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Appl Environ Microbiol. 1965 November; 13(6): 876-881
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Production of Egg Yolk Coloring Material by a Fermentation Process¹

Laboratory of Microbiology, Department of Food & Biotechnology, Technion—Israel Institute of Technology, Haifa, Israel

ABSTRACT

Rhodotorula mucilaginosa was cultivated in a yeast propagator, for the production of biomass and carotenoids. A spray-dried preparation of the yeast was incorporated into the diets of laying chickens for the promotion of egg yolk color. Several aspects of the effect of media on growth and carotenogenesis of pigmented yeast were examined. Addition of 1 to 2% of Rhodotorula yeast to the feeding mixture considerably improved egg yolk color. The possibility of using carotenogenic yeasts as a feed supplement is suggested.

¹ This work is part of a thesis submitted by Y. Schwartz to Technion—Israel Institute of Technology in partial fulfillment of the requirements for the M.Sc. degree.