Estudo de associação genômica ampla para característica reprodutiva em fêmeas da raça nelore

Abstract

The age at first calving (AFC ) is an economically important trait in beef cattle. Aiming to evaluate the use of a genomic tool for association of single nucleotide polymorphism site ( SNP ) distributed in the bovine genome with reproductive characteristic of IPP in Nellore cows the study was conducted in 55 animals genotyped at high density panel to analyze more than 777,000 markers . The SNP located in rs110169757 BTA2 : 6151365 was considered the most significant and possibly correlated with the phenotype of IPP . In the region of 500 Kb for each side of the SNP position of 19 quantitative trait loci (QTL) previously described in the literature were found , three of these being related to reproductive phenotypes interval to first postpartum estrus , udder attachment and strength . These results suggest that the use of genomics tool was effective in the evaluation and analysis of thousands of SNPs present in the DNA of Nelore heifers phenotype of age at first calving , obtaining high density accurate genotypes . With the possible regions of QTLs for reproductive traits verification.