In the breeding plans of animals, it is essential to have sound estimates of genetic parameters for economically important traits. Over the previous years, genetic parameter estimates have been reported for conformation traits in horses. However, these estimates have been got from studies based on various horse populations. This has resulted in considerable variability among heritability and genetic correlation estimates. Thus, the objective of this study was to conduct a meta-analysis based on a random-effects model to combine different published heritability estimates and genetic correlations between conformation traits (measured and scored) in horses. In total, 166 heritability and 72 genetic correlation estimates from 30 peer-reviewed articles published in 16 different scientific journals between 1995 and 2020 were used in this study. Chi-square (Q) test and the I² statistic were performed to measure heterogeneity of genetic parameter estimates. Also, Egger's linear regression asymmetry was used to examine the presence of publication bias. The weighted coefficients of variation for the conformation traits varied from 0.27% (for leg stance) to 37.80% (for temperament). The heritability estimates for the measured and scored conformation traits ranged from 0.142 (for neck length) to 0.605 (for height at croup), and from 0.082 (for shoulder angle) to 0.445 (for head), respectively. Based on the values of the I² index, substantial and or considerable heterogeneities were observed for the heritability estimates of the measured conformation traits. Also, the results of the Q test indicated that all measured conformation traits showed significant heterogeneities (P<0.10). Except for the genetic correlations between height at withers with leg quality, leg stance, and hooves which were low and non-significant, the genetic correlations between height at withers with other conformation traits were high and significant (P<0.05), and ranged from 0.455 (with chest width) to 0.942 (with height at croup). The genetic correlation estimates between cannon bone circumference with other conformation traits were medium to high and varied from 0.382 (with chest width) to 0.688 (with height at croup). The genetic correlations between cannon bone circumference with chest and or thorax circumference, and body length were non-significant (P>0.05), and their 95% confidence interval included zero. Therefore, these correlation estimates would be considered equal to zero. The average genetic parameter estimates reported in this meta-analysis study are applicable in breeding designs when reliable estimates are not available for conformation traits in horse populations.

在动物育种计划中，必须对具有重要经济意义的性状的遗传参数进行合理估计。在过去的几年里，已经报道了马的构象特征的遗传参数估计。然而，这些估计是从基于各种马种群的研究中得出的。这导致遗传力和遗传相关性估计之间存在相当大的差异。因此，本研究的目的是基于随机效应模型进行荟萃分析，以结合不同已发表的遗传力估计值和马的构象特征（测量和评分）之间的遗传相关性。本研究总共使用了 1995 年至 2020 年间发表在 16 种不同科学期刊上的 30 篇同行评议文章中的 166 项遗传力和 72 项遗传相关性估计值。^{进行了2个}统计以测量遗传参数估计的异质性。此外，使用 Egger 的线性回归不对称性来检查发表偏倚的存在。构象特征的加权变异系数从 0.27%（腿姿）到 37.80%（气质）不等。测量和评分的构造特征的遗传力估计范围分别为 0.142（颈部长度）至 0.605（臀部高度）和 0.082（肩角）至 0.445（头部）。基于 I ²的值对于测量的构象性状的遗传力估计，观察到大量和/或相当大的异质性。此外，Q 检验的结果表明，所有测量的构象性状都显示出显着的异质性（P <0.10）。除了马肩隆高与腿质量、腿站姿和蹄子的遗传相关性较低且不显着外，马肩隆高与其他构象性状的遗传相关性较高且显着（P<0.05），范围为0.455（胸宽）到 0.942（臀高）。大炮骨围与其他构造特征之间的遗传相关性估计为中到高，从 0.382（胸宽）到 0.688（臀部高度）不等。炮骨围与胸围或胸围、体长的遗传相关性不显着（P>0.05），其95%置信区间为零。因此，这些相关性估计将被视为等于零。当马群的构象性状无法获得可靠的估计值时，这项荟萃分析研究中报告的平均遗传参数估计值适用于育种设计。