泽西杂交牛的生殖和生产特征之间的遗传关系
Ishani Roy1, Mokidur Rahman1, M Karunakaran1
1ICAR-National Dairy Research Institute, Eastern Regional Station, Kalyani, 741235 West Bengal, India.
Gene
|November 13, 2023
概括
这项研究估计了新泽西杂交牛的生殖特征的遗传参数,例如第一次分娩的年龄和分娩间隔. 研究结果显示,生殖特征的遗传性很低,这表明环境因素对它们有很大的影响.
科学领域:
- 动物遗传学和动物繁殖
- 生殖生物学 生殖生物学
- 乳制品科学 乳制品科学
背景情况:
- 生殖效率对于乳牛生产率至关重要.
- 了解生殖特征的遗传参数是有效的育种计划的关键.
- 印度的泽西杂交牛为遗传研究提供了一个独特的种群.
研究的目的:
- 估计关键生殖特征的遗传参数:第一次分娩时的年龄 (AFC),分娩间隔 (CI),开放日 (DO) 和每次受孕服务数 (NSPC).
- 研究这些生殖特征与生产特征之间的遗传相关性 (305天的牛奶产量,总哺乳期的牛奶产量,哺乳期的长度).
- 为提高泽西杂交牛的生殖和生产性能的繁殖策略提供信息.
主要方法:
- 使用限制最大概率 (REML) 和贝叶斯式方法进行参数估计.
- 为生殖特征计算的遗传概率估计.
- 评估生殖和生产特征之间的遗传相关性.
主要成果:
- 对AFC,CI,DO和NSPC的遗传概率估计较低,从0.04到0.15不等.
- 低差异与CI,DO和NSPC的永久性环境影响有关.
- 在CI,DO,NSPC和生产特征之间观察到积极的遗传相关性,表明潜在的对抗性.
结论:
- 低遗传性表明,专注于非遗传因素的环境管理和选择策略对于提高生殖效率至关重要.
- AFC和牛奶产量特征之间的负遗传相关性是有利的,表明同时改善的潜力.
- 育种计划必须将繁殖特征的选择与生产特征相结合,以在泽西杂交牛中实现平衡的遗传收益.
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