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  • 1 University of Agriculture and Technology Institute of Animal Nutrition and Feed Management Please ask the editor of the journal.
  • 2 University of Agriculture and Technology Institute of Animal Nutrition and Feed Management Please ask the editor of the journal.
  • 3 Academy of Agriculture and Technology Institute of Animal Nutrition and Feed Sciences Please ask the editor of the journal.
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When evaluating the effects of yeast culture (Saccharomyces cerevisiae1026) supplied with or without a vitamin premix and mineral bioplexes on some intermediates and end-products involved in the synthesis of milk constituents in 30 early-lactation Black and White Lowland cows, no significant differences were found in the glucose level, mineral contents and enzyme activities of the blood serum. The effect of yeast culture on the availability of minerals for milk synthesis depended upon the dynamics of degradation of mineral bioplexes in the rumen and the cows' mineral status. The insignificant increase found in blood total protein content and the simultaneous small differences in blood urea nitrogen (BUN) and milk urea nitrogen (MUN) values in cows supplied with the yeast culture were probably associated with a high ammonia incorporation into microbial protein in the rumen, which increased protein supply for milk protein synthesis and decreased the nitrogen loss.

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