Studies On The Relationships Between Polymorphisms Of Sows Locus For RYR Gene And Its Traits

In this experiment,RYR gene polymoiphisms were detected by methods of PCR-RFLP in three breeds(Landrace, Duroc and Yorkshire).The analyzis of the TNB, LEW, LWT28, the backfat thickness, ND and the RYR gene were carried out. According to the population genetic structure the RYR gene of n - allele frequencies were higher in Duroc and Yorkshire ,but was completely absent in Landrace. As to the RYR gene.there were only NN and Nn genotypes but no homozygous nn in three breeds (Landrace, Duroc and Yorkshire). Average TNB differed significantly within different RYR genotypes . In the Yorkshire,the TNB of Nn genotype was 1.7045 more than that of NN genotype in first groups. In the Duroc,the TNB of Nn genotype was 2.5758 more than that of NN genotype in first groups. In latter groups ,the findings were 0.3898 and 0.9956. Average the backfat thickness differed significantly within different RYR genotypes .The backfat thickness of Nn genotype was thicker than that of NN genotype. However,the springs' LWT28 of NN genotype was more than that of Nn genotype. The ND of NN genotype was more than that of Nn genotype. Especially in the experimentation,There was no ND in those pigs of Nn genotype .Those results indicated that RYR gene affects TNB, ND, Thebackfat thickness, LWT28 and show no ill-effect on LBW in the pork.Conclusion drawn from this research illustrated that marker-assisted selection(MAS) using RYR is increasing TNB,LWT28 and disincreasing ND. It will be of considerable economical value to the pork producers. In swine population magnitude of population performance could increase obviously with n-allele of the RYR gene frequency accumulating.