Влияние антиоксидантов, энергокорма и йода на адаптацию коров к высоким температурам среды, молочную продуктивность и воспроизводство

Abstract

Two studies were conducted. In the 1st there are 3 groups of black-and-white cows of 9 heads each. One was the control, received the main diet (BR), the 2nd (experimental 1) received energy feed (EF) containing 23.6 MJ/kg of metabolizable energy in 150 and 300 ml in addition to the EF, the 3rd (experimental 2) additionally received 0.5 and 1.5 g of organic iodine (OI) and 1 g of dihydroquercetin (DHQ) head/day, respectively, during the dry and lactation periods in the spring and summer months, characterized by thermoneutral and high summer temperatures. Milk productivity and milk quality in cows during the spring-summer period had differences between groups. In cows of the control group, on average, over 5 months of lactation, the average daily milk yield was 22.7 kg with a fat content of 3.79% and protein of 2.94%: in cows of the 1st experimental group 21.6, 3.90, 3.02 and the second experimental group 20.8, 3.89 and 3.04, respectively, with a slightly higher average daily milk yield in cows of the control group by 1.1 and 1.4 kg compared to. cows of the 1st and 2nd experimental groups, their fat and protein content in milk was lower by 0.11 and 0.08 % pp in relation to the cows of the 1st experimental group and by 0.10 and 0.10%, respectively, compared to cows of the 2nd experimental. As a result, the content of total dry matter in milk was higher in cows of the experimental groups, which amounted to 12.70 and 12.54% compared to 12.15 % in the control group. The second study examined the effects of antioxidants on reproductive performance in cows. For the experiment, 3 groups of black-and white cows aged 3-5 years, 15 heads each, were formed, the cows of the 1st group were control. Cows of the 2nd and 3rd groups were intramuscularly injected with 20 ml of the selenium preparation Gabivit-Se with the addition of 250 and 500 mg of DHQ, respectively, twice with an interval of 7 days. Treating cows with antioxidants significantly improved the physiological, biochemical and reproductive performance of cows. Treatment of cows with Gabivit-Se + 500 mg DHQ was more effective.