Review of international and Polish literature concerning the application of nutrient yeasts and products of yeast origin in feeding of monogastric animals and ruminants with the consideration of chemical composition and nutritive value, is discussed in the present paper. Basing on the results of own studies, nutrition properties of yeasts enriched with selenium, chromium and zinc with the consideration of their bioavailability to livestock (poultry, swine) are presented. The authors also elaborated a method of waste-less enrichment of yeasts with iron, manganese and copper with the use of the culture Saccharomyces cerevisiae and whey. Currently, there is conducted a research on their application in livestock nutrition.

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