Selection index of black-and-white breed sires of population in Moscow region on the traits of dairy productivity, reproduction and exterior of daughters

The article presents the results of the calculation of the selection index of black-and-motley sires of the population of the Moscow region on the signs of dairy productivity, reproduction and exterior of daughters. Achieving the maximum selection effect can be achieved using aggregate information on selection traits, which can be obtained using a selection index. And since the selection index in this case implies an assessment of the producers, then in the future it would be necessary to evaluate the breeding value of the daughters themselves through the selection index.

Introduction. The aim of the work was to develop a comprehensive system for assessing the economically useful traits of black-and- white sires based on the selection index.

Object. The object of research were first-calf heifers (n=10492) of the black-and- white breed of the Moscow region.

Materials and methods. The data includes traits of milk production, fertility and exterior. As exterior features, we took into account 17 features of the linear evaluation of the "B" system.

Results and conclusions. The daughters of the studied black-and-white breed sires have fairly good indicators of milk productivity, with a milk yield of 7142.8 kg of milk for the 1st lactation with a protein and fat content of 3.25 and 4.10%, respectively. Traits of fertility and milk production have low values of the coefficient of heritability. Among them, the protein content (h2 =0.17) and the age of the 1st fruitful insemination (h2 =0.18) stand out. Regarding the traits of exterior, they also do not differ in a high level. Only stature, rump angle, teat length, and angularity have higher heritability values (h2 =0.19-0.22). Milk yield for the first lactation has a negative correlation with fat and protein content (r = -0.382…-0.448). At the same time, they have a positive relationship with each other (r = 0.584). Of all the studied traits, such traits of reproduction as the number of inseminations / service period and intercalving period had the highest correlation between themselves (r = 0.8-0.9). The same regularity was noted in their phenotypic correlations. Their negative relationship with the milky type was also established (r = -0.471 ... -0.573). With a change in the share of weight coefficients, a change in the indicators of the selection index (ETI) is observed. The highest and lowest values are observed in the second column, where 0.5 (50%) of the selection weight is assigned to the share of milk productivity. Achieving the maximum selection effect can be achieved using aggregate information on selection traits, which can be obtained using a selection index.

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