OPTIMIZATION OF CAROTENE AND VITAMIN E REQUIREMENTS FOR DAIRY COWS OF HOLSTEIN BREED OF BELARUSIAN SELECTION IN DRY AND INCREASED MILK YIELD PERIODS
Abstract
With the strengthening of the milk productivity potential of cows, the animals’ need for biologically active substances, including vitamins, increases significantly. Lactating cows need carotene, vitamins E and D in their feed. Vitamin concentrates in premixes predominantly fill the deficiency of these micronutrients in the diets of high-yielding animals. The aim of research was a comparative evaluation of the efficiency of using increased levels of vitamins A and E in the diets of Holstein dairy cows of Belarusian selection in dry, fresh and increased milk yield periods during mixed feeding. As a result of comparative evaluation, 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 was established. Application of these requirements 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
Russian Federation
Russian Federation
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 IN DRY AND INCREASED MILK YIELD PERIODS. Zootechnical Science of Belarus. 2024;59(2):86-97. (In Russ.)
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