THE INFLUENCE OF DIFFERENT DOSES OF A NEW FEED ADDITIVE IN RATIONS OF LACTING COWS ON CONTENT OF FATTY ON AMINO-ACIDS IN MILK

Abstract

The results of the experimental studies have shown that the introduction of the "KoreMix" feed additive into the diet of lactating cows had a positive effect on the chemical, amino acid and fatty acid composition of milk. At the same time, the dose of the obtained additive influenced the qualitative component composition of the cow's milk. So, in the milk from the cows fed with "KoreMix"  in doses of 8.10 and 12.0 grams per day, the fat content was higher by 0.11, 0.19 and 0.21%, respectively; protein by 0.06, 0.11 and 0.13%; casein by 0.05, 0.08 and 0.10%; and sugar by 0.05, 0.13 and 0.14%. Rennet coagulation was more intensive in milk from the cows in experimental groups by 1.63, 6.40 and 6.56 minutes, respectively. In comparison with milk from the cows that did not receive the additive, milk from experimental cows had higher content of essential amino acids by 2.65, 12.09 and 14.75%, respectively. In terms of the content of the nonessential amino acids, only the tendency of their increase in milk from the cows in experimental groups has been established. In milk from the cows in experimental groups, the amino acid index increased from 0.813 to 0.912, as the dosage of the additive increased. A similar trend was observed in the content of fatty acids in milk. In comparison with the control, the content of saturated fatty acids in milk from cows in Group III increased by 0.17%, monounsaturated by 2.57 and unsaturated by 1.84%. The rate of the fatty acids content increase in cow's milk has been found to slow down, as the doses of the feed additive increased. As the amount of the additive increased in the diets of the cows, the contents of butyric, butylacetic and stearic fatty acids did not change, and the contents of capric and linoleic fatty acids decreased.