Effect of fluidised dried yeast (Saccharomyces cerevisiae) supplementation on milk composition, somatic cell count and milk yield at different lactation stages in Polish Holstein-Friesian cows

. The nutrition of modern dairy cows is a crucial factor affecting milk yield, its parameters and production economics. Nutritional supplementation is often necessary to ensure that cows receive all the required proteins in their diet. The aim of the study was to analyse the impact of fluidised dried yeast ( Saccharomyces cerevisiae ) on daily milk yield, milk yield for all lactation stages, and udder condition. Milk samples were collected before the experiment, during a 4-week period of yeast supplementation, and 4 weeks after the experiment to analyse changes in milk composition and yield. The results demonstrated a significant positive effect ( P < 0.01) on daily milk yield at all stages of lactation, as well as improved udder condition, as evidenced by lower somatic cell counts in milk. Therefore, the results have confirmed that fluidised dried yeast can be a valuable component of the diet for high-yielding dairy cows. However, further analyses are necessary to determine the long-term influence of yeast supplementation on milk production and the overall health of cows.