Our objective was to conduct a genome-wide association analysis (GWAS) for chicken body weight measured at 35 days (BW35). A large dataset of more than 43,000 broilers (meat-type poultry) from a commercial line with imputed 600,000 single nucleotide polymorphisms (SNPs) genotypes was analysed. Single marker regression was fitted with a genomic relationship matrix in the GEMMA software. Prior to GWAS, BW35 was adjusted for the non genetic effects of hatch, mating group, pen and sex. In total, 136 significant SNPs (P < 5´10-7) were identified across 7 Gallus gallus autosomes (GGA) and the Z chromosome. A sharp peak was detected on GGA4 at 67,440,745bp (P = 3.91´10-28; Gallus_gallus-4.0). Highly significant SNPs [-log10(P) > 10] were also found on GGA1 ( 142.7Mb), GGA2 ( 111.9Mb), GGA3 ( 49.82Mb) and the Z chromosome ( 68.6Mb). Keywords: body weight, broilers, genome-wide association study

Christos Dadousis, Adriana Somavilla, Paolo Gottardo, Andrew Whalen, David Wilson, Diarmaid De Burca, Andreas Kranis, John Hickey

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Methods and Tools - GWAS, , 561, 2018
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