J. Anim Sci.
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J. Anim Sci. 1966. 25:484-491.
© 1966 American Society of Animal Science
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Effects of Sulfur and Nitrogen Sources and Copper Levels on the Metabolism of Certain Minerals by Sheep

R. D. Goodrich1 and A. D. Tillman

Oklahoma Agricultural Experiment Station2, 3,, Stillwater

Abstract

A series of growth and mineral balance trials involving 141 individually-fed lambs were conducted to determine the effects of sulfur source (sulfate and elemental sulfur), nitrogen source (urea and purified soybean protein) and copper levels on growth, liver storage of copper and balance of nitrogen, sulfur, copper, phosphorus and calcium. As shown by data from balance trials and liver analyses, lambs fed purified soybean protein did not retain or store as much copper as did those fed urea. The addition of sulfur as sulfate decreased the retention and liver storage of copper.

Nitrogen digestion and retention in lambs fed soybean protein rations were significantly reduced by feeding 100 ppm of copper. The sulfate rations promoted the greatest sulfur digestibility, but because of large urinary losses the retention of sulfur was greatest in lambs fed elemental sulfur. Both urea and sulfate lowered the retention of calcium. Phosphorus retention was lowered by feeding 100 ppm of copper with sulfate rations.

Footnotes

1 These data represent part of a thesis submitted by the senior author to the Graduate School of Oklahoma State University in partial fulfillment of the requirements for the Ph.D. degree. Present address: Department of Animal Husbandry, University of Minnesota, St. Paul, Minnesota.

2 Department of Animal Science.

3 Approved by the Director.






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Copyright © 1966 by the American Society of Animal Science.