摘要
对湖羊繁殖性能和羔皮品质的四个性状作了遗传与表型参数的分析.结果表明,湖羊的平均产羔数为2.32头,羔羊初生重为2.49kg,荐部毛长为1.81cm,羔皮等级的评分平均为8.34分,甲乙级羔皮的比例占84.8％.遗传力的估计表明,产羔数的遗传力较低,为0.103,羔羊初生重为0.292,荐部毛长为0.647,羔皮等级为0.419.产羔数与羔羊初生重、产羔数与荐部毛长呈负遗传相关(r分别为-0.67和-0.46);产羔数与羔皮等级呈正遗传相关(r=0.76);荐部毛长对羔皮等级有极显著影响,两者的遗传相关为-0.96,降低毛长可明显提高羔皮等级.
Studies have been conducted to estimate the genetic and phenotypic parameters of 4 traits in Taihu Sheep concerning its prolificacy and lambskin quality. Results show that the average litter size (LS) is 2.32, the lamb birth weight ( BW) 2.49kg, the wool length on hip cross (WL) 1.81 cm and (he score of skin quality (SQ) 8.34. The excellent and good skins account for 84.8% of all skins examined. The heritabilitis of the traits are 0.103 for LS, 0.292 for BW ,0.647 for WL and 0.419 for SQ, indicating that the prolificacy of the sheep has a low heritability, but the skin quality has a high heritability. Negative genetic correlations exist between LS and BW(r=-0.67), and between LS and WL(r=- 0.46) . The genetic correlation between LS and SQ is positively high(r=0.76) .WL is strongly correlated with SQ(r=-0.96) . This suggests that reducing wool length could significantly improve lambskin quality.
关键词
湖羊
繁殖
遗传力
羔皮
sheept prolificacy
lambskin quality
heritabilitiess correlations
