Abstract
A study to find additional reserves for expanding the breeding beef cattle base and improving methods for selecting parental pairswas carried out. The issues of technical approachwere considered to substantiate the milkingabilityaccording to the herd. It characterizes the development of calves in the suckling period and significantlydetermines the weaning weight and the possibility of selection according to this basis. The method for selection of sires of Hereford and Aberdeen-Angus breeds with forecasting of breeding value of the selected trait in the reproduced progeny is presented. The index (IBS index of bull selection) was calculatedaccording to the phenotypic characteristics of the sire's selected traitbyweaning live weight of at least 40 its offsprings (20 bulls + 20 heifers) and average milking yield of the breeding stock, their deviations in herd and from the indicator of the desired type. Studying the breeding qualities of the Hereford and Aberdeen Angus bulls made it possible to draw a conclusion about the expediency of obtaining animals in the studied herds from the sires with a selection index of not less than 106% and 105 depending on their breed and the level of productivity of the breeding stock.
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