Records for carcass weight (CW), rib eye area (REA), backfat thickness (BFT), and marbling (MARB) were recorded for 1,594 Nellore males (821 genotyped). The single-step GBLUP approach was used to estimate (co)variance components by REML using a multi-trait model including the effects of contemporary group, direct additive genetic, and slaughter animal age. A Manhattan plot of the variance explained by 50 adjacent SNP windows was used to assess potential genome regions with major effects on each trait. Low heritability was verified for all traits and genetic correlations were moderate among REA, BFT, and MARB, and were low between them with CW. The highest genome association were found on chromosome 1 and 5 for CW, on 5 for REA, on 8 and 14 for BFT, and on 5, 6, 14, and 16 for MARB, which represent potential genome regions harboring genes affecting the traits.

Gerardo AFernand Júnior, Guilherme JM Rosa, Raphael B Costa, Roberto Carvalheiro, Luis Artur Loyo Chardulo, Daniel GM Gordo, Fernando Baldi, Henrique N Oliveira, Humberto Tonhati, Lucia Galvão Albuquerque, Rafael MO Silva

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Selection using molecular information (Posters), , 504, 2014
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