Genetic structure of grading crossing groups in two meat sheep breads by microsatellite marker technology
The polymorphism of 10 microsatellite loci was analyzed in the Dorset and Suffolk meat sheep breads and their grading crossing offsprings(filial generation one and two,F_1 and F_2),crossed with Xinjiang Fine Wool.Allele frequencies,effective number of alleles,heterozygosity,polymorphism information content,genetic distance were calculated for all microsatellite markers in each group.The number of allele observed at a locus varied between five and thirteen and effective number of alleles was more than 3.529.The evaluated microsatellite markers exhibited a very high heterozygosity(H0.7167) and polymorphism information content(PIC0.6648).These genetic parameters all exceeds that in grading crossing offsprings(F_1).Genetic relationship between Dorset or Suffolk and its grading crossing offsprings F_2 is closer than its grading crossing offsprings F_1.