Abstract：To study the genetic polymorphism and nomenclature of Mingguang small-ear pig(MG), Diannan small-ear pig(DN) and Bama xiang pig(BM), the polymorphic parameters were calculated using eighteen microsatellites (MS) in swine leukocyte antigen complex (SLA). The genetic parameters, including the observed heterozygosity(Ho), expected heterozygosity (He) and the polymorphism information content (PIC), were studied in three breed miniature pigs and Yunnan wild boar(YWB, Sus scrofa silvianus). The haplotypes, clustering and principal component (PC) analysis were further studied to elucidate the relationship in three breed miniature pigs. The results showed that the PIC of Yunnan wild boar was highest (0.694) versus Bama xiang pig was lowest(0.585), these breed miniature pigs were highly polymorphic. There were twelve and fourteen kinds of haplotypes in the regions of SLAⅠandⅡ, respectively. Four shared haplotypes were found among Mingguang small-ear pig, Diannan small-ear pig and Yunnan wild boar, only one haplotype was detected between Bama xiang pig and Mingguang small-ear pig. Comparison with Bama xiang pig, the relationship was close in Mingguang small-ear pig, Diannan small-ear pig and Yunnan wild boar by the clustering and PC analysis. These results suggest that Mingguang small-ear pig can belong to Diannan small-ear pig, because they are shared similar genetic background, this study gives us a molecular evidence for the synonym issue.
