Research article - Peer-reviewed, 2015
Estimates of genetic variance and variance of predicted genetic merits using pedigree or genomic relationship matrices in six Brown Swiss cattle populations for different traitsLoberg, Anne; Dürr, Joao; Fikse, Freddy; Jorjani, Hossein; Crooks, L.
AbstractThe amount of variance captured in genetic estimations may depend on whether a pedigree-based or genomic relationship matrix is used. The purpose of this study was to investigate the genetic variance as well as the variance of predicted genetic merits (PGM) using pedigree-based or genomic relationship matrices in Brown Swiss cattle. We examined a range of traits in six populations amounting to 173 population-trait combinations. A main aim was to determine how using different relationship matrices affect variance estimation. We calculated ratios between different types of estimates and analysed the impact of trait heritability and population size. The genetic variances estimated by REML using a genomic relationship matrix were always smaller than the variances that were similarly estimated using a pedigree-based relationship matrix. The variances from the genomic relationship matrix became closer to estimates from a pedigree relationship matrix as heritability and population size increased. In contrast, variances of predicted genetic merits obtained using a genomic relationship matrix were mostly larger than variances of genetic merit predicted using pedigree-based relationship matrix. The ratio of the genomic to pedigree-based PGM variances decreased as heritability and population size rose. The increased variance among predicted genetic merits is important for animal breeding because this is one of the factors influencing genetic progress.
KeywordsBrown Swiss cattle; genetic variance; genomic relationship matrix
Published inJournal of Animal Breeding and Genetics
2015, volume: 132, number: 5, pages: 376-385
Dürr, Joao (Dürr, Joao)
Sheffield Diagnostic Genetics Service (SDGS)
UKÄ Subject classification
Genetics and Breeding
URI (permanent link to this page)