The allelotypes of the analyzed populations of Black-and-White cows bred in the Tver Region and the Republic of Ingushetia have been reported. The strong effects of breed and trends for its production parameters in the analyzed Black-and-White cows bred in the Tver Region and the Republic of Ingushetia, rather than the ecological impact, are revealed. The frequency of the «bad» A1 allele at a beta-casein locus was higher in the animals in the Tver Region, comprising 0,56, while the “normal” A2 allele was reported at a frequency of 0.44. Quite similar results were obtained for the analyzed cows in the Republic of Ingushetia. Thus, the frequencis of the «bad» A1 allele and the normal allele comprised 0,52 and 0,48, respectively. The findings based on the survey results can indicate that the selective breeding activity in the Tver Region herd requires a shift towards increasing the occurrence of the favourable A2 alleles due to selecting the bull sires with the target genetic traits.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.