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对纯血统马的比赛时间和排名的遗传参数的估计
Denyus Augusto de Oliveira Padilha1, Suelen Fernandes Padilha1, Rafaela Martins1
1Postgraduate Program in Animal Science, Department of Animal Science, UFPR, Curitiba, Parana 80035-050, Brazil.
Journal of equine veterinary science
|November 20, 2024
概括
对纯血统马的遗传分析显示,比赛时间比最终排名更有效的选择特征,特别是在较短的比赛中. 有限的遗传进步表明,目前的选择方法需要重新评估以提高性能.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 马类科学 马类科学
背景情况:
- 纯血统赛马的表现受到复杂的遗传和环境因素的影响.
- 了解遗传参数对于赛马动物的有效育种计划至关重要.
- 以前的研究已经探索了各种性能特征,但需要进行全面的遗传趋势分析.
研究的目的:
- 估计纯种马的比赛时间和最终排名的遗传参数.
- 分析随着时间的推移,种族表现的遗传趋势.
- 作为选择标准,评估比赛时间与最终排名的有效性.
主要方法:
- 利用了来自6,213匹纯血统马的23,290条记录的数据集.
- 采用混合效应模型,包括固定的共变量 (年龄,性别,类,轨道,体重,年龄) 和随机效应 (附加遗传,永久环境,残留).
- 估计的遗传性,可重复性和估计的种族时间和排名的繁殖值之间的相关性.
主要成果:
- 对于比赛时间的遗传性估计范围从0.01到0.17,对于最终排名则从0.04到0.09.
- 对于比赛时间 (0.19-0.37) 的重复性估计比最终排名 (0.15-0.23) 高.
- 随着时间的推移,在1000米比赛中观察到比赛时间的显著减少,但在1600米或2000米比赛中没有. 赛车时间和排名的繁殖值之间的相关性很高 (高达0.84).
结论:
- 比赛时间是一个比最终排名更响应选择的特征,特别是在较短的距离.
- 预计基于比赛时间的选择会间接改善最终排名.
- 多年来观察到的有限的遗传进步表明需要重新评估当前的育种策略.
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