根据基于社区的繁殖计划,对埃塞俄比亚绵羊品种的繁殖特征进行遗传评估
Shanbel Besufkad1, Tesfaye Getachew2, Zelalem Abate3
1Debre Birhan Agricultural Research Center, Debre Birhan, Ethiopia.
概括
埃塞俄比亚的基于社区的育种计划应该平衡成长和生殖特征,以获得最佳的绵羊生产力. 选择奶时的子总重量显示出改善大多数品种的繁殖性能的前景.
科学领域:
- 动物遗传学和动物繁殖
- 生殖生物学 生殖生物学
- 农业科学 农业科学
背景情况:
- 埃塞俄比亚的社区基育种计划 (CBBPs) 主要关注生长特征,忽视生殖效率.
- 绵羊养殖的生产率受到生长和生殖表现的影响.
- 评估生殖特征的演变对于完善育种方案和管理实践至关重要.
研究的目的:
- 评估五种在CBBPs下管理的土著埃塞俄比亚绵羊品种的繁殖特征.
- 估计生殖特征的遗传参数及其与其他绩效指标的相关性.
- 为优化埃塞俄比亚绵羊生产的育种策略和管理实践提供见解.
主要方法:
- 使用SAS 9.4进行生殖特征的固定效应估计.
- 使用WOMBAT软件,使用多变量重复模型 (REML) 来估计遗传参数.
- 使用非重复的多变量模型,分析了第一次羊的年龄 (AFL).
主要成果:
- 在所有生殖特征中观察到出生年,母羊品种,平价和季节的显著影响.
- 繁殖特征,如子大小和子重量,通常在母羊平价到第七平价时得到改善.
- 对于生殖特征的直接遗传估计范围从低到中 (0.02-0.36),根据品种和位置而异.
结论:
- 选择奶时的子总重量 (TLWW) 可以对大多数品种的繁殖性能产生积极影响,除了Menz羊.
- 对生殖特征的遗传影响因品种和位置而异,需要特定环境的育种方法.
- 建议将基因选择与量身定制的管理相结合,包括在第七次平价后杀非生产性母羊,以实现可持续的CBBPs.
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