02202naa a2200217 a 450000100080000000500110000800800410001902200140006002400420007410000160011624501080013226000090024050000690024952015000031865000330181865000100185170000160186170000160187770000190189377300720191210128432019-10-15       2012    bl uuuu     u00u1 u    #d  a0931-26687 a10.1111/j.1439-0388.2011.00939.x2DOI1 aSIMEONE, R.  aEvaluation of a multi-line broiler chicken population using a single-step genomic evaluation procedure.  c2012  aArticle history: Received: 26 July 2010 / Accepted: 4 June 2011.  aABSTRACT.  Effects on prediction of analysing a multi-line chicken population as one line were evaluated. Body weight records were provided by Cobb-Vantress for two lines of broiler chickens. Phenotypic records for 183695 and 164149 broilers and genotypic records for 3195 and 3001 broilers were available for each line. Lines were combined to create a multi-line population and analysed using a single-step procedure combining the additive relationship matrix and the genomic relationship matrix (G). G was scaled using allele frequencies from each line, the multi-line population, or 0.5. When allele frequencies were calculated from each line, distributions of diagonal elements were bimodal. When allele frequencies were calculated from the multi-line population, the distribution of diagonal elements had one peak. When allele frequency 0.5 was used, the distribution was bimodal. Genomic estimated breeding values (GEBVs) were predicted using each allele frequency. GEBVs differed with allele frequency but had ≥0.99 correlations with GEBVs predicted with correct allele frequencies. Means of each line and differences in mean between the lines differed based on allele frequencies. Assumed allele frequencies have little impact on ranking within line but larger impact on ranking across lines. G may be used to evaluate multiple populations simultaneously but must be adjusted to obtain properly scaled estimates when population structure is unknown.  © 2011 Blackwell Verlag GmbH.  aMEJORAMIENTO GENETICO ANIMAL  aPOLLO1 aMISZTAL, I.1 aAGUILAR, I.1 aVITEZICA, Z.G.  tJournal of Animal Breeding and Genetics, 2012gv.129, no.1, p.3-10.