OPTIMIZATION OF CAROTENE AND VITAMIN E REQUIREMENTS FOR DAIRY COWS OF HOLSTEIN BREED OF BELARUSIAN SELECTION DURING LACTATION PERIOD
Abstract
High-yielding cows are most in need of vitamins, micronutrients and other biologically active substances as they build up their milk production potential. Rationing of carotene, vitamins E and D depends largely on the type of feeding, the ratio of nutrients in the diet and the level of animal performance. The article presents data on comparative evaluation of the effectiveness of increased levels of carotene (vitamin A) and vitamin E in the diets of high-yielding Holstein cows of Belarusian selection in the 2nd and 3rd third of lactation during mixed feeding. As a result of research, the advantage of moderately increased requirements for carotene (vitamin A) and vitamin E by 10% per 1 kg of dry matter of the diet for high-yielding dairy cows of Holstein breed of Belarusian selection has been established, application of which provides an increase in daily yield of milk of standardized 4% fat content in the 2nd and 3rd third of lactation (by 5.68 and 5.34%), higher milk protein yield (by 6.06 and 5.73%), greater stability of lactation over time (by 0.04%), and can become one of the factors to increase biological full-value of diets.
About the Authors
A. I. Sakhanchuk
Scientific and Practical Center of the National Academy of Sciences
of Belarus for Animal Breeding
Belarus
Belarus
Zhodino
M. G. Kallaur
Scientific and Practical Center of the National Academy of Sciences
of Belarus for Animal Breeding
Belarus
Belarus
Zhodino
E. E. Kot
Scientific and Practical Center of the National Academy of Sciences
of Belarus for Animal Breeding
Belarus
Belarus
Zhodino
A. A. Nevar
Scientific and Practical Center of the National Academy of Sciences
of Belarus for Animal Breeding
Belarus
Belarus
Zhodino
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Review
For citations:
Sakhanchuk A.I., Kallaur M.G., Kot E.E., Nevar A.A. OPTIMIZATION OF CAROTENE AND VITAMIN E REQUIREMENTS FOR DAIRY COWS OF HOLSTEIN BREED OF BELARUSIAN SELECTION DURING LACTATION PERIOD. Zootechnical Science of Belarus. 2024;59(2):97-106. (In Russ.)
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