The qualitative composition of cow's milk when introducing an energy feed additive "Zeolfaт"

Abstract

The development, testing and introduction into practice of feeding lactating cows of energy feed additives with mineral components for the preparation of compound feeds-concentrates that provide the necessary amount of energy and minerals, is currently a particularly urgent task. The aim of the work was to study the effect of the energy feed additive "ZeolFat" on the qualitative composition of cow milk in the first phase of lactation. The introduction of energy concentrate in the diet at doses of 200, 400 and 600 g / head per day allowed to increase the content of raw fat by 6.69%, 13.38 and 19.91%; exchange energy by 1.46, 2.92 and 4.37%, respectively. As a result, we observed an increase in the average daily milk yield in the experimental groups, which was (in terms of the basic fat content (3.4%)): in the I-th - 8.1%, in the II-th - 13.7, in the III - th-14.3% compared to the control. Filling the lack of energy and minerals in the diet with the introduction of the studied supplement contributed to a change in the quality composition of milk. In comparison with the control group, the content of dry substances in the milk of cows of the experimental groups was higher by 0.1...0.6%, and the dry skimmed milk residue - by 0.01...0.11 %. There was also a tendency to increase the mass fraction of fat in milk in group I by 0.08 %, in group II-by 0.14 %, in group III-by 0.21 % in relation to the control; an increase in the mass fraction of protein, respectively, by 0.04; 0.12; 0.14 %. The indicators of density and titrated acidity, the level of ketone bodies and acetone in the milk of cows of all groups met the requirements of GOST R 31449-2013. The concentration of urea in the milk of experimental cows was lower than in the control, by 3.46...4.43 %. According to the number of somatic cells, the milk of all cows met the requirements of the highest grade, while in the experimental groups the indicator was lower by 25.6...74.8 %.