Gansu meat sheep new breed population (204)and Poll Dorset(32) which come from Yongchang meat breeding farm of Gansu province were studied as experimental material. Polymorphisms of Growth differentiation factor(GDF9)gene, Bone morphogenetic protein 15(BMP15)gene and Gonadotropin releasing hormone receptor(GnRHR) gene were detected, The polymorphisms of exonl & exon2 of GDF9, exon2 & exon3 of GnRHR and exon1&exon2 of BMP 15 in new breed population sheep were analyzed by PCR-SSCP. We attempt to find the link...