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The Utilization of Urea and Biuret as Sources of Nitrogen for Growing-Fattening Lambs¹

Michigan State College

Abstract

In a feeding trial involving fifty 75-lb. lambs, a 7.13 percent crude protein basal ration was fed. Adding either urea, biuret or crude biuret, or replacing part of the corn with soybean oil meal, significantly increased the average daily gain and feed efficiency of the lambs. No significant differences were noted among the lots fed the various supplemental nitrogen sources.

It is concluded that, under the conditions of this experiment, urea, biuret and crude biuret are satisfactory sources of supplemental nitrogen for growing-fattening lambs. In addition, biuret appears to be less toxic than urea when fed in large amounts.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1788.

² The data contained in this paper are a portion of the thesis presented by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy, School of Graduate Studies, Michigan State College, East Lansing.

³ Departments of Animal Husbandry and Agricultural Chemistry. This work was supported, in part, by a grant-in-aid from the Nitrogen Division, Allied Chemical and Dye Corporation, New York, N. Y.