卵细胞和胚胎生产的遗传参数及其与Gyr奶牛线性类型特征的关联
Andréia Ferreira Machado1, Renata de F Bretanha Rocha2, Rafael Monteiro Dos Santos3
1Department of Animal Science, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil, 36570-900; Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS 66506.
Journal of dairy science
|July 27, 2024
概括
在奶牛Gyr中进行体外胚胎生产的基因选择是可行的. 专注于卵细胞特征,特别是可活卵细胞,可以加速胚胎生产计划的遗传进步.
科学领域:
- 动物育种与遗传学
- 生殖生物学 生殖生物学
- 乳牛生产 乳牛生产
背景情况:
- 试管胚胎生产 (IVEP) 对于乳牛基因改进至关重要.
- 在历史上,四十年来,线性类型特征一直指导着吉尔牛的选择.
- 了解IVEP和类型特征之间的遗传联系可以增强育种策略.
研究的目的:
- 在Gyr牛中估计卵细胞产量和IVEP的遗传参数.
- 调查IVEP特征和线性类型措施之间的遗传和表型关联.
- 为优化乳牛Gyr育种计划中的遗传选择提供见解.
主要方法:
- 应用了一种可重复性模型,对来自1916名Gyr捐赠者的14251个卵子采集事件进行了测试.
- 分析了604名Gyr捐赠者的体型测量,使用单特征和双特征分析.
- 使用BLUPF90软件家族进行遗传参数估计.
主要成果:
- 总卵细胞,可活卵细胞和胚胎的遗传性估计分别为0.38,0.34和0.20.
- 在卵细胞计数 (0.99) 和卵细胞与胚胎 (0.83) 之间发现了高度的遗传相关性.
- 在IVEP特征和线性类型特征之间存在适度的遗传相关性 (0.07-0.42),例如阴茎宽度和部区域.
结论:
- 在Gyr奶牛中,可以实现改善体外胚胎生产的选择.
- 优先选择基于卵细胞特征,特别是可活卵细胞,可以推动优越的遗传进步.
- 线性类型的特征,特别是阴茎的宽度,为提高IVEP提供了间接选择的潜力.
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