Assessment of the selection structure of the kazakh white-headed cattle herd

   In the breeding farm Kolos LLC in the Altai Territory, which is engaged in the breeding and selecting Kazakh white-headed cattle, bulls were assessed by their productivity, sires by the quality of their offspring, lines, breeding and production groups. It has been established that, regardless of which trait is taken as the base one, the bulls of the selection group exhibit highly productive qualities. Analysis of correlation coefficients allows us to note a strong connection between live weight and average daily gain, feed costs, assessment of meat qualities, relative gain, and the “A” index. A comparative evaluation of stud bulls based on the quality of their offspring indicates that the sons of Zaur 70099, Pankrat 6809, and Simons 6633 are improvers. When assessing the genealogical structure, the best indicators are shown by bulls belonging to the line of Castle 3335. When comparatively evaluating the strength of the influence of the line and the sire bull on the variability of traits, it was established that the stability of the impact of the sire bull is, as a rule, higher than the influence of the line and for the most critical traits it is more than two times. The highest power of the sire’s influence is noted for such characteristics as live weight, average daily gain, assessment of meat qualities, and complex index “A”. The population of the Kazakh white-headed breed has a high selection potential in assessing animal gene pool and phenol. Also, it has an optimal level of genetic variability of traits, expressed through the strength of the sire’s influence on the variability of traits.