SIRE-BULLS INFLUENCE ON OFFSPRING PERFORMANCE, DEPENDING ON METHODS OF THEIR BREEDING
The studies were conducted in four farms, were evaluation of bulls by the quality of offspring took place. Productive indicators analyzed by one lactation daughters of 10 bulls in 1133 – producers for the period from 2010 to 2012. In general, the relationship between milk yield of mothers and daughters is a weak negative (r = –0,05), between mothers and daughters MWA also weakly negative (r = –0,02) between BMD and strong positive (r = 0,51) (Table 1). The correlation coefficient between the maternal milk yield and daughters from bulls outbred was r = 0,03, while in outbred bulls r = –0,08, which demonstrates a greater degree of influence of inbred manufacturers. On the basis of the mass fraction of fat in the correlation coefficient outbred bulls was smaller than in inbred (r = –0,04 and r = –0,02 respectively). Prepotent level was higher than the producers received outbreeding their prepotent index was 0.81 on average for the group, which is 9 % lower than the average for the group, and 14 % lower than the bulls received inbreeding – the group average index prepotent was 0,95.