安格斯牛肉牛年龄体重的宏观和微基因环境敏感性
M D Madsen1, J H J van der Werf1, S Clark1
1School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
Animal : an international journal of animal bioscience
|January 18, 2024
概括
遗传环境敏感性 (GES) 影响澳大利亚安格斯年幼体重 (YW). 这项研究量化了宏观和微观GES,发现两者都是可遗传的,可以通过选择改变.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 牛肉牛的繁殖 牛肉牛的繁殖
背景情况:
- 澳大利亚肉牛面临着不同的环境条件,导致基因型与环境相互作用 (GxE).
- 遗传环境敏感性 (GES) 描述了动物对环境变化的反应,包括宏观GES (跨环境) 和微观GES (环境内).
- 幼年体重 (YW) 是澳大利亚安格斯牛的关键特征,可能受到宏观和微观GES的影响.
研究的目的:
- 为了估计澳大利亚安格斯牛中YW的宏观和微型GES所导致的遗传变异.
- 为了评估微GES对YW的遗传性.
- 在变化的澳大利亚条件下,为改善YW提供选择策略的信息.
主要方法:
- 配备了反应规范模型,同时使用组效应来捕捉宏观GES.
- 采用双层次的通用线性模型 (DHGLM) 来估计分散的遗传变异,量化微GES.
- 纳入模型中的雄鹿群 (S×H) 相互作用,以解释宏观GES.
主要成果:
- 在YW.中检测到宏观和微观GES的显著遗传变异.
- 反应规范斜率 (宏观GES) 的方差为0.02-0.03,S×H方差占表型方差的7%.
- 分散的遗传性 (微GES) 从0.06到0.10不等,表明了选择的潜力.
结论:
- 宏观和微观GES都在澳大利亚安格斯牛群中显著影响YW.
- 建议包括反应规范模型和S×H效应,以对YW进行全面的遗传评估.
- 选择策略可以针对宏观和微观GES来改进YW,但仔细实施模型至关重要,以避免偏见的估计.
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