The implementation of the genetic potential of dairy productivity by the Holstein breed animals provides for the organization of their full-fledged feeding with the use of effective feed additives. The study presents the results of an experiment, the main purpose of which was to study the effect of a yeast probiotic on the milk productivity of first-time cows and the quality indicators of the products obtained from them. The experiment involved three groups of animals (control and two experimental) who received the same balanced diet. The composition of the diets of deep-bedded heifers and first-heifers of the first and second experimental groups included feed yeast of 20 g/head. The dosage was different per day, and only during the new year period (20 days after calving). In the first experimental group, it was 50 g/head, and in the second – 100 g/head. per day. It was found that the use of the additive had a positive effect on the amount of milk yields and the quality of milk. The daily milk yields of the first heifers of the experimental groups exceeded the same indicator of their peers by 8.4 and 13.8% (32.2 and 33.8 kg vs 29.7 kg). Reliable materials have been obtained on the positive effect of the fed probiotic on the content of protein, fat, and dry matter in milk by mass. From an economic point of view, yeast is also beneficial, since due to the increase in milk yields for each ruble of additional costs, 5.2 and 6.6 rubles of profit were obtained. Based on the research results, it was revealed that the dosage used in the second experimental group is the most effective
Keywords
first-calf cows, feed yeast, daily milk yield, physico-chemical composition of milk, biochemical parameters