Abstract
Allelic variants of single nucleotide CAPN1 and CAST polymorphisms in cattle are associated with “marbling” and “tenderness” of meat. SNPs in CAPN1 (rs17872000) and CAST (rs109221039) genes in beef cattle breeds being bred in the Republic of Belarus were studied using KASP and real-time PCR methods. Genetic structure analysis of studied samples from cattle populations by the CAPN1 gene showed that the frequency of occurrence of the preferential Callele associated with “marbling” in Aberdeen Angus cattle was 34.3%, in the Limousine breed ― 14.3%, and in the Hereford breed ― 13.9%. The frequency of occurrence of the preferential A allele (CAST), which determines increased “tenderness” of meat, was 87.1% in the Aberdeen Angus breed, 75.5% in the Limousin, and 77.8% in the Hereford. The use of genetic markers as an important additional criterion in meat cattle breeding in combination with main
 zootechnical methods will allow improving meat productivity.
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