J. Anim Sci.
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J. Anim Sci. 1975. 41:635-640.
© 1975 American Society of Animal Science
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Vitamin a Status of Ewes and Lambs Grazing Nitrogen Fertilized Orchardgrass Pastures1,2,

F. P. Horn3, R. L. Reid and G. A. Jung4

West Virginia University, Morgantown 26505

Abstract

Experiments described were conducted to define the vitamin A status of ewes and lambs grazing orchardgrass fertilized at various levels of N or N plus micro-elements. Four fertilizer treatments (56 kg N/ha; 168 kg N/ha; 504 kg N/ha; 504 kg N/ha + Co, Cu, Mo, Zn and S) were applied to replicated hay and pasture plots of Potomac orchardgrass on a Gilpin silt loam soil. Ewe lambs were allocated randomly to fertilizer treatment groups and maintained on pasture and hay from 1967 to 1971.

Forage nitrate and carotene levels increased with increasing levels of N fertilizer, but fertilizer level did not affect ewe blood carotene, blood vitamin A or liver vitamin A levels. Overall average values were .06% NO3-N and 127 mg carotene per kilogram of forage DM, 12.3 meg carotene and 26.7 meg vitamin A per 100 ml of blood, and 92.5 meg vitamin A per gram of fresh liver.

Footnotes

1 Published with the approval of the Director of the West Virginia Agricultural Experiment Station, as Scientific Paper No. 1348.

2 The authors wish to express their appreciation to E. C. Townsend for advice on statistical analysis of the data. The study was carried out with financial support from HEW, PHS Grant No. ES 00150-02; microelement fertilizers were supplied by TV A.

3 Present address: Agricultural Research Service, U. S. Department of Agriculture, Fort Reno Livestock Research Station, El Reno, Oklahoma 73036.

4 Present address: U. S. Regional Pasture Research Laboratory, U. S. Department of Agriculture, University Park, Pennsylvania 16802.






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Copyright © 1975 by the American Society of Animal Science.