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.
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