The influence of bloodlines of the Holstein breed on the productive qualities of cows of the Sychevka breed

Purpose: to study the current state of breeding cattle of the Sychevka breed in the territory of the Russian Federation, taking into account the level of Holstein. Materials and methods. The results of bonification and data from breeding and zootechnical accounting in breeding farms of the Smolensk region for 2023 were used. The number of cows of the Sychevka breed in the Smolensk region was divided into 5 groups, depending on the blood type of the improving Holstein breed of red-mottled color (%): less 17,5; 17,5—25,0; 25,1—50,0; 50,1—75,0 and 75,1 or more. Results. The analysis of dairy productivity of Sychevka cattle in the Russian Federation is carried out. According to the study, an increase in the milk yield of Sychev cattle in 2023 compared to 2019 in the Russian Federation averaged 793 kg. In animals in the Smolensk region with a blood content of more than 50 % of the Holstein breed, milk production is higher than in animals with a lower blood content, with a fat content in milk from 3,8 % to 4,0 %. The effect of blood supply on the live weight of animals has not been established. Animals with a blood content of more than 75 % have a good level of nutrition, and their milk yield for maximum lactation is higher than that of cows with less blood.