Different levels of mixed-ligande complexes of Zinc, Manganese and Cobalt in the feeding of highlyproductive Holstein cows of German selection and their impact on feed consumption, productivity, feed consumption, reproductive function and hematological pa
The article presents the results of studying the effect of different doses of mixed-ligande complexes of Zinc, Manganese and Cobalt in feeding high-yielding Holstein cows of German selection on feed consumption, milk productivity for the first 100 days of lactation, reproductive function and hematological parameters. It was found that lower doses of Zinc, Manganese and Cobalt improved feed intake by experimental cows. On the average for experiment of cows of the 1st control group ate 53.4 kg of a forage mix, cows of the 2nd experimental group – 54.5 kg, 3rd – 58.2 kg, 4th – 55.7 kg and 5th - 52.8 kg. The average daily milk yield and milk yield for the first 100 days of lactation varied depending on the intake of Zinc, Manganese and Cobalt to the body of experimental cows. The lowest milk yields of natural milk for the first 100 days of lactation were cows of the 5th experimental group, where the concentration of trace elements in 1 kg of DM feed was the lowest and was, mg: Zinc – 42.6; Manganese – 42.6 and Cobalt – 0.55. The milk yield of natural milk of cows of the 1st control, 2nd, 3rd and 4th experimental groups was higher than the milk yield of cows of the 5th experimental group by 106.3 %, 106.2; 113.6 and 108.8 %, respectively. The fat content in the milk of cows of the 5th experimental group averaged 3.57 %, while in the milk of cows of the 1st control, 2nd, 3rd and 4th experimental groups it was higher by 0.01- 0.05 %. Higher concentrations of trace elements had a positive effect on the duration of the service period and in the experimental animals of the 1st control, 2nd, 3rd and 4th experimental groups, it was shorter by 14.0; 16.2; 30.3 and 10.9 days, respectively. One fertile insemination of each cow of the 1st control group required 1.5 inseminations, in the 2nd experimental – 1.6; in the 3rd experimental – 1.4; in the 4th experimental – 1.6 and in the 5th experimental – 1.9 fertilization. Analysis of hematological parameters of experimental cows shows that mixed-ligande complexes of Zinc, Manganese and Cobalt in concentrated feeds have a positive effect on the body of lactating cows, which, in turn, improves their productivity and especially reproductive functions. The most effective was the dose of mixed-ligande complexes of Zinc, Manganese and Cobalt with a concentration of 1 kg of DM feed mixture, mg: Zinc – 54.7; Manganese – 54.7 and Cobalt – 0.7.
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