霍尔斯坦牛干物质摄入的一致性:遗传性估计和与料效率的关联
Ligia Cavani1, Kristen L Parker Gaddis2, Ransom L Baldwin3
1Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.
Journal of dairy science
|September 28, 2023
概括
奶牛的干物质摄入 (DMI) 稳定性是遗传的,可以表明弹性. 具有稳定的DMI的奶牛更有效地料,并且在挑战期间更好地保持表现.
科学领域:
- 动物科学动物科学
- 遗传学 是一个遗传学.
- 乳牛生产 乳牛生产
背景情况:
- 性对于奶牛的表现和福祉至关重要.
- 研究每日干物质摄入量 (DMI) 的波动为识别弹性奶牛提供了一种新的方法.
- 现有的遗传评估可能无法完全捕捉弹性特征.
研究的目的:
- 在荷尔斯坦牛中开发DMI一致性的新表型.
- 估计DMI一致性与料效率和牛奶产量一致性的遗传参数和相关性.
- 评估DMI的一致性与生产,寿命,健康和生殖特征之间的关系.
主要方法:
- 从使用各种回归模型的每日DMI偏差计算一致性表型 (log-Var-DMI).
- 使用动物模型估计遗传参数和相关性.
- 通过斯皮尔曼的等级相关性,评估与国家遗传评估特征的关系.
主要成果:
- 在不同模型中,DMI的一致性 (log-Var-DMI) 是可遗传的 (h2 ≈ 0.11-0.14).
- 不同DMI一致性计算方法 (0.94-0.99) 之间存在强烈的遗传相关性.
- 发现与牛奶产量和料效率特征的中等积极遗传相关性,以及与女性生育能力的负相关性.
结论:
- DMI的一致性是一种遗传性特征,也是乳牛弹性的潜在指标.
- 具有一致的DMI的奶牛表现出更好的料效率,并且可能更适应干扰.
- DMI的一致性为旨在提高弹性的乳牛育种计划提供了一个有希望的新特征.
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