AUTHOR=Pimentel Eduardo da Cruz Gouveia , Erbe Malena , Koenig Sven , Simianer Henner TITLE=Genome Partitioning of Genetic Variation for Milk Production and Composition Traits in Holstein Cattle JOURNAL=Frontiers in Genetics VOLUME=2 YEAR=2011 URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2011.00019 DOI=10.3389/fgene.2011.00019 ISSN=1664-8021 ABSTRACT=
The objective of this study was to estimate the contribution of each autosome to genetic variation of milk yield, fat, and protein percentage and somatic cell score in Holstein cattle. Data on 2294 Holstein bulls genotyped for 39,557 autosomal markers were used. Three approaches were applied to estimate the proportion of genetic variance attributed to each chromosome. In two of them, marker-derived kinship coefficients were computed, using either marker genotypes observed on the whole genome or on subsets relative to each chromosome. Variance components were then estimated using residual maximum likelihood in method 1 or a regression-based approach in method 2. In method 3, genetic variances associated to each marker were estimated in a linear multiple regression approach, and then were summed up chromosome-wise. Generally, all chromosomes contributed to genetic variation. For most of the chromosomes, the amount of variance attributed to a chromosome was found to be proportional to its physical length. Nevertheless, for traits influenced by genes with very large effects a larger proportion of the genetic variance is expected to be associated with the chromosomes where these genes are. This is illustrated with the