J. Anim Sci.
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J. Anim Sci. 1964. 23:669-673.
© 1964 American Society of Animal Science
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Vitamins A and E in Steer Fattening Rations on Pasture1

H. L. Chapman, Jr., R. L. Shirley2, A. Z. Palmer2, C. E. Haines, J. W. Carpenter2 and T. J. Cunha2

Florida Agricultural Experiment Station,,3 Belle Glade

Abstract

A series of three experiments were conducted to determine the value of vitamins A and E when added to concentrate mixtures for steers on pasture. Levels of 25,000 I.U. of vitamin A significantly (P<.01) increased rate of gain of steers during two winter experiments but not during a summer trial. Vitamin E significantly increased weight gains during one winter trial but not the other. Neither vitamin A nor E had a significant effect upon steer performance during a summer feeding trial. The response to the vitamins appeared to be related to the level of carotene and KNO3 in the forage. Supplemental vitamin A or E increased vitamin A and copper in liver tissue. There was less growth response to vitamin A when it was fed in combination with vitamin E. The relationship of other nutrients, such as copper, may be a factor in the effect of supplemental vitamins A and E.

Footnotes

1 Florida Agricultural Experiment Stations Journal Series No. 1792.

2 Address: Department of Animal Science, University of Florida, Gainesville.

3 Everglades Experiment Station, Belle Glade, Florida. Appreciation is expressed to E. D. Harris for assistance with statistical analyses of the data and to others who assisted in these studies. The vitamins A and E were furnished by Distillation Products, Inc., Rochester, N. Y. The vitamin A acetate was a free-flowing, plasticized gelatin product, with a guaranteed potency of 250,000 U.S.P. units per gram. The vitamin E was a dry, free-flowing, D-alpha tocopherol acetate in a soybean meal carrier with a guaranteed potency of 20,000 I.U. per pound.






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