摘要：An analysis of previous years shows that there is a gradual
increase in the rate of breeding and pedigree work, its intensification,
which is caused primarily by the implementation of new methods of
biotechnology and population genetics. In this regard, the improvement
and development of new criteria for cow evaluation taking into account
created highly productive lines, types, and populations are relevant for
science and practice. There was carried out scientific and economic
research in order to characterize the main indicators of the breeding value
of cows that belong to the created hornless Ural-type Hereford breed of
domestic breeding. The influence of these indicators on the formation of
the productivity of bull-calf progenies fell under the characterization as
well. There were formed five groups of full-aged cows (5-8 years) different
in productive qualities to determine the influence of the productive value
of mother cows on the pedigree and productive qualities of progenies.
Cows of all groups were inseminated by the deep-frozen seed of Hereford
bull of the “elite-record” class produced by Golub 4168. Five groups of
experimental bull-calves were formed by the method of groups-analogs
from the resulting progeny. The analysis of weight and linear growth of the
progeny bull-calves showed that all the animals normally developed being
characterized with the general patterns of ontogenesis. At the same time,
bull-calf progenies of cows different in productive value were inherent in
some features - the average live weight of bulls of group III was larger than
those of its peers from groups I, II, IV, and V by 27.4 kg (6.3 %, Р>0.95),
64.1 kg (16.1 %, Р>0.999), 28.9 kg (6.6 %, Р>0.95), and 47.4 kg (11.4 %,
Р>0.999), respectively.
