The study assessed an influence of broiler chicken feeding mixtures characterized by a different share of brewer’s yeast on post-slaughter effects of birds and the quality of their meat. It was found that the control group chickens and the birds fed mixtures in which 11 and 18% soy bean protein was replaced with yeast protein obtained better slaughter performance, better musculature, and lower carcass fatness than the birds which was receipting mixtures with more yeast. An introduction of yeast in mixtures increased the crude fat content in both breast and thigh muscles. An application of mixtures with a higher share of yeast protein unfavourably influenced the composition of fatty acids of meat lipid fraction, mainly the amount of PUFA. Mixtures including brewer’s yeast beneficially influenced the flavour attributes of red and white meat.

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