Heritability of breeding traits in Holstein cattle lines

In dairy cattle breeding, the method of line breeding is used to improve the productivity of cows. This method allows to establish the most desirable genotype. It should be noted that not always when carrying out breeding work with the herd take into account hereditary qualities, which largely reflect the level of productivity in the population of animals and their transmission to the next generation. Thus, taking into account the selection and genetic parameters, such as correlation and heritability, it is possible to identify the best combinations in the lines, thereby increasing the quantitative and qualitative indicators of milk productivity. Studies have been conducted on animals, OOO "Jupiter" in Orel region. Indicators of correlation, heritability of milk productivity of Holstein cows were studied. Cows of different lines differently inherit the value of milk yield and the content of fat and protein in milk. As a result of this study, it can be concluded that the greatest correlation between milk yield for 305 days, the protein content in milk between mothers and daughters in the lines of Holstein bulls is observed in the line Reflection Sovereign 198998, and the fat content-in the line Montvik Chieftain 95679. The most accurate assessment of bulls-producers of Holstein breed on all indicators of milk productivity have bulls line Wise Back Ideal 1013415. The best heritability on all signs of milk productivity has a line Reflection Sovereign 198998.