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在Landrace猪中,生长,身体组成和生殖特征的跨代表观遗传性
Andre C Araujo1, Jay S Johnson2, Jason R Graham1
1Department of Animal Sciences, Purdue University, West Lafayette, IN, United States.
Frontiers in genetics
|February 7, 2025
概括
表观遗传标记影响猪的复杂特征,生长和身体组成的遗传能力中等,但生殖特征的遗传能力低. 包括表观遗传因素并没有显著改变育种价值预测.
科学领域:
- 动物遗传学动物遗传学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 量化遗传学 量化遗传学
背景情况:
- 表观遗传学有助于复杂的特征变异,独立于DNA序列变化.
- 环境暴露可以改变表观遗传标记,影响遗传性.
- 了解表观遗传性对畜牧养殖计划至关重要.
研究的目的:
- 估计Landrace猪的生长,身体组成和生殖特征的跨代表观遗传性.
- 确定几代人间表观遗传标记重置的百分比.
- 评估遗传参数,并使用遗传和表观遗传模型预测繁殖值.
主要方法:
- 使用Landrace猪的例行记录数据集.
- 研究的特征包括出生体重 (BW),断奶体重 (WW),背部脂肪厚度 (BF),出生猪的总数 (TNB) 和活生生的猪数 (NBA).
- 仅包含遗传效应的模型与包括遗传和表观遗传效应在内的模型,以及基因组信息进行了比较.
主要成果:
- 与纯遗传模型相比,表观遗传模型显示出相似或改进的适应性.
- 跨代表观遗传性在0.042 (NBA) 到0.336 (BF) 之间.
- 据估计,表观遗传标记重置在80%至90%之间;直接添加物和母体遗传影响的遗传性估计有所不同,生殖特征的重复性很低. 遗传和表观遗传模型之间的育种价值的预测准确性相似.
结论:
- 跨代表观遗传性在生长/身体组成方面适度,在北美陆地猪的生殖特征方面低.
- 表观遗传效应不会显著改变该种群的育种价值预测.
- 对表观遗传机制的进一步研究可以完善畜牧养殖策略.
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