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Adaptation to and Palatability of Urea, Biuret and Diammonium Phosphate as NPN Sources for Ruminants^{1, 2,}

Ohio Agricultural Research and Development Center, Wooster³

Abstract

In a feeding trial with lambs fed rations consisting of a 70:30 ratio of roughage to concentrate (40% chopped wheat straw, 30% chopped timothy hay, 15% ground shelled corn and 15% purified cornstarch), the addition of biuret, urea, or DAP + U resulted in low weight gains.

In a 72-day metabolism trial, adaptation to urea was indicated by increased nitrogen balance and percent biological value. The biuret-supplemented lambs failed to show evidence of adaptation in either nitrogen balance or percent biological value, but did show adaptation in the apparent biuret excreted. As the trial progressed, the amount of urinary apparent biuret decreased with a corresponding increase in urinary urea ammonia nitrogen. There was no indication of adaptation to DAP + U.

In a palatability trial with lambs, both urea- and SBM-supplemented rations were equally preferred over diammonium phosphate (DAP) or DAP + U. Diammonium phosphate plus urea was preferred over DAP. In all periods DAP was very unpalatable.

¹ Approved for publication as Journal Article No. 42–65 by the Associate Director of the Ohio Agricultural Research and Development Center, Woostef.

² This research was supported in part by a Grant-in-Aid from the Nitrogen Division, Allied Chemical Corporation, New York.

³ Department of Animal Science.

⁴ A mixture of diammonium phosphate and urea which contained 30% nitrogen by analysis.