Study On Blood Protein Polymorphism And Marked Character Of Tan-sheep In Gansu

Polvacrylamide gel electrophoresis (PAGE) was used to analyse the genetic polymorphism of 7 blood protein loci which were hemoglobin (Hb), transferrin (Ti). albumin (Alb). erythrocyte protein I and 2 (Ep-I,Ep-2) .arylesterase (Es) and a -arnvlase (a -Amy) in 3 Tan-sheep populations sampled from Gaolan County. Jingtai County and Jingyuan County of Gansu Province to study their genetic variations and differentiations. Meanwhile. correlationship of blood polymorphism and 2 economic traits, body-weight and body-size, were analysed. We found polymorphism only at loci of Hb,Tf and Es and monomorphism at other 4 loci. Nei's average gene heterozygosity (K) of 3 Gansu Tan-sheep populations were 0.2037. 0.2021 and 0.2254 respectively along with the average genetic diversity (GcT~ and genetic differentiation (DcD of total Tan-sheep population were 0.0019. 0.0090 . The results indicate that there is little variation (0.9%) among Gansu Tan-sheep and the genetic differentiation is very limited between Gansu Tan-sheep populations. Hb and Es have significant correlationship with body-weight and body-size, HbAA and Es++ are the best genotypes to be assistant marker to improve meat production of Gansu Tan-sheep.