Study On The Reproductive Ability And Performance Of Different Hybrid Progeny Ewes Of Suffolk And Hu Sheep

The hybrid progeny ewes of Suffolk and Hu Sheep were selected to observe their reproduction performance,FecB genes in those ewes were detected,and their lambing results and the growth and development data in different generations lambs were recorded.1.The synchronous estrus rates of F₁ and F₂ generations were 97.23%and 95.83% respectively,and the synchronous estrus and pregnancy rate of estrus of F₁ generations were better than that of F₂ generations as well.2.The average lambing rate of F₁ generations was higher than that of F₂ generations, there were more wild-type gene ewes than fecundity gene ewes in F₂ generations.Some special characteristics of Hu Sheep began to isolate.Following the advance of hybridization, the occurrence frequency of B+ and B in ewes significantly went down,and that of ++ and + went up.This indicated that the lambing rate of next generations would significantly decrease following the advance of hybridization.3.The gaining weight of F₁ hybrid lambs in 60,75,90,105,120 days were significantly higher than that of Hu Sheep lambs in same ages(P＜0.05).4.The growth and development of different genet-type of FecB in F₂ and F₃ hybrid generations were different.The average lambing rate of ewes with fecundity genes was higher than that of ewes with wild type genes,whereas,the average lambing and weaning weight of ewes with fecundity genes were lower than that of ewes with wild type genes.