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The utilization of the nitrogen of urea and ammonium bicarbonate by growing calves

University of Wisconsin

Abstract

This problem has been studied, especially in Europe, where protein concentrates are expensive. No attention, so far as we know, has been given to the problem in this country. The data from Europe are con-flicting, some investigators claiming that polygastric animals can utilise for protein building simple nitrogen compounds like urea or ammonium bicarbonate, while others claim that they cainot. The foreign experiments have been balance experiments of short duration, which are always open to criticism; or experiments where ammonia or urea has displaced some of the protein for milk production. Here again the protein levels were sufficiently high so that the animals probably were receiving suf' ficient protein without a need for the nitrogen coming from simple forms like urea or ammonium bicarbonate. A complete review of this subject has been made recently by Krebs (1) (K. Krebs, Biedermann's Zent. tier Ernahrung, Band 9, Heft 4/6, 1937) and in our paper no further references to the literature will be made.