O. Smetanina, doctoral student
І. Ibatulin, Doctor of Agrarian Sciences
В. Bomko, Doctor of Agrarian Sciences
Bila Tserkva National Agrarian University and National University of Life and Environmental Sciences
This article shows the results of the efficiency elimination of Cobalt deficit in feeds that have been used in experimental feeding of highly productive cows of Holstein breed through various doses of mixed lygand cobalt complex to obtain clean milk. Deficiency of Copper and Zinc covered by sulfuric acid salts of these trace elements, as well as balancing rations for Selenium by sodium selenite rate of 0.3 mg selenium per kilogram SR.
In the feeding of experimental cows we used small component forage mixture composed feed-concentrates from mixed lygand complex of cobalt, sulfate salts of copper, cobalt and sodium selenite. Feeding experimental groups differed from the control group that cows of the 2nd experimental group eliminated the deficit by 90%, cows of the 3rd experimental group – 80%, cows of the 4th experimental group by 70% and cows of the 5th experimental group – 60%.
Based on data obtained during the scientific and economic experiment, it was found that the elimination of the deficit of cobalt in the forage mixture of 80% by mixed lygand complex of cobalt in the diets of dairy cows of Holstein breed in the dry period and the lactation period, provided the experimental cows in this element and encouraged by the highest productivity compared to the control and experimental groups, which eliminated the deficit in zinc 100%, 90%, 70% and 60%. The highest yield of natural milk during milking, milk production and the launch and for the entire 305 days of lactation had cows from the 2nd, the 3rd, the 4th and the 5th research group that dominated cows analogue of controls for the gross yield natural milk respectively, at 194; 481; 179 and 60 kg, or to 1.26; 6.43; 2.39 and 0.80%.
It was found that the highest milk productivity tested cows had on the 55th and 60th day after calving.
In the milk of the tested cows except the 3d tested group it was found increasing of fat content on 0,01 – 0,03 % in the 1st control group – 3,67%, the 2d – 3,70%,the 3d – 3,69 %, the 4th – 3,73% and the 5th – 3,72 %.
Gross milk yield per cow per lactation natural milk made: in the 1st control group -7477 kg, 2-kg experimental – 7574 or by 1.26% more than in control, 3rd – 7958 kg, or 6.43% more than in control, in the 4th – 7656 kg, or 2.39% more than in control and in the 5th – 7537 kg or 0.8% more than in the control.
Based on data obtained during the scientific and economic experiment it was proved that the best realized genetic potential of highly productive cows of Holstein breed German breeding area in the steppes of Ukraine cobalt eliminated the deficit by 80% through the use of mixed lygand complex of this element.
Key words: highly productive cows, premix, minerals, trace sulfate salts of copper, zinc, sodium selenite, mixed lygand complex of cobalt, lactation, milk yield, milk fat, forage mixture, deficit.