J. Anim Sci.
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J. Anim Sci. 1964. 23:47-53.
© 1964 American Society of Animal Science
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Influence of Urea upon Vitamin A Nutrition of Ruminants

G. S. Smith, S. B. Love1,2,, W. M. Durdle2, E. E. Hatfield, U. S. Garrigus and A. L. Neumann

University of Illinois3, Urbana

Abstract

Liver storage of supplemental vitamin A was lower than expected in sheep fed for 97 days a purified diet containing urea as the only appreciable source of nitrogen. Subsequently liver storage of vitamin A remained below normal in these sheep when fed a semipurified diet containing 12% soybean protein. The addition of urea as 5% of the diet containing 12% soybean protein decreased the liver concentration of vitamin A, apparently by enlargement of the livers, but did not change the total liver content of vitamin A. In another experiment urea was fed as 5% of the ration to sheep on a natural diet containing approximately 12% natural protein without any apparent effect upon liver size or upon vitamin A nutrition in terms of either expenditure or storage of vitamin A or of carotene utilization.

Steers depleted of liver vitamin A stores and treated with vitamin A palmitate during a 56-day fattening period performed as well and exhibited no effect upon vitamin A status when urea was used as the source of supplemental nitrogen in place of soybean meal. Liver storage of vitamin A was greater in steers treated with a single intramuscular injection of vitamin A palmitate in polysorbate than in steers fed an equal amount in daily dosage during the 56-day period.

Footnotes

1 Present address: High Plains Research Foundation, Plainview, Texas.

2 The data were taken, in part, from theses submitted by S. B. Love and W. M. Durdle to the faculty of the University of Illinois in partial fulfillment of the requirements for the degrees of Master of Science and Doctor of Philosophy respectively.

3 Department of Animal Science.






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Copyright © 1964 by the American Society of Animal Science.