Эффективность определения племенной ценности быков-производителей в зависимости от метода оценки

Abstract

The purpose of the study is to determine the effectiveness of various methods for assessing the bree-ding value of bulls in the dairy cattle population of the Omsk Region. Objectives: to compare the effectiveness of assessing the breeding value of stud bulls using the “assessment by quality of offspring” and BLUP methods; to determine the correlation between the breeding value of bulls and the level of productivity of offspring. The object of the study was 67 bulls who were the fathers of 926 cows that completed their first lactation. The breeding value assessment using the Daughters-Peers method was carried out for 15 stud bulls. Of the bulls assessed using the Daughters-Peers method, 9 bulls were improvers, which is 60 % of all animals tested using this method. Using the BLUP method, from all bulls, positive breeding value was identified in 12 bulls, which is 17.9 % of the total number of bulls. When assessed by the Daughters-Peers method, the maximum number of bulls (33.33 %) have a breeding value for milk yield of 301–450 kg. The results of the BLUP assessment showed that 4 bulls, or 33.33 %, had a breeding value of less than 150 kg. The share of bulls with a breeding value of more than 451 kg is 25 %. The probability of error when selecting bulls with the best breeding value in terms of milk production is higher when it is determined by the Daughters-Peers method by 34 % compared to the BLUP method. When selecting bulls based on milk fat content, the assessment of breeding value using the BLUP method is more effective. The accuracy of the method is 47.7 % higher than when assessing breeding value using the Daughters-Peers method. Assessment using the BLUP method objectively and relatively accurately makes it possible to determine the genetic potential of animal productivity and optimally use them in breeding work.