Abstract
This article presents the results of the level of feeding and the health status of dairy cows in a commercial dairy farm on the content of the main components in milk (fat, protein, urea). The aim of the research was to study the milk productivity and composition of milk of cows, to analyze the level of feeding and the content of basic nutrients in the diet of the farm. The object of the research was Holstein cows in the amount of 483 heads of Aina Dairy Farm LLP. The studies were carried out according to generally accepted zootechnical methods using modern equipment for conducting analyzes and interstate and state standards. An increase in the norm of the content of crude protein in the diets of dairy cows to 17.4% DM led to an increase in the content of urea by 2.3% in comparison with the norm in the milk of cows of the first group, while the content of urea in the milk of the second group remained within the limits valid values.