平价差异对霍尔斯坦牛的剩余料摄入量估计的影响
Ligia Cavani1, Kristen L Parker Gaddis2, Ransom L Baldwin3
1Department of Animal and Dairy Sciences, University of Wisconsin, Madison 53706.
JDS communications
|June 26, 2023
概括
在乳牛的剩余料摄入 (RFI) 模型中,嵌套能耗在平价范围内下降,改善了模型的合适性. 然而,这种精细化对料效率的估计育种值的影响很小.
科学领域:
- 动物科学动物科学
- 遗传学 遗传学 是一个
- 乳牛生产 乳牛生产
背景情况:
- 剩余料摄入量 (RFI) 是牲畜料效率的一个关键指标.
- 对于乳牛繁殖计划来说,了解对等数 (哺乳期数) 对RFI估计的影响至关重要.
- 当前的RFI模型可能无法完全考虑平价特异性的生物变异.
研究的目的:
- 评估可替代的RFI模型,以考虑哺乳乳期奶牛的平价.
- 为了比较RFI模型,其中能量沉降器是嵌套的,而不是嵌套在平价范围内.
- 通过不同的平价来估计RFI的遗传参数.
主要方法:
- 利用了来自5个美国研究站的5,813只霍尔斯坦牛的72,474个每周RFI记录 (2007-2022).
- 采用两变重复性动物模型来估计遗传性,重复性和遗传相关性.
- 通过使用合适度统计和等级相关性来比较嵌套和非嵌套的RFI模型.
主要成果:
- 与非嵌套模型相比,嵌套的RFI模型显示出更高的合适度.
- 观察到平价之间能量沉降的回归系数存在显著的异质性.
- 在两种模型中的RFI和繁殖值之间发现了高斯皮尔曼的等级相关性 (0.98-0.99).
- 对于RFI的遗传概率估计增加了平价 (0.16到0.22).
- 对RFI的重复性估计一直很高 (0.51-0.57).
结论:
- 在平价范围内嵌套能量吸收器可以提高RFI模型在哺乳乳奶牛中的统计匹配度.
- 尽管改进了模型匹配,但对RFI估计的繁殖值的实际影响是最小的.
- 这些发现支持使用具有平价意识的RFI模型来对乳牛进行更准确的遗传评估.
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