J. Anim Sci.
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J. Anim Sci. 1968. 27:557-561.
© 1968 American Society of Animal Science
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Urea-Nitrate Interrelationships in Sheep under Feedlot Conditions1

D. W. Hoar, L. B. Embry, H. R. King and R. J. Emerick

South Dakota Agricultural Experiment Station2, Brookings

Abstract

Two experiments were conducted to study nitrate-urea interrelationships, and a third was conducted to compare the utilization of soybean meal, urea and nitrate when added to a low-protein ration. All experiments utilized lambs fed corn and corn silage rations under feedlot conditions.

In two experiments, sodium nitrate (2.5% of ration, air-dry basis) tended to reduce weight gains when fed in rations with soybean meal (7%, air-dry basis) but it had only a slight effect in rations with an equivalent amount of crude protein from urea (1%, air-dry basis) where gains were already below those of the lambs fed soybean meal. In these instances, lambs fed urea gained 16.5 to 19.5% less than lambs fed soybean meal. No evidence was obtained to support a nitrate-urea inter-relationship. In a third experiment, the crude protein content of an 8.04% protein ration was increased to 9.54% using soybean meal, urea or sodium nitrate to furnish equivalent amounts of nitrogen. Under these conditions the three nitrogen sources were utilized equally well as sources of crude protein.

Footnotes

1 Published with approval of the Director as Publication No. 785 of the Journal Series, and supported in part by Public Health Service research career program award No. 1-K3-AM-28, 621-01 from the Institute of Arthritis and Metabolic Diseases.

2 Departments of Experiment Station Biochemistry and Animal Science.






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Copyright © 1968 by the American Society of Animal Science.