Polymorphism of the ESR, PRLR, LH and RYRI Genes in the Four Pig Populations

Polymorphism in Estrogen Receptor α (ESR), Prolactin Receptor (PRLR), Luteinizing Hormone β (LH) and the Ryanodine Receptor I (RYRI) genes, which play important roles in litter size of pigs, were analysed in four pig populations (Min, Landrace, York-shine, Duroc) using PCR-SSCP. There was one SNP in ESR (Arg/His488), two SNPs in PRLR (one silent mutation and Val/Ala555) and two silent mutations each in LH and RYRI. PRLR was highly polymorphic locus (0.59≥PIC≥0.46), LH and RYRI were moderately polymorphic loci (0.36≥PIC≥0.15) and ESR was very low polymorphic locus (0.07≥PIC≥0.00).