乳头形状特征的遗传参数来自北美霍尔斯坦牛的机器人挤奶系统产生的笛卡尔坐标
Gabriel C Medeiros1, Jose Bento S Ferraz2, Victor B Pedrosa3
1Department of Veterinary Medicine, College of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, SP, 13635-900, Brazil; Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
Journal of dairy science
|May 18, 2024
概括
用自动挤奶系统 (AMS) 进行对霍尔斯坦牛乳液构造的基因组选择,显示了乳液深度和前乳距离等特征的中度至高遗传性. 这些发现支持对更适合AMS环境的奶牛进行繁殖.
科学领域:
- 动物遗传学和动物繁殖
- 乳制品科学 乳制品科学
- 精准畜牧养殖 精准畜牧养殖 精准畜牧养殖
背景情况:
- 乳形状对于牛奶产量,牛的健康和福利至关重要.
- 自动挤奶系统 (AMS) 提供客观的,大量的关于乳头特征的数据.
- 基因组选择有可能提高乳牛的繁殖效率.
研究的目的:
- 从北美霍尔斯坦牛的AMS记录中获得的乳头形状特征的基因组遗传参数估计.
- 评估这些特征之间的遗传关联以及牛奶产量和质量.
- 评估多特征基因组选择对AMS适合性的可行性.
主要方法:
- 使用36个AMS (2017-2021) 收集了4480头荷尔斯坦牛的530万个乳头乳头坐标记录.
- 导出了五个乳头形状特征 (UB,UD,FTD,RTD,DFR),包括每日乳量 (DY) 和牛奶电导率 (EC).
- 估计的基因参数使用可重复性动物模型在4118个基因型的奶牛 (57600SNP).
主要成果:
- 遗传概率估计范围从中等到高 (例如,UD:0.79 ± 0.01,DFR:0.65 ± 0.02).
- 重复性的估计值很高 (例如,UD:0.93 ± 0.01,DFR:0.88 ± 0.01).
- 在乳头特征 (例如,FTD-RTD:0.54 ± 0.03) 和生产特征 (例如,DFR-DY:0.30 ± 0.04) 之间发现了显著的遗传相关性.
结论:
- 来自AMS的乳头形状特征是中度到高度遗传的.
- 遗传相关性表明多特征基因组选择的潜力,以提高AMS适应性.
- 这些发现支持基因组选择方案的设计,以提高精密奶牛养殖中的乳头形状.
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