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The Relative Efficiency of Urea as a Protein Substitute in the Ration of Ruminants^1,2,

University of Illinois³

Abstract

Since the publication of Weiske, Schrodt and von Danger (1879), indicating the possible importance of non-protein nitrogenous compounds as protein substitutes in ruminant nutrition, corivincing evidence has been offered that such compounds are so utilized by ruminants, in all likelihood through the mediation of the flora and fauna of the rumen. Recent contributions of this nature, relative to urea, have been reported by Wegner, Booth, Bohstedt and Hart (1940) and Harris and Mitchell (1941a, 1941b ).

However, there is very little irfformation in the literature concerning the efficiency with which the ruminant utilizes dietary nitrogen in non-protein form. Harris and Mitchell (1941a) compared the biological values of urea and casein nitrogen for sheep at maintenance and sub.maintenance levels, and secured some data on the relative utilization of these two forms of nitrogen in covering the requirements of growth. This paper will report the results of nitrogen balance experiments on growing lambs, designed to compare the utilization of the nitrogen of urea, soybean oil meal and casein.

¹ This investigation was made possible by the donation of funds to the University of Illinois by the E. I. DuPont de Nemours Company.

² A preliminary report of this investigation was presented before the Division of Agricultural and Food Chemistry of the American Chemical Society at the meeting at Atlantic City on September 8–12, 1941.

³ Animal Nutrition Division, Urbana, III.