THE CORRELATION BETWEEN DAIRY PRODUCTIVITY TRAITS IN THE HERD OF HOLSTEINIZED COWS
In the breeding work of dairy cattle, the nature of the relationship between milk yield and the mass fraction of fat and protein in milk, live weight and milk yield, etc. is of the greatest importance. As a starting material for research, we used the information of zootechnical registration obtained in LLC Dubna Plus of the Dmitrovsky district of the Moscow region, where Holstein cattle are bred. The purpose of the research is to study the correlation between the signs of milk productivity in a herd of Holstein cows. The studies were carried out by grouping animals for each of the studied factors, followed by mathematical processing of digital material in Microsoft Excel. The correlation coefficients between the signs of milk productivity for lactations in cows of the Holstein breed were determined, so for the first, second, third and highest and lifetime lactations between signs of milk productivity in cows of this herd. The obtained correlation coefficients in daughters for milk productivity indicate the individual characteristics of individual producers. The parameters of the relationship between signs of milk productivity must be taken into account when improving the Holstein cattle.