OPTIMIZATION OF STANDARD REQUIREMENTS FOR CALCIUM, PHOSPHORUS, MAGNESIUM, SULFUR AND VITAMIN D IN HOLSTEIN DAIRY COWS IN DRY, FRESH AND INCREASED MILK YIELD PERIODS
https://doi.org/10.47612/0134-9732-2022-57-2-62-71
Abstract
Cows of Holstein breed, actively used in dairy cattle breeding of the Republic of Belarus, have high milk yields and, therefore, a higher requirement for nutritional components compared to bred animals of the Belarusian Black-and-White breed. The article contains the results of studying zootechnical and economic efficiency of the increased rates of phosphorus, magnesium, sulfur and vitamin D (up to 10 and 15 %respectively) in the diets of highly productive cows of the Holstein dairy cattle breed of domestic selection for the Belarusian Black-and-White breed in the 1st and 2nd phases of the dry period and in the 1st third of lactation. It was found that the developed standard requirements for the above nutritional components had a positive effect on productivity and milk quality, as well as homeostasis, digestibility of organic matter and the use of nitrogen in the animal body.
About the Authors
A. I. Sakhanchuk
Scientific and Practical Center of the National Academy of Sciences of Belarus for Animal Breeding
Belarus
Belarus
M. G. Kallaur
Scientific and Practical Center of the National Academy of Sciences of Belarus for Animal Breeding
Belarus
Belarus
E. G. Kot
Scientific and Practical Center of the National Academy of Sciences of Belarus for Animal Breeding
Belarus
Belarus
A. A. Nevar
Scientific and Practical Center of the National Academy of Sciences of Belarus for Animal Breeding
Belarus
Belarus
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Review
For citations:
Sakhanchuk A.I., Kallaur M.G., Kot E.G., Nevar A.A. OPTIMIZATION OF STANDARD REQUIREMENTS FOR CALCIUM, PHOSPHORUS, MAGNESIUM, SULFUR AND VITAMIN D IN HOLSTEIN DAIRY COWS IN DRY, FRESH AND INCREASED MILK YIELD PERIODS. Zootechnical Science of Belarus. 2022;57(2):62-71. (In Russ.) https://doi.org/10.47612/0134-9732-2022-57-2-62-71
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