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Department of Poultry Science, Washington State University, Pullman, Washington
Studies on the effect of feeding semipurified diets containing Torula or dried brewers' yeast as a major source of protein on the expression of vitamin E deficiency in Single-Comb White Leghorn hens are reported. Hatchability of fertile eggs was markedly lowered by feeding of both diets. Mortality of offspring was markedly increased by using Torula yeast, but not with brewers' yeast. Two antioxidants had no effect on chick viability. Addition of 1 ppm of selenium failed to improve either hatchability or chick viability.
2 A preliminary report of some of this work was presented before the American Institute of Nutrition, 21st Annual Meeting, 1957, Chicago.
Manuscript received 11 April 1960.