Salamanca-Carreño Arcesio, Parés-Casanova Pere M, Vélez-Terranova Mauricio, Martínez-Correal Germán, Rangel-Pachón David Eduardo
Facultad de Medicina Veterinaria y Zootecnia, Universidad Cooperativa de Colombia, Villavicencio 500001, Colombia.
Department de Bromatologia, Universitat Oberta de Catalunya, 08018 Catalonia, Spain.
Vet Sci. 2024 Jul 5;11(7):304. doi: 10.3390/vetsci11070304.
Variations in the size of animals of the same species but of different sex are called sexual size dimorphism. The aim of this study was to compare the biometrics between males and females of the Sanmartinero creole bovine, of Colombia, to establish if sexual dimorphism appears in the breed. A total of 94 animals (16 uncastrated males and 78 females, average age of 4.3 ± 1.4 and 4.2 ± 2.3 years, respectively) from three different farms were measured. A total of 21 linear variables were obtained using standard morphometric methods and live weight. A one-way NPMANOVA was used to evaluate between sexes, ages, and farms, a Principal Component Analysis was used to detect the most discriminating variables, and a multivariate regression used age as an independent value. Statistically significant differences were reflected between sexes ( = 0.033) and not by age and farms. The variables that differentiated the most between males and females were those related to size (thoracic circumference, body length, dorso-sternal diameter, height at the withers, height at the rump, and horn length), variables that were biased toward males, although only the height at the withers and the rump were the ones that presented statistically significant differences.
同一物种但不同性别的动物在体型大小上的差异被称为两性体型二态性。本研究的目的是比较哥伦比亚圣马丁克里奥尔牛雄性和雌性之间的生物特征，以确定该品种是否存在两性二态性。对来自三个不同农场的总共94头动物（16头未阉割雄性和78头雌性，平均年龄分别为4.3±1.4岁和4.2±2.3岁）进行了测量。使用标准形态测量方法和活体重量获得了总共21个线性变量。使用单向非参数多元方差分析来评估性别、年龄和农场之间的差异，使用主成分分析来检测最具区分性的变量，并使用多元回归将年龄作为独立变量。性别之间存在统计学上的显著差异（P = 0.033），而年龄和农场之间没有。雄性和雌性之间差异最大的变量是与体型相关的变量（胸围、体长、胸骨背径、肩高、臀高和角长），这些变量偏向雄性，尽管只有肩高和臀高呈现出统计学上的显著差异。
