在牛肉和奶牛种群中,对与气质相关的特征的遗传概率估计进行了系统审查和元分析
Luís Fernando Batista Pinto1,2, Bruno Delphino Medrado3, Victor Breno Pedrosa2,4
1Department of Animal Sciences, Federal University of Bahia, Salvador, Brazil.
概括
牛的气质是适度遗传的,特别是牛肉品种的断奶时的飞行速度. 对于乳牛的气质遗传学,需要更多的研究.
科学领域:
- 动物遗传学动物遗传学
- 动物育种 动物育种
- 行为科学 行为科学
背景情况:
- 气 (服从) 对牛的福利,处理者安全和生产力至关重要.
- 之前的研究表明,牛的气质特征的遗传概率估计是可变的.
- 需要进行全面的审查,以整合现有的遗传数据.
研究的目的:
- 系统地审查和对全球牛气质特征的遗传性估计进行元分析.
- 为各种气质指标提供加权遗传概率估计.
- 为了确定牛肉和奶牛种群之间的遗传性差异.
主要方法:
- 对106项关于牛气质遗传性的研究进行了系统审查.
- 使用随机模型方法对95个遗传概率估计的元分析.
- 分析特征,包括飞行分数,飞行速度,运动分数,粉碎分数,笔分数,攻击性和一般/母乳气.
主要成果:
- 根据特征和年龄,权重的遗传概率估计有所不同,断奶时的飞行速度 (0.30) 和断奶/年幼时的飞行速度的联合分析 (0.27) 在肉牛中显示出更高的值.
- 肉牛的特征表现出低到中等的异质性 (0-77%).
- 乳牛的特征表现出低遗传性和高异质性,表明需要进一步调查.
结论:
- 气在肉牛中是适度遗传的,奶时的飞行速度是关键指标.
- 在研究中对肉牛的气质特征进行标准化似乎是合理的.
- 进一步的研究对于阐明乳牛气质的遗传基础至关重要.
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