Abstract:

In order to analyze the associations of UCP3 gene polymorphisms with fattening and growth traits in Simmental. The locus of BglI of UCP3 gene was genotyped by PCR-RFLP and DNA sequencing in Simmental to investigate the associations. The results showed that the locus of BglI demonstrated polymorphisms was at Hardy-Weinberg equilibrium. The associations of polymorphisms of UCP3 gene with fattening traits showed that the individuals with genotype AA had a lower FCR and a higher ADG value (P<0.05); As for the growth traits, the locus of BglI had an major affect on withers height, body length and chest girth at 15 months of age, withers height at 12 months of age, body length at 8 months of age. Among the phenotypes which were significantly associated, individuals with homozygote of AA genotype had a significantly higher average value than that one or the other genotypes (P<0.05); About the carcass length, carcass chest depth and fat thickness traits, individuals with homozygote of AA and AB genotype also had a significantly higher average value than that of BB genotype (P<0.05). In addition, the individuals with genotype AB had a higher mean value for hind leg wide than those with the genotype AA and BB (P<0.05). So the genotype AA was significantly associated with the fine fattening performance and the selection of the allele A was better for the trait improvement.