Features of the increase in live weight of the offspring of sire bulls as successors of the created lines
The study was carried out on the descendants of cows of simmentals of the Bredinsky meat type, obtained from the use of bulls-producers of the Bredinsky meat type Start 3237 and Veterka 4249, as well as a bull-producer of meat simmentals of the Canadian selection of Rimbaud 105888518. It was established that the young animals grew well and developed during the suckling period and in live weight at the age of 7 months he met the requirements of the elite-record class. The best results for this period in live weight were typical for the offspring of bulls-producers Start 3237 and Rimbaud 105888518, the average daily gain of which was more than 1 kg. Further growth of the animals was in line with the expected result, despite a slight decrease. It was established that after weaning from mothers and up to 18 months. the highest growth intensity was characteristic of the descendants of the bull-producer Start 3237. For the period from 7 to 15 months. their average daily growth was 942.0 g, which was 19.8 g more. In general, bulls of all studied groups grew intensively, developed well during all periods of growth up to 18 months. and in live weight they met the requirements of the elite class, the elite-record. The results of additional indicators of the intensity of growth, such as the coefficient of increase in body weight and the relative growth rate, were quite consistent with the general patterns of their changes.