Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
ABSTRACT. The aim is a comparative analysis of the results of bulls evaluation in synthetic populations of Red Steppe and Holsteinized Black-and-White cattle using methods Daughters − Mothers, Daughters − Peers, BLUP and Comparison of Peers. In the surveyed herds, the best breeding value had bulls, which were evaluated in pairs mother−daughter. This approach resulted in the most complete coincidence with the average assessment of bulls by sum rank values, except in some cases, where the deviation in scores exceeded a 3-point range. A high correlation coefficient by milk yield was obtained, when comparing the evaluation methods BLUP − MCC (r = 0.98) and “Daughters−Mothers” − “Daughters−Peers”. Significant discrepancies were revealed between the forecast by genomic evaluation of bulls with the actual productivity of the offspring within the same region and in different herds, which may be due to the quality of breeding stock in herds, the conditions of feeding and housing of animals. Therefore, genomic evaluation now should be used primarily to assess the level of heterozygosity in the herd. Creating in Russia the own reference herd and the diallelic locus sets for different breeds can make it possible to use the associative genomic assessment more competently in dairy husbandry. In addition, the materials obtained by genomic evaluation of bulls require extensive production testing in comparison with the country's existing complex bulls evaluation system, which in Russian breeding plants and reproducers gives stable positive results.
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