Resumo

SIFUENTES RINCON, Ana María et al. Loci associated with genetic disorders and meat quality in Charolais cattle in Mexico. Rev. mex. de cienc. pecuarias [online]. 2015, vol.6, n.4, pp.361-375. ISSN 2448-6698.

Allelic and genotypic frequencies of eight markers previously associated to genetic disorders and meat quality and located in the calpain (CAPN1-4751 and CAPN1-316), calpastatin (CAST-T1), thyroglobulin (TG5), myostatin (MSTN, Q204X), argininosuccinate synthase (ASS), monophosphate synthase (UMPS) and myophosphorylase (PYGM) genes, were determined from 493 registered Charolais animals sampled from two herds located at Sonora (n= 157) and three at Nuevo León (n= 336), Mexico. No carriers of mutated alleles of ASS and UMPS genes were found, but carriers of the MSTN Q204X allele were identified at frequencies of ≤ 1 % in Sonora populations and 8.6 to 14.4 % in Nuevo Leon. In addition, carriers of PYGM marker were identified at frequencies of 6.49 and 1% in a herd from Sonora and other from Nuevo León, respectively. Analysis of gene differentiation among herds and with four loci showed that there are highly significant differences within Northwest populations (P<0.0001) and between them and the Northeast (P<0.001), differentiation is mainly explained by the loci CAPN-316 and TG5. According to the obtained results, the periodic monitoring of the PYGM marker gene and of the allele Q204X the MSTN gene is propose; also it is important to implement strategies to confirm the usefulness of those markers associated with quality and productivity as a tool to complement breeding programs.

Palavras-chave : Genetic defects; Marbling; Tenderness; DNA.

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