Different levels of mixed-ligande complexes of zinc, manganese and cobalt in feeding highly productive cows of the Ukrainian red-spotted dairy breed the first lactation period

Abstract

Purpose. To study the effectiveness of feeding different levels of mixed-ligande complex of zinc, manganese and cobalt with Suplex Se to high-yielding cows of the Ukrainian red-spotted dairy breed in the first period of lactation and their impact on feed consumption, productivity and hematological parameters of blood. Methods. Five groups (one control and four experimental) of highly productive cows of the Ukrainian red-spotted dairy breed, 10 heads each, were selected for the research at «Terezyne» farm, Bila Tserkva district, Kyiv region, on the principle of analogues. Experimental cows were fed the same rations. For cows of the control group the optimal dose of a mixed-ligande complex of Zinc, Manganese and Cobalt was used, which was established in a previous experiment with concentration in 1 kg of dry matter (DM) of feed, mg: zinc – 60.8; manganese – 60.8 and cobalt – 0.78. In the 2nd experimental group, concentration of those trace elements was higher compared to the control by 10%, and in the 3rd, 4th and 5th experimental groups, respectively, 10, 20 and 30% lower. Results. The best results in terms of milk productivity were obtained from cows of the 4th experimental group. For 80 days of the experiment from cows of the 1st control group 3080 kg of milk of natural fat content was obtained, and of the 2nd, 3rd, 4th and 5th experimental groups – respectively 48, 112, 200 and 136 kg, or by 1.6; 3.6; 6.5 and 4.4% more. Lower doses of micronutrients meet the needs of highly productive cows in them, which has a positive effect on the reproductive functions of animals. The most effective was the dose for the cows of the 4th experimental group, where duration of the service period was 78.6 days against 91.9 days in the 1st control group, and one fertile insemination in this group took 1.8 times at 3.1 times in control. Analysis of hematological parameters of the experimental cows shows that different levels of mixed-ligande complexes of zinc, manganese and cobalt in concentrated feeds have a positive effect on the body and health of lactating cows. Conclusions. The best results of milk productivity and reproductive function were obtained from cows of the 4th experimental group, where concentration of zinc, manganese and cobalt due to their mixed-ligande complexes in 1 kg of DM feed was, mg: zinc – 42.6; manganese – 42.6; cobalt – 0.55. This dose of trace elements had a positive effect on the consumption of animal feed, their unit cost and hematological parameters of cows' blood.