Productive and biological justification of the efficiency of energy supplements in the technology of cattle growing

The purpose of the research was to study the effectiveness of the preparations "Milkstar" and "Rumipower" in the diets of black-and-white cows. The objectives of the study included: analysis of the productivity of cows, study of clinical and physiological parameters of the organism and feeding behavior of animals, analysis of reproductive functions, determination of the economic efficiency of the investigational drugs. The objects of the study were black-and-white cows at the age of 3rd lactation. For the study, 30 clinically healthy cows were selected, formed according to the principle of analog pairs into three groups. The cows of the first and second experimental groups were kept on a ration with the use of the energy supplement "Milkstar" and "Rumipower" in the amount of 200 g per head per day for a month, respectively, the animals of the control group received a ration without the supplement. Scientific and economic experience showed that the gross milk yield of the first group increased by 15.3% for 60 days of the experience, from the second group - by 22.5%. The duration of the service period in the cows of the experimental groups was significantly lower than in the control group by 20.4 and 25.8%, which contributed to a reduction in the interbody period and an increase in the coefficient of reproductive capacity of cows from 0.92 to 0.97 and 0.96, respectively. Due to the higher milk productivity of animals, feed costs in groups 1 and 2 are offset by additional revenue from the sale of milk, which makes it possible to receive income per 100 cows in the amount of 172,500 rubles from the first group and 313,800 rubles from the second. Based on the data obtained, it was concluded that the use of energy supplements had a positive effect on all the studied indicators. In addition, "Rumipower" feeding showed the best results in terms of economic efficiency.