Following a similar approach of Gibbs et al. (2009) and Kijas et al. (2012), significant genomic regions were defined as those that harbor at least one significant SNP (top 0.1%) flanked by a set of five or more adjoining SNPs in the top 1%. The genomic positions of the significant regions were defined by the first and last of the top 1% SNP in the cluster. In addition, multiple clusters localized in close proximity (∼1 Mb) were considered as a single significant genomic region.