[Objective] The aim of the research was to identify and assess the genetic characteristics of grading breeding sheep populations in Ba Yan Nur City. [Method] Genetic polymorphism and aggregation of seven sheep populations, including three breeding sheep populations (breeding F1, F2 and Bamei mutton sheep), three introduced mutton sheep breeds (Texel, Dorset and German Merino sheep) and one local female parent population (Mongolia sheep), were assessed using 10 microsatellite markers. [Result] By cluster analysis, the seven sheep populations can be divided into two groups. The F1 and German Merino sheep were closely related, which were clustered with F2, Bamei mutton sheep and Mongolia sheep to form one group while Texel and Dorset to form another group. The genetic aggregation of the seven breeds was assessed by Bayesian discrimination. And the results show that the genetic aggregation of F1 and F2 were lower while that of Bamei mutton sheep, Texel, Dorset and German Merino sheep were higher. [Conclusion] Better genetic stability has been formed in Bamei mutton sheep.
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