EN
The effect of Saccharomyces cerevisiae live cells and S. cerevisiae culture applied during pre- and postpartum periods on production performance, and the metabolic profile in 50 multiparous Holstein cows was measured. The following diets were applied: control diet; control diet + 7 g of S. cerevisiae live cells for 3 weeks pre-partum and 10 weeks postpartum; control diet + 7 g of S. cerevisiae live cells for 3 weeks prepartum; control diets + 60 g of S. cerevisiae culture for 3 weeks prepartum and 10 weeks postpartum, and control diet + 60 g of S. cerevisiae culture for 3 weeks prepartum period. Blood samples were taken 7 d before calving and on days 14 and 56 of lactation and analysed for glucose, non-esterified fatty acids, triglycerides, cholesterol, GGT, and AST. Both preparations had no significant effect on the milk yield and dry matter intake. Concentrations of serum blood metabolites and liver enzymes activity were similar between groups, although glucose tended to be higher on the 14th d of lactation in both groups supplemented with S. cerevisiae culture, while S. cerevisiae live cells elevated serum glucose on the 56th d of lactation in both groups. Two yeast S. cerevisiae preparations were not significantly beneficial to any production or blood parameters in the transition period of dairy cows.