Adopting Polymerase Chain Reaction-Restrain Fragment Length Polymorphism (PCR-RFLP),the genetic variation of Hormone-sensitive lipase(HSL) gene exon I and Melanocortin-4 Receptor (MC4R) gene were detected in 659 pigs including 7 population (Duroc, Landrace, Yorkshire, LY, Ningxiang, Shaziling, Daweizhi),then genotype frequencies and gene frequencies were counted according to the PCR-RFLPs and the distribution of genotype frequencies in the population were analyzed by Chi Square Test. The effects of MC4R gen...