The use of markers-derived metrics has been suggested to infer relative inbreeding from the homozygosity of markers. Automated genotyping systems yield accurate genotypes of multiple SNPs which are useful markers for this goal. In the present study, 322 pigs of the Torbiscal closed strain of Iberian pigs have been genotyped for 192 selected SNPs, using the GoldenGate Genotyping Assay. The animals proceed from 56 litters born from minimum or maximum coancestry matings. Inbreeding coefficients were calculated from the complete pedigree (FG), the molecular homozygosity of 168 available SNP genotypes (F168SNP) or inferred from the molecular homozygosity (FG / 168SNP). Weight at 90 days and daily gain data were available for each pig. The effects on growth performance of these coefficients were analyzed in a Bayesian framework via Gibbs sampling. Inbreeding depression, expressed as the performance decrease relative to the mean, per 10% of increase of each inbreeding coefficient, was -0.85, -1.21 and -0.71% for weight at 90d, and - 3.78, -3.91 and -2.24% for daily gain, respectively. In absence of good quality pedigree, inbreeding effects could be predicted using marker-based coefficients.
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