Keywords: dairy cows, essential amino acids, methionine, lysine, milk production, nutrient conversion
The article presents the results of a study of the effect of proteins protected from digestion in the rumen and essential amino acids (methionine and lysine) on milk production and milk quality of milk production direction cows and nutrient conversion.
In a study of two groups per12 heads of lactating first-calf cows the actual feed intake, milk productivity, and milk quality indicators — fat and protein — were studied using diets with protected from digestion in the cows rumen proteins and essential amino acids. The positive impact on productivity and milk quality of high-energy protein supplement TEP-mix, which contains protected from digestion in the rumen protein and essential amino acids (lysine and methionine)in cows feeding was proven. It was found that the use of a high-energy protein supplement TEP-mix with a protein protected from digestion in the rumen contributed to an increase of methionine amount in the diet of highly productive cows in the first half of lactation by 24.3 % compared with the existing norms for cattle feeding and lysine by 14.2 %, which in turn has a positive effect on milk productivity and quality. So, for 126 days of high-energy protein supplement TEP-mix using in the diets of cows a 735.5 kg or 11.1 % more milk were obtained from cows from the experimental group than from analogs from the control group. In this case, the average daily milk yield of the cows from the control group during the experiment was 28.3 kg of natural milk, and from the experimental group – 31.4 kg of milk, or 3.1 kg more than in the control. The use of proteins protected from digestion in the rumen and the essential amino acids contained in it contributed to an increase of the fat content in milk by 10.8 % compared with the control, and protein – by 3.5%, biological conversion of protein into milk by 14.5 % and energy conversions – 17.0 %.
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