. Plasma vitamin A values for these two groups were 17 and 22 mcg. percent, respectively. Decreased vitamin A storage in the liver of the phosphorus-deficient steers was indicated.

Results obtained with lambs in a similar experiment showed a different trend than that noted with cattle. The average vitamin A content of the plasma in the phosphorus-deficient lambs was 20.4 mcg. percent as compared to 18.2 mcg. in the controls. Also, vitamin A stores in the liver were greater in the phosphorus-deficient lambs, 13.2 mcg. per gram (fresh basis), than in the controls, 11.8 mcg. On the basis of available data, it seems a plausible suggestion that a species difference exists in the vitamin A response of cattle and sheep to phosphorus deficiency.

Footnotes

1 Departments of Agricultural Chemistry Research and Animal Husbandry.






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Copyright © 1953 by the American Society of Animal Science.