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Evaluation of Diammonium Phosphate as a Source of Nitrogen for Ruminants^{1, 2,}

University of Arizona, Tucson

Abstract

Urea and DAP were compared with respect to their toxicity to lambs, their effect on blood NH-₃N in lambs and steers, and retention of their nitrogen by lambs. Much higher nitrogen equivalent doses of DAP than of urea were required to produce adverse effects in lambs. Blood NH₃-N increases were significantly lower following treatment with DAP than with urea, in both lambs and steers. Administration of urea to lambs was followed by a sharp rise in rumen pH, but the rise in pH following DAP was very slight. Twenty-four-hour nitrogen excretion trials and 5-day nitrogen balance studies showed no significant difference in the retention of nitrogen of the two compounds by lambs.

¹ Arizona Agricultural Experiment Station Technical Paper No. 670.

² This research was supported in part by funds and materials from the Shell Chemical Company.

³ Department of Animal Science.