Determination of the genetic value of animals of breeding groups for custom mating in the population of the red-mottled breed

Abstract

The significant indicators of the leading part of cows and bulls-producers of the Voronezh population have been studied and assessed. Indicators of the genetic value of traits in the population of cows (A) and breeding bulls (B) were calculated using the results in the calculated models. Cows of breeding groups of three farms were evaluated. An analysis of the register of breeding stock of breeding bulls revealed their critically small composition and relatively long-ago birth (2003–2008). There was a need for rotation and mandatory construction of their own genealogical structure of the red-mottled breed. The leading group of cows exceeded the breeding stock of the region in milk yield by 863 kg of milk, by 0.02% in terms of fat mass and 24 kg in live weight. The analysis of the breeding characteristics of the estimated and qualitytested offspring of breeding bulls was carried out. There was a gap in the dates of birth of the estimated breeding bulls and young ones, as well as the level of indicators of their mothers, which are inferior in milk yield according to parental indices by 3111 kg, and in the mass fraction of fat — by 0.25%. The requirements for the indicators of repair bulls have been increased. Indices of the genetic value of breeding bulls in the population (B) increased from 5764 kg of milk in previously estimated to 8051 kg in tested offspring quality, and by the mass fraction of fat — by 0.037%. The index of genetic value in cows has increased significantly, which surpassed the indicator of the main producing bulls. The parental indices of Holstein bulls selected in the group of “bull fathers” were 13,712–11,129 kg in milk yield, 4.34–4.85% in fat mass fraction, 3.32–3.52% in protein mass fraction.