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Whey Yeast Rat-Feeding Study

Western Regional Research Laboratory^,1, Albany 10, California, and Eastern Regional Research Laboratory^,2, Philadelphia 18, Pennsylvania

ABSTRACT

The conversion of whey waste into a potential food or feedstuff by fermentation with Saccharomyoes fragilis has been accomplished by Wasserman et al. (2, 3). This raises the question as to whether any undesirable effects would be encountered from the ingestion of such a yeast. Recently, Bender and Doell (1) reported the absence of any harmful effects on the rat when three different food yeasts were fed at dietary levels of 21% for four to six months.

The biological value of the protein of whey yeast has been evaluated by the Wisconsin Alumni Research Foundation (personal communication). During a 4-wk period, the protein efficiency ratio decreased from 2.8 to 1.5 when rats were fed a diet containing 9% protein, contributed entirely by whey yeast in place of casein, and the average weight gain decreased from 100.3 to 50.4 g.

In this note we report the results of feeding whey yeast and brewers' yeast to rats on two different diets for a period of 90 days.

¹ Western and Eastern Utilization Research and Development Divisions (respectively), Agricultural Research Service, U. S. Department of Agriculture.

² Western and Eastern Utilization Research and Development Divisions (respectively), Agricultural Research Service, U. S. Department of Agriculture.