INFLUENCE OF MINERAL-VITAMIN PREMIX ON INDIVIDUAL LINKS OF METABOLISM AND PRODUCTIVITY OF COWS

The recipe of mineral-vitamin premix, made on the basis of salts of mineral elements (Cuprum, Zinc, Cobalt, Iodine and Selenium) and fat-soluble vitamins (A and D), which are deficient in the Pre-Carpathian zone, has been developed and its influence on individual metabolic links and productivity of dairy cows has been investigated. The experiment was conducted on two groups of highly productive cows of Simental breed, analogues in origin and productivity in the summer-pasture period of keeping. The main diet for animals of both groups consisted of pasture grass, mowed mass of cereal-bean mixtures of green conveyor, hay cereal-mixed grass, molasses and standard feed K 60-32-89 with premix P 60-5M. The experimental group received a similar amount of this feed, but with an experimental mineral-vitamin premix. It was found that in the herbal-concentrate type of diet in the control group, the deficiency of Cuprum, Zinc, Cobalt, Iodine and Selenium was 16.6, respectively; 13,2; 6,9; 26,2; 51.8%, and the deficiency of vitamins A and D - 60.0 and 16.3%. Introduction of mineral-vitamin premix into the compound feed, which contained salts of the specified elements deficient for the Pre-Carpathians, made it possible to better balance the rations according to the mineral part, which significantly influenced both the intensity of metabolic processes in the rumen and blood, and the milk productivity of cows and the quality of milk. In particular, the positive effect of its feeding on the level of fermentation, the activity of enzyme systems and the intensity of synthetic processes in the rumen of cows of the experimental group was noted. The study of the hematological picture showed a tendency to increase the level of red blood cells and hemoglobin in the blood of cows of the experimental group, an increase in the concentration of nitrogen fractions and urea (P < 0.01). Analyzing the results of research, it can be argued that ensuring the optimal level of mineral-vitamin nutrition led to an increase in the intensity of metabolic processes in the body of animals and therefore contributed to an increase in dairy productivity. The average daily yield of natural milk in the experimental group for 90 days of the accounting period was 21.6 kg and was 10.8% higher than in the control (19.5 kg). The chemical composition of milk of cows that received a mineral-vitamin premix as part of the feed was preferable. It showed a probable increase in the content of dry matter, total protein (P < 0.05) and calcium (P < 0.02).