估计的遗传参数的反时间,料效率和甲生产特征在第一次哺乳荷尔斯泰因奶牛
L S F Lopes1, F S Schenkel1, K Houlahan1
1Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada, N1G 2W1.
Journal of dairy science
|February 4, 2024
概括
化时间 (RT) 与乳牛的甲产量 (MeP) 和牛奶特征有遗传联系. 这一发现可能有助于对料效率和排放的基因评估,尽管需要更多数据来确认.
科学领域:
- 动物遗传学动物遗传学
- 乳制品科学 乳制品科学
- 环境科学 环境科学
背景情况:
- 对基因改进计划来说,大规模记录料效率 (FE) 和甲排放 (ME) 是一个挑战.
- 与FE和ME相关的遗传性状可能有助于遗传评估.
- 化时间 (RT) 是一个与 FE,甲生产 (MeP) 和生产特征相关的潜在指标特征.
研究的目的:
- 研究Holstein牛的反时间 (RT),料效率 (FE),甲产量 (MeP) 和生产特征之间的遗传关系.
主要方法:
- 利用了来自656只初哺乳期荷尔斯坦牛的7358份记录.
- 估计RT,MeP,FE和牛奶生产特征的遗传性和遗传相关性.
- 定义FE为DMI回归的剩余值在能量校正的牛奶和代谢体重上.
主要成果:
- 对于RT,MeP和牛奶生产特征发现了适度的遗传性.
- 在RT和MeP之间观察到显著的负遗传相关性 (-0.53±0.24).
- 在RT和能量校正牛奶 (0.49±0.11) 之间发现了显著的正基因相关性.
- RT和FE之间的遗传相关性并不显著 (-0.01 ± 0.17).
结论:
- 化时间 (RT) 与甲生产 (MeP) 和牛奶生产特征有遗传关联.
- RT显示了作为一种间接选择标准的潜力,用于改善乳牛的FE和降低乳牛的MeP.
- 建议使用更大的数据集进行进一步的研究,以确认这些遗传关联,特别是FE.
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