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Nutritional Value of Yeast Protein to the Rat and the Chick

Western Regional Research Laboratory, Albany, California¹

1. Brewers' yeast and torula yeast grown on molasses have been fed as the principal or only source of protein in the diet of rats during the period of rapid growth. The same yeasts and also a torula yeast grown on prune juice were fed to chicks. At the levels fed, and in comparison with equivalent amounts of relatively complete proteins, each of the three yeast preparations contained an inadequate amount of methionine for optimum rate of growth.

2. This inadequacy could be corrected by the addition of methionine or methionine-rich protein to the diet.

3. Cystine corrected the deficiency to a limited extent.

4. Yeasts at relatively high levels and over limited periods did not appear to be toxic.

Manuscript received 16 January 1945.