Influence of Holstein breed on milk production of black-and-white cattle in result of absorption

In this article, we have studied the effect of Holstein on the level of milk productivity of Black-and-White cows. We conducted research in the breeding reproductor of the Federal State Budgetary Educational Institution of the Russian Federation, where a comparative assessment of the dairy productivity of cows was carried out. In the course of the study, we studied data on the productivity of cows with different bloodlines. To assess the effect of bloodliness on milk parameters, statistical data processing was carried out, which showed that an increase in bloodliness above 95% for Holsteins in cows is associated with a decrease in the amount of milk received. This may be due to the deteriorating health of the animals. It was determined that with an increase in blood count above 95% HF in cows, the amount of milk received decreased in all years of birth (2016, 2017 and 2018), despite the fact that in one and the other group there was an increase by year of birth. It was found that with an increase in the blood count of cows up to 95% and above, there was a tendency to increase the coefficients of variation of milk yield for 305 days of the first lactation, although for all assessed traits from 2016 to 2018, a decrease in the coefficients of variation was observed. This may indicate the consolidation of signs of milk production. The analysis of data on the influence of blood on milk indicators in cows is an important step in understanding the genetic factors that affect the productivity of animals. This knowledge can be used to develop new strategies to improve milk quality and animal health, as well as for more efficient and Вестник аграрной науки, 3(102) 2023 DOI: 10.17238/issn2587-666X.2023.3.104 104 productive farming. Thus, our research confirms the positive effect of Holstein on the quality of milk in Black-and-White cows. It can be concluded that under conditions similar to those that have developed in the herd of the federal scientific center of leguminous crops, it is advisable to breed cattle with a blood count of about 15/16 Holstein, despite the fact that officially this cattle is classified as a purebred Holstein breed.