评估印度Saanen × Beetal山羊早期选择的第一平价生殖特征的遗传参数
Shweta Sahoo1, Rani Alex1, Vikas Vohra1
1Department of Animal Genetics and Breeding, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
Reproduction in domestic animals = Zuchthygiene
|July 15, 2024
概括
用动物模型评估了Saanen × Beetal山羊生殖特征的遗传参数. 低遗传性表明遗传改善有限,但负相关性为经济特征提供间接选择潜力.
科学领域:
- 动物遗传学和动物繁殖
- 牲畜中的生殖生理学
背景情况:
- 了解生殖特征的遗传参数对于提高山羊生产率至关重要.
- 桑恩·比塔尔 (S·B) 羊品种对肉类生产很重要.
研究的目的:
- 为了评估Saanen × Beetal山羊的第一夫妻生殖特征的遗传参数.
- 评估基因改进的潜力,并确定选择策略.
主要方法:
- 从1973年到2020年使用了762份生殖记录.
- 采用单特征和多特征动物模型,包括吉布斯采样 (GSAM).
- 偏差信息标准 (DIC) 选择了最适合的模型.
主要成果:
- 估计的最小平方值是对诸如第一次开玩笑的年龄 (662.96天) 和出生孩子的数量 (1.27) 等特征的平均值.
- 生殖特征的遗传概率估计一般很低,这表明直接基因改进的范围有限.
- 发现干旱期/服役期和子重量/出生小孩数量之间存在有利的负遗传相关性.
结论:
- 由于遗传性较低,S × B山羊对这些生殖特征的直接遗传改进具有挑战性.
- 通过服务/干燥期和繁殖特征之间的负相关性间接选择提供了一个可行的策略.
- 基因改进工作可以通过利用品种的繁殖潜力来提高肉类行业的未来.
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