The effectiveness of the use of feed yeast in the cultivation of repair heifers

The paper contains the results of scientific research on the effectiveness of the use of feed yeast in the diets of the Holstein repair heifers during the dairy and transitional periods. This probiotic is produced on the basis of live strains of dairy yeast, which indicates its safety for both humans and animals. The aim of the scientific and economic experience is to assess the effect of the tested product on the dynamics of live weight and gains of breeding heifers, the profitability of their cultivation at an early age. An increase in the amount of the test additive contributed to a better digestibility of hay and feed mixture, which led to an increase in the nutritional value of the diets in terms of metabolic energy, organic and mineral substances, and vitamins. In the experiment, two dosages of the introduction of feed yeast into the daily diets of animals of the experimental groups were studied – 4 and 8 g. The second was recognized as the most effective of them according to the results of the experiment. When feeding the main diet with the inclusion of 8 g of yeast daily, a significant (p ≥ 0.95) increase in the live weight of growing heifers by 9.6% (from 181.0 to 198.3 kg) and an increase in average daily gains over an average of six months from 786 to 882 was obtained. The positive effect of the probiotic studied on animal growth predetermined the receipt of additional profits in the amount of 2,942 rubles. The highest level of profitability of the resulting increase (15.6%) was established when using feed yeast in the amount of 8 g per head per day.