Abstract
Abstract The research aims to determine the selection parameters of Holstein cattle bred in the Republic of Kazakhstan, to conduct a linear assessment of the exterior of Holstein cows according to 18 indicators. It was established that the dairy productivity of first-calf heifers of AF Rodina LLC amounted to 9,520 kg in milk yield, 3.6% in fat, 3.1% in protein, ICE LLC - 9,800 kg in milk yield, 3.7% in fat, 3.2% in protein, Bayserke-Agro LLC - 8,830 kg in milk yield, 3.7% in fat, 3.6% in protein, in RZA - Asyl Tulik LLC - milk yield - 8,147 kg, fat - 3.5%, protein - 3.3%. The conducted studies showed that the dairy productivity of cows of the 2nd, 3rd, and 4th lactation in AF Rodina LLP averaged 10,932 kg of milk with fat content in milk of 4%, and protein content in milk of 3.1%, respectively. In ICE, the milk yield was 10,700 kg, fat was 3.9%, and protein was 3.3%. In Baiserke-Agro dairy productivity was 8,436 kg, fat - 3.7%, protein - 3.4. In RZA- Asyl Tulik milk yield averaged 8,500 kg, fat - 3.5%, protein - 3.2%. It was found that the average exterior indicators of Holstein cows from the base farms differed significantly from the optimal scores, while most of the exterior indicators of ICE LLC were within the range close to the desired values.