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The objective of the study was to examine the effects of feeding high yielding dairy cows dried brewers yeasts on their metabolic status.In experiment 1,we fed the product LEIBER-BT (bacteria Saccharomyces cerevisae which consists of 40% brewers yeast and 60% draff) and in experiment 2,we fed LEIBER-VIKING-PRO (40% brewers yeast and 60% DDGS).