Abstract

In dairy cattle breeding, in order to maintain the level of productivity of cows of a certain line, intralinear selection is used, which allows consolidating valuable genes of the ancestor of the line in the resulting offspring. At the same time, in order to identify the manifestation of the heterosis effect by the leading breeding characteristics, it is necessary to study the compatibility of lines. The purpose of the conducted research was to study and identify the most effective variant of interlinear crossing and intra-linear selection of animals of the Vis Idial 933122 and Reflection Sovering 198998 lines, which increases the productivity of Holstein black-and-white cattle bred in Agro-Soyuz LLC. Four groups of cows were formed for the research, with a total number of 210 heads. Analysis of the data obtained showed that the highest milk yield for lactation, milk fat yield, milk protein yield and milk content index were characterized by cows obtained as a result of in-line selection of animals from the Vis Idial 933122 line, whose superiority over cows of other experimental groups was, respectively, 132-668 kg; 1.5-26.4 kg; 1.7-22.0 kg and 2.8-49.6 kg. Thus, in order to opt for one of the breeding techniques to increase the dairy productivity of cattle, it is recommended that a comparative assessment of the productive qualities of cows obtained on the basis of in-line selection and line crossing be carried out in each dairy herd.

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