基于基因组的遗传参数,用于美国霍尔斯坦牛的每日牛奶产量和各种哺乳持续性特征
Patrick R Fotso-Kenmogne1, Paulo L S Carneiro2, Delvan A Silva3
1Postgraduate Program in Animal Sciences, State University of Southwestern Bahia, Itapetinga, BA, 45700-000, Brazil; Ministry of Employment and Vocational Training (MINEFOP), Yaoundé, CE, P.O. Box 16273, Cameroon.
Journal of dairy science
|May 14, 2025
概括
基因组分析显示,美国霍尔斯坦牛的每日牛奶产量和哺乳持续性具有低至中等的遗传性. 建议进行第三次哺乳持续度测量,以选择,显示与整体牛奶产量的弱相关性.
科学领域:
- 动物遗传学和动物基因组学
- 乳制品科学 乳制品科学
- 量化遗传学 量化遗传学
背景情况:
- 优化哺乳持续性对于奶牛的利能力至关重要.
- 了解日常牛奶产量和哺乳持续性的遗传参数对于有效的育种计划至关重要.
- 以前的研究往往侧重于哺乳曲线模型,而不是日常遗传参数.
研究的目的:
- 估计基因组基因参数每日牛奶产量和哺乳持续度在美国霍尔斯坦牛的前三个哺乳期.
- 通过随机回归来确定用于估计这些遗传参数的最佳模型.
- 作为选择标准,评价不同的哺乳持续度指标.
主要方法:
- 利用来自11788头基因型荷尔斯坦牛的大量每日奶产记录 (5,235,411) 的数据集.
- 采用单特征随机回归模型与贝叶斯推理来估计差异和协差元件.
- 比较参数函数和非参数函数 (莱根德直角多项式,B-splines) 用于建模固定和随机效应,根据合适性,节性和计算效率选择最佳模型.
主要成果:
- 牛奶产量的每日遗传性估计范围从0.03到0.22跨平价和牛奶中的天.
- 哺乳持续性的遗传概率估计在0.05到0.20之间.
- 第三次哺乳持久性测量表明适度的遗传性和低至中度的遗传相关性与305天的牛奶产量,使其成为合适的选择标准.
结论:
- 美国霍尔斯坦犬每日牛奶产量和哺乳持续性的基因组参数是低至中等的.
- 哺乳持续性和整体乳产之间存在微弱的关联,这在遗传上是可取的.
- 建议选择第三种哺乳持续度测量方法,以优化哺乳持续度,并通过延长哺乳期来提高乳制品行业的利能力.
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