Abstract
The variations of blood groups in the two subspecies of wild pigs in Japan (Sus scrofa leucomystax and S.s. riukiuanus) were investigated by serological techniques. S.s. leucomystax showed polymorphism in the A and F systems. S.s. riukiuanus showed a little polymorphism in the F system only. As a whole, there was a great similarity in erythrocyte antigen structures of both S.s. leucomystax and S.s. riukiuanus. In comparison with the erythrocyte antigen frequenties of wild pigs in the Eurasian Continent reported by other workers. East-West geographical clines in the frequencies of Ea, Fa, Ga, Ka, Kb and Lh antigens were clearly observed. From the results of investigation on genetic similarities among seven wild pig populations, it was made clear that the two Japanese strains were very close and were closer to Far Eastern TS.s. ussuricus) than Middle Asian (S.s. nigripes), Transcausian (S.s. attila) and European pigs (S.s. ferus).
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