Abstract
The purpose of the study is to establish the estimated breeding value index of Kazakh white-headed cattle by productive indicators. The Estimated Breeding Value (EBV) of the productive indicators of animals of the Kazakh white-headed breed was determined for 2018-2021. The index values were further interpreted as an assessment of the own genetic productivity of each evaluated animal relative to the corresponding average values. For the Kazakh white-headed breed, the estimated breeding values in terms of live weight at birth in 2018 ranged from -8.00 to +12.91, in 2019 from -8.02 to +19.42, in 2020 from -9.96 to -0.96, in 2021 -9.87 to +19.91. The values by the indicator of live weight at weaning in 2018 ranged from -8.63 to +57.39, in 2019 from -23.27 to +57.31, in 2020 from 23.97 to - +57.29, in 2021 -24.37 to +57.26. The estimated breeding value in terms of live weight at one year of age in 2018 varied in the range from -51.37 to +58.26, in 2019 -58.53 to +72.10, in 2020 -57.77 to +71.43, in 2021 -52.73 to +72.00. The breeding value in terms of live weight for adult animals in 2018 ranged from -50.60 to +43.19, in 2019 -135.95 to +118.86, in 2020 from -138.04 to +121.82, in 2021 from -140.56 to +112.43. The breeding value by the milking capacity of mothers of the Kazakh white-headed breed in 2018 ranged from -35.55 to +33.79, in 2019 -8.85 to +46.67, in 2020 from -27.41 to +46.68, in 2021 from -30.26 to +46.65. The accuracy for the EBV of productive indicators of Kazakh white-headed breed animals was 0.004-0.999 by live weight at birth, 0.001-0.998 at weaning, 0.002-0.998 at 12 months, and 0.001-0.965 for adult animals. The estimated breeding value of dairy cows is 0.018-0.990. The features of the distribution of the indices of breeding value of the average daily increase of animals of the Kazakh white-headed breed in 2021 have been clarified. For the Kazakh white-headed cattle breed, the estimated breeding values in terms of the average daily gain from birth to 12 months of age are in the range from -183.56 to +813.34.
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