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Effect of Quantity and Source of Dietary Nitrogen on the Utilization of the Hydroxy Analogues of Methionine and Glycine by Chicks¹

Department of Poultry Husbandry, University of Wisconsin, Madison

1. The hydroxy analogues of methionine and glycine as supplements in low-protein chick diets failed to support growth equivalent to the alpha amino compounds (DL-methionine and glycine).

2. Additions of nitrogen in the form of urea or diammonium citrate to the MHA diets caused a marked increase in chick growth response over MHA alone. Urea, added to the sodium glycolate-supplemented diets, increased chick gains over sodium glycolate alone.

3. Feed efficiency of chicks receiving MHA and sodium glycolate-supplemented diets was poorer than that of chicks receiving diets supplemented with DL-methionine and glycine. Additions of urea or diammonium citrate to MHA or sodium glycolate-supplemented diets improved feed efficiency.

4. Chicks appeared to be more tolerant of dietary urea and diammonium citrate in the presence of MHA than in the presence of DL-methionine.

5. The increased chick growth response to dietary urea or diammonium citrate is believed to be the first such observation in chick experiments.

² Wisconsin Alumni Research Foundation fellow.

Manuscript received 5 December 1956.