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Linkage maps of Sus scrofa chromosome 5 (SSC5) were constructed using up to 10 markers in three informative F2 families based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The map lengths differed among the families. In the M × P family, the MYF5 locus was linkage mapped between SW995 and SW967. Relatively few quantitative trait loci (QTLs) were observed on SSC5 explaining a maximum of 5.8% of phenotypic variance in the F2 generation. The presence and position of QTLs were not consistent among families. The Meishan and Wild Boar QTL allele effects were inferior compared with Pietrain allele effects. The additive effects were small and reasonably strong dominance-effects were observed. QTLs affecting conductivity in the W × M family and food conversion ratio in the M x P family mapped near MYF5, while the QTL affecting conductivity in the M x P family was located near IGF1. [ABSTRACT FROM AUTHOR]

Sus scrofa chromosome 2 (SSC2) linkage maps were generated from three F2 families involving Meishan (M), Pietrain (P) and Wild Boar (W) crosses and the same 10 marker loci. SSC2 linkage maps were similar between families and correspond to published maps. Quantitative trait loci (QTLs) for carcass traits, daily gain and heart weight were identified on SSC2, especially in the intervals 0-20 and 80-90 cM in the M × P family, the intervals 20-50 and 125-140 cM in the W × P family, and the interval 15-70 cM in the W × M family. QTL presence and position varied among families. QTL effects explained up to 10% of F2 phenotypic variance. Pietrain QTL alleles were associated with high muscle and heart mass, high daily gain and low fat deposition and Meishan alleles with high carcass fat content. Wild Boar alleles were associated with leaner carcass but lower daily gain than Meishan alleles. [ABSTRACT FROM AUTHOR]