Комплексная оценка быков-производителей
2010
Pavlova, T.V., Belarus State Academy of Agriculture, Gorki (Belarus) | Saskevich, S.I., Belarus State Academy of Agriculture, Gorki (Belarus) | Kazarovets, N.V., Belarus State Agrarian Technical Univ., Minsk (Belarus) | Gavrichenko, N.I., Belarus State Academy of Agriculture, Gorki (Belarus)
In the conditions of the Republic of Belarus there was realized a complex evaluation of producer bulls of different genotypes of origin for the further correction and breeding in different categories of agricultural enterprises. In course of the study there was conducted a preliminary (without quality evaluation of daughters) estimation of bulls which gave a precise performance of each bull, made it possible to correct its type and direction of breeding. Research made it possible to considerably increase the genetic trend in accordance with indexes of milk productivity which would make it possible to form a regional type of black-and-white cattle with the given indexes of productivity and reproduction. In course of the study there were analyzed the following breeds: black-and-white, Holstein, Hungarian breeding, Swedish breeding. Comparative evaluation of reproductive qualities of bulls in accordance with age-specific and breed types was presented. Body conformations of bulls of Holsten and Black-and-white of different ae-specific groups were stated. Results of complex evaluation of full-grown, under 5 year-old and replacement producing bulls of Holstein and Black-and-white breeds were presented.
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