Linkage and QTL mapping for Sus scrofa chromosome 9

Linkage and QTL maps of Sus scrofa chromosome 9 (SSC9) were constructed using 16 markers, with 13 to 15 used in three F-2 families based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The LPR and SLN loci were integrated into the linkage map of SSC9 for the first time. Only a few quantitative trait loci (QTLs), explaining up to 5.1% of the F-2 phenotypic variance, were identified on SSC9 with chromosome-wide significant effects on growth and fattening in the W x P family and on weight of liver, growth and fat-to-meat ratio in the W x M family. No QTLs were found in the M x P family. Gene effects were mainly dominant in the W x P family. In the W x M family, Wild Boar QTL alleles for weight of liver were superior over Meishan alleles.