Salamanca-Carreño Arcesio, Parés-Casanova Pere M, Rangel-Pachón David Eduardo, Bentez-Molano Jannet, Vélez-Terranova Oscar Mauricio
Facultad de Medicina Veterinaria y Zootecnia, Universidad Cooperativa de Colombia, Villavicencio 500001, Colombia.
Acuerdo de Cooperación de Investigación, 25798 Catalonia, Spain.
Animals (Basel). 2022 Jul 5;12(13):1731. doi: 10.3390/ani12131731.
The aim of this research was to determine if the division between the cervical, dorsal, and croup profiles (three regions commonly assessed for descriptive profile purposes) has a modular basis as well as a morphological integration. For this, a total of 135 digital photographs were obtained, in a lateral view, of adult horses (14 females and 121 geldings; age range: 2-20 years), of the Araucanian breed, an equine population typical of the flooded savannah of Arauca, NE Colombia. From each image, 25 reference points (semi-landmarks) were obtained at the dorsal level of the neck, back, and croup. The hypothesis of the modularity of different body profiles based on differentiated regions was tested using the coefficient, and an analysis of two blocks of partial least-squares allowed the evaluation of the level of morphological integration. The results showed that each alloidic group reflected high integration but low modularity. The covariation between the modules was centered mainly on the withers, the loin, and the croup. For the studied profile blocks, no module can be considered. The absence of the fragmentation of the alloidic sets would promote the adaptive capacity of the breed by linking coordinated functional responses to similar selection pressures, e.g., field work. Although the integration between the neck, back, and croup profiles was proven, their modular covariation was low.
本研究的目的是确定颈部、背部和臀部轮廓（通常为描述性轮廓评估而划分的三个区域）之间的划分是否具有模块化基础以及形态整合。为此，从哥伦比亚东北部阿劳卡洪水泛滥的大草原典型马种阿劳卡尼亚马的成年马（14匹母马和121匹阉马；年龄范围：2至20岁）的侧视图中总共获取了135张数码照片。从每张图像中，在颈部、背部和臀部的背部水平获取了25个参考点（半地标）。使用系数检验基于不同区域的不同身体轮廓模块化的假设，并且通过对两个偏最小二乘块的分析来评估形态整合水平。结果表明，每个异速生长组都反映出高整合度但低模块化。模块之间的协变主要集中在肩胛、腰部和臀部。对于所研究的轮廓块，无法确定模块。异速生长集缺乏碎片化将通过将协调的功能反应与类似的选择压力（例如野外工作）联系起来，促进该品种的适应能力。尽管颈部、背部和臀部轮廓之间的整合得到了证实，但其模块化协变程度较低。
