Comparative study on growth,reproductive performance,and serum indexes of hybrid offspring between Hu Sheep and Tibetan sheep versus their parental breeds in alpine pastoral areas

WEI Xiaoyan; YAN Binglian; LI Xiaoyan; ZHANG Kaidong; ZHANG Jinxue

doi:10.13557/j.cnki.issn1002-2813.2025.20.018

Abstract：This experiment aimed to investigate the performance of adaptability,growth and development,slaughter performance,and serum biochemical indexes of Hu sheep,Tibetan sheep,and their F1 hybrid lambs,thereby evaluating the improvement effect of crossbreeding Hu sheep with Tibetan sheep in alpine pastoral areas.The Hu × Tibetan hybrid F1 generation group(Hu × Tibetan group),purebred Tibetan sheep group(Tibetan sheep group),and purebred Hu sheep group(Hu sheep group)were established.Thirty male lambs approximately three months old,with similar body weight and developmental status,were selected from each group.Each group contained three replicates with 10 lambs per replicate.The pre-test period was 10 days,and the formal test period was 90 days.The results showed that the lambing rate of the Hu × Tibetan group was 21.15％higher than that of Tibetan sheep group,and the birth weight and weaning weight of Hu × Tibetan group were extremely higher than those of Tibetan sheep group(P＜0.01).The average daily gain of Hu × Tibetan group from three to six months of age was extremely higher than that of Tibetan sheep and Hu sheep groups(P＜0.01).At six months old,the chest width of Hu × Tibetan group was significantly greater than that of Tibetan sheep group(P＜0.05),the tail width was extremely smaller than that of Hu sheep group(P＜0.01),and the tail length was extremely longer than that of Hu sheep and Tibetan sheep groups(P＜0.01).The live weight before slaughter and carcass weight of Hu × Tibetan group were significantly higher than those of Tibetan sheep group(P＜0.05),the carcass fat content value(GR value)was significantly lower than that of Hu sheep group(P＜0.05),while no significant difference in eye muscle area among Hu × Tibetan,Tibetan sheep,and Hu sheep groups(P＞0.05).The serum total protein(TP),immunoglobulin A(IgA),and immunoglobulin G(IgG)concentrations of Hu × Tibetan group were significantly higher than those of Tibetan sheep group(P＜0.05).The study indicates that based on comprehensive evaluation of reproductive performance,growth performance,slaughter performance,and serum immune indexes,using Hu sheep to improve Tibetan sheep for meat production or breeding high-quality new meat sheep lines(breeds)has significant advantages.