Abstract
The article presents the results of the zootechnical and economic effectiveness of using moderately increased demand standards for Ca, P, Mg, S, and vitamin D (up to 10 and 15%, respectively) in the diets of highly productive cows of the Holstein dairy cattle of the Belarusian selection by the Black-and-white breed at the 2nd and 3rd thirds of lactation, and the impact on the dairy performance and milk quality, homeostasis, digestibility of organic matter, and the nitrogen use in animal body. A positive effect has been determined of moderately increased demand standards for the above-mentioned nutrient components in the diets of animals with a predominance of bulky feed against concentrates.
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