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A yeast strain isolated from whey and named Candida LY 496 was grown continuously on crude sweet whey. The obtained biomass had a crude protein content of 47%. The amino acid composition was determined by high performance liquid chromatography (h. p. 1. c.). All essential amino acids were present and among them lysine waspredominant (11.8%). The total nucleic acids of the biomass was 6.4%. Lipids represented 5% and the fatty acids 2% of the dry matter; 75% of the fatty acids were unsaturated, and linoleic acid constituted only 1 % of the total fatty acids. Niacin and vitamin B, were the most abundant vitamins of the B group. Therefore Candida L Y 496 biomass could be incorporated in animal food intakes.