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Abstract：
Hair whorls are a hereditary feature in horses that may be associated with temperament and coat color. Hair whorls are described as changes in the hair pattern and may take various forms, such as circular and linear whorls. We first carried out a frequency analysis of hair whorls (circular and linear). Next, a Generalized Non-Linear Model was computed to assess the significance of some potential influencing factors, and a genetic parameter estimation was performed. ENDOG software v4.8 was used to estimate the inbreeding coefficient of all the animals analyzed. It was more common to find horses with circular hair whorls than with linear whorls. The heritability ranges obtained were, in general, medium-high for both circular whorls (0.20 to 0.90) and linear whorls (0.44 to 0.84). High positive correlations were found on the between left and right positions, indicating a tendency to symmetry in certain locations. The laterality of hair whorls was also evidenced, with the biggest concentration on the left-hand side, particularly in gray horses, showing circular whorls below the central line of eyes, which has been associated in a previous paper with a calmer and more docile temperament.
摘要：
毛轮是马的遗传特征，可能与气质和皮毛颜色有关。毛轮被描述为头发图案的变化，可能采取各种形式，如圆形和线性螺纹。我们首先对发轮（圆形和线性）进行了频率分析。接下来,计算了一个广义非线性模型来评估一些潜在影响因素的重要性，并进行了遗传参数估计。使用ENDOG软件v4.8估计所分析的所有动物的近交系数。与线性螺纹相比，发现圆形毛发螺纹的马更常见。获得的遗传力范围为，总的来说,圆形螺纹（0.20至0.90）和线性螺纹（0.44至0.84）均为中高。在左右位置之间发现了高度的正相关，表明在某些位置有对称的趋势。毛轮的偏侧性也得到了证明，最集中在左侧，尤其是灰色的马，在眼睛中心线下方显示圆形螺纹，在之前的一篇论文中，这与更冷静、更温顺的气质有关。
