【摘要】 [目的]分析夷陵绵羊繁殖性能，了解其产能现状，为进一步选育提供参考依据。[方法]利用夷陵绵羊核心育种场的繁殖记录，系统分析夷陵绵羊繁殖性能及变化规律，探究胎次和季节对产羔性能的影响，并依据繁殖性状与其他20个绵羊品种进行聚类分析。[结果]经过4个世代的选育，目前夷陵绵羊平均产羔间隔230 d，平均胎产羔数2.3只，平均胎产活羔数2.0只。产羔数随胎次增加呈现先上升后下降的变化趋势，第1胎最低，第4～5胎达到峰值。夷陵绵羊全年产羔，但季节对产羔数有显著影响，春季产羔数最多，且显著高于其他3个季节。21个绵羊品种聚类为2个类群，夷陵绵羊与其母本小尾寒羊和湖羊等高繁品种聚为一类。[结论]夷陵绵羊四季产羔，繁殖性能优良，具有良好的均衡生产潜力。更多还原

【Abstract】 [Objectives] The reproductive performance of Yiling sheep was analyzed and its current production capacity was understood to provide reference basis for the further breeding of Yiling sheep.[Methods] The reproduction records of Yiling sheep core breeding farm were used to systematically analyze the reproductive performance and changing rules of Yiling sheep. The effects of parity and season on lambing performance were studied. Cluster analysis was conducted based on reproductive traits and other 20 sheep breeds. [Results] The average lambing interval of Yiling sheep wass 230 days, with an average litter size of 2.3 and an average live litter size of 2.0 after four generations of breeding. The number of lambs showed a trend of first increasing and then decreasing with the increase of parity, with the first fetus being the lowest and the 4th to 5th fetus reaching its peak. Yiling sheep produced lambs throughout the year, but the season had a significant impact on the number of lambs produced. The number of lambs produced in spring was the highest, significantly higher than that in the other three seasons.21 sheep breeds were clustered into 2 groups, with Yiling sheep and its mother breeds such as small-tailed Han sheep and Hu sheep clustered into one group. [Conclusions] Yiling sheep produce lambs throughout the year, with excellent reproductive performance and good potential for balanced production.更多还原