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羊的生长曲线特征的遗传参数在不确定的父亲身份下在牧场里养的羊

M Balafrej¹, M Fagroud², M T Sraïri³

¹Ministry of Agriculture, Production Chains Development Directorate, Rabat, Morocco. balafrejmed@hotmail.com.

Tropical animal health and production

|January 8, 2024

概括

使用Von Bertalanffy模型参数改进蒂马赫迪特羊的繁殖方法可以提高遗传选择. 这种方法解决了不确定的亲属关系,提高了料效率和农场利能力.

科学领域:

动物遗传学动物遗传学
量化遗传学量化遗传学
羊的繁殖羊的繁殖

背景情况:

提马迪特羊的品种改进对于农业生产率至关重要.
牧民制度往往会带来一些挑战,因为父母的血统不确定.
准确的遗传参数估计对于有效的育种计划至关重要.

研究的目的:

使用Von Bertalanffy模型参数来增强Timahdit羊的选择程序.
在遗传分析中纳入处理不确定的父亲身份的方法.
改善增长曲线特征和整体农场利能力.

主要方法:

使用了一个大型数据库 (12,029只动物) 和血统文件 (48,292只动物).
通过非线性回归 (SAS Proc NLIN) 估计了·贝塔兰菲模型参数.
解决了不确定的父权问题,使用了平均计数器关系矩阵模型 (ANRM) 的 R 代码.
使用贝叶斯方法 (BRMS包) 估计的方差和 (共方差) 组件.

主要成果:

获得了研究参数的高遗传性估计值 (0.52-0.55),表明强大的遗传反应潜力.
确定了参数之间的正相关性,表明快速发展可能与较低的体重性能相关.
通过遗传选择证明了改善生长曲线特征的可行性.

结论:

高遗传性支持蒂马赫迪特羊的持续遗传进步,即使在不利的条件下.
基于遗传值的最佳选择可以修改生长曲线,以获得更快,更高的体重增加.
改善生长特征可以提高料效率,提高绵羊养殖的利能力.

关键词:

贝叶斯的推理贝叶斯的推理遗传性遗传性是可以继承的.时间是羊的时间.不确定的父亲身份.·伯塔兰菲的模型

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