Research on application effect in breeding of molecular marker in sheep BMPR-IB gene.

【Objective and Method】The polymorphism of bone morphogenetic protein receptor type IB gene(BMPR-IB gene) of 204 sheep of three breeds or strains,which included Small Tail Han sheep,F1 generation from German Merino(♂)×Small Tail Han sheep(♀) cross generation(DF1),German Merino,was analyzed by PCR-sscp.The relationship between genotype and litter size was also identified.【Result and Conclusion】The results showed that the frequency of B allele in Small-Tail Han sheep,German Merino and DF1 was 0.660,0.532 and 0.600,there was no significant difference of distribution of gene frequency and genotype frequency in 3 groups.The litter size of BB,B+ and ++ was 2.86,2.27 and 2.08,BB were both significantly higher than B+ and ++(P0.05),and B+ were significantly higher than ++ type.