Aptitud productiva de la raza bovina Pasiega inferida de genes asociados con caracteres productivos

Frequencies of candidate genes and associations with carcass and meat traits in Nellore and crossbred cattle

“…Barendse et al (2006) observed contrasting results, i.e., a positive association between the DQ667048.1:g.3290G > T SNP of RORC and the marbling score in the Angus and Shorthorn (B. taurus) breeds, in which the T allele proved favorable for the trait. Similarly, Sevane et al (2011) found significant relationships in bovines of the Pasiega breed, in which the genotypes containing the T allele (GT and TT) presented significant association with increased back fat thickness. The disparity between these results and those obtained in the present study confirms that associations between molecular markers and traits of interest for specific populations are not immediately applicable to other ones, since the allele substitution effect of a polymorphism is due to widely known factors and parameters that are intrinsic to each population or breed in a given environment.…”

“…However, there are no reports in the literature regarding association studies between this polymorphism and traits of interest in cattle. Other polymorphisms have been described for bovine IGF2, and a few studies have shown a direct association between them and carcass and meat traits (Schmutz & Goodall, 2005;Sherman et al, 2008;Zwierzchowski et al, 2010).…”

“…obtained frequencies of 0.433 for the G allele and of 0.567 for T, values similar to those of crossbred animals (B. indicus × B. taurus). Sevane et al (2011) reported the frequencies of 0.300 and 0.700 for the G and T alleles, respectively, in bovines of the Pasiega (B. taurus) breed. The trend observed in these studies, in which B. taurus animals show a higher T-allele frequency, are similar to those of the present study, in which the groups that comprised crossbred B. taurus animals had, on average, a higher frequency of the T allele than of the G allele.…”

“…Polymorphisms of the IGF2, PMCH, and RORC genes were associated with carcass and meat traits in Bos taurus cattle (Schmutz & Goodall, 2005;Barendse et al, 2006;Sherman et al, 2008;Helgeson & Schmutz, 2008;Zwierzchowski et al, 2010;Sevane et al, 2011). However, before using molecular markers that have been identified for other populations, it is critical to study their effects on traits of interest in different breeds and environments (Allais et al, 2011).…”