Linkage analysis was performed on 115 of the 117 progeny that were successfully genotyped at 5838 SNPs sites. A genetic map was constructed to order SNP markers used in association testing and served as graphical displays of the genome wide significant associated SNPs. The map construction was performed using the software Join-Map 2.0 . All SNPs that successfully “passed” a 1:2:1 or 1:1 segregation ratio test in the offspring, were used in the linkage analysis, assigned to linkage groups and ordered to determine map genetic distances in cM (centimorgans).