Satoh Masahiro
Graduate School of Agricultural Science, Tohoku University, Sendai, Japan.
Anim Sci J. 2025 Jan-Dec;96(1):e70031. doi: 10.1111/asj.70031.
The relationships between the distribution and heritability of a ratio trait and the genetic parameters of its component traits were clarified using a Monte Carlo computer simulation. The component traits of a ratio trait were assumed to be normally distributed. The genetic parameters of the ratio trait were estimated using parent-offspring regression. As the genetic and environmental correlations ( and ) of the component traits increased, the variance, skewness, and kurtosis of the ratio trait decreased. The amount of decrease had a greater effect on than on . The estimated heritability of the ratio trait decreased as increased and as decreased. The estimated heritability of a ratio trait can be higher than the heritability of any of its component traits.
通过蒙特卡罗计算机模拟，阐明了比率性状的分布与遗传力及其组成性状的遗传参数之间的关系。假设比率性状的组成性状呈正态分布。使用亲子回归估计比率性状的遗传参数。随着组成性状的遗传和环境相关性（ 和 ）增加，比率性状的方差、偏度和峰度降低。下降幅度对 的影响大于对 的影响。随着 增加和 降低，比率性状的估计遗传力降低。比率性状的估计遗传力可能高于其任何组成性状的遗传力。
