Evaluation of Holstein cattle by a complex of traits in the breeding farm of the Russian Federation

摘要

The cattle were evaluated on the basis of productivity and reproduction indices both individually and in the terms of their genealogical groups. As a result of the correlation data analysis with the milk yield from 4.000 to 12.000 kg, a mathematical relationship between the individual and group values of the reproductive function parameters and the milk production was obtained. It was established that the correlation coefficient (g) between fat and protein was not as the standard and averaged up to +0.188. This means that when selecting animals with a high content of protein in milk, only in 20% of the cases will have a fat increase. It is noted that the age of the first insemination and the body weight at the 1st insemination are quite close to the standard indicators that are typical for this breed, which are 14-15 months and 370-380 kg, respectively. The productivity of first-calf heifers of the line Vis Back Ideal 933122 exceeded on average by 99 kg of milk on the first lactation; by the second lactation of the Reflection Sovereing 198998 cattle exceeded the productivity of other lines by 135 kg of milk.