Evaluation of Diammonium Phosphate as a Source of Nitrogen for Ruminants

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Abstract
Urea and diammonium phosphate were compared with respect to toxicity to lambs, effect on blood NH3-N in lambs and steers, and retention of N by lambs. On an equivalent nitrogen basis, doses of diammonium phosphate approximately 2.5 times those of urea were required to produce adverse effects in lambs. Blood NH3-N increases were significantly lower following treatment with diammonium phosphate 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 administration of diammonium phosphate was very slight. Twenty-four-hour nitrogen excretion trials and 5-day nitrogen balance studies showed no significant difference in the retention of N of the 2 compounds by lambs.

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