Inbreeding coefficients were estimated using the diagonal elements of genomic matrix (FGRM), runs of homozygosity (FROH), and pedigree data (FPED) of a Nellore cattle population. Genotypic data were obtained using a panel of 700,000 SNPs, out of a total of 2,569 animals. The genomic matrix was calculated using the VanRaden (2008) formula and the runs of homozygosity were calculated using the Plink program. The noticeable peaks on chromosome 7, 12, and 21 present hotspots of autozygosity (> 40%) putatively hovering selective pressure. The pedigree had 1,535,678 animals. The mean values for FPED , FROH and FGRM were 0.48%, 6.05% and 0.96% respectively. Indicating that the pairings between relatives is reduced in this population. Using one mixed model we found a negative effect of FROH on postweaning weight gain, muscularity and conformation and a negative effect of FPED in the average weight gain. In the rest of the studied traits, we found no effect. Keywords: inbreeding depression, genomic relationship matrix, pedigree, runs of homozygosity

Gerardo C Mamani, Bruna Folegatti Santana, Gerson Oliveira, Jr., Elisângela Mattos, Ricardo V Ventura, Joanir Pereira Eler, Gota Morota, José Bento Ster Ferraz

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Species - Bovine (beef) 1, , 855, 2018
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