J. Anim Sci.
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J. Anim Sci. 1951. 10:251-256.
© 1951 American Society of Animal Science
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Comparative Effect on Vitamin A Metabolism in Sheep of Urea, Soybean Oil Meal and Cottonseed Meal as Sources of Protein1

Willis D. Gallup, H. M. Briggs2, L. S. Pope and James Tucker

Oklahoma Agricultural Experiment Station3

Abstract

Comparable groups of sheep which had been partially depleted in their stores of vitamin A were fed low-carotene rations containing soybean oil meal, cottonseed meal and urea as the principal sources of nitrogen. In different experiments they were given supplements of high-potency codliver oil, prairie hay and a carotene concentrate as sources of vitamin A or carotene. Vitamin A was determined periodically in the blood. Its storage in the liver was determined at the beginning and end of the supplement feeding period.

The marked efficiency of fish liver oil as compared to carotene supplements in promoting storage of vitamin A in the liver was demonstrated. Although in each experiment there were differences in blood and liver-vitamin A values related to differences in the source of nitrogen in the basal ration, these differences were not of statistical significance.The trends of results indicated greater vitamin A storage when cottonseed meal was fed than when soybean oil meal was the protein supplement. Urea was without effect on carotene and vitamin A metabolism as measured by the plasma and liver values.

Footnotes

1 This investigation was supported in part by a research grant from E. I. du Pont de Nemours and Company, Inc.

2 Present address: University of Wyoming, Laramie, Wyoming.

3 Departments of Agricultural Chemistry Research and Animal Husbandry.






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Copyright © 1951 by the American Society of Animal Science.