de Aluja A S, Tapia Pérez G, López F, Pearson R A
Departamento de Patologia, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de Mexico, 04510, Mexico, DF.
Trop Anim Health Prod. 2005 Nov;37 Suppl 1:159-71. doi: 10.1007/s11250-005-9007-0.
Body measurements (length from nape of neck to the withers; height to withers; length from withers to tail root; length from shoulder to tuber ischii; thoracic circumference; umbilical circumference) were taken and correlated with live weight from 160 donkeys (mean +/- standard deviation = 6 +/- 2.6 years old) in Central Mexico. The age was assessed from dentition. Sex of the donkeys was also recorded. Sex was an important factor of variation (p = 0.011). Live weight was estimated using two allometric models. Model 1: Live weight = beta x (thoracic circumference)beta1. Model 2: Live weight = betao x (height to the withers) beta1 x (thoracic circumference) beta2. Separate prediction equations were produced for males and females, plus one for the total sampled. The 'best fit' models, were those using thoracic circumference to predict the live weight. Males: live weight = 0.018576 x (thoracic circumference)1.84107 (R2 = 0.9839). Females: live weight = 0.031255 x (thoracic circumference)1.72888 (R2 = 0.9839). The equations derived to estimate the live weight of donkeys in Britain, Morocco and Zimbabwe were less satisfactory for use with donkeys from Central Mexico because they overestimated the live weight.
对墨西哥中部的160头驴（平均年龄±标准差 = 6±2.6岁）进行了身体测量（从颈部背侧到鬐甲的长度；到鬐甲的高度；从鬐甲到尾根的长度；从肩部到坐骨结节的长度；胸围；脐围），并将其与体重进行关联。年龄通过牙齿情况评估。还记录了驴的性别。性别是一个重要的变异因素（p = 0.011）。使用两个异速生长模型估算体重。模型1：体重 = β×（胸围）β1。模型2：体重 = β0×（到鬐甲的高度）β1×（胸围）β2。分别为雄性和雌性生成了预测方程，另外还为整个样本生成了一个方程。“最佳拟合”模型是那些使用胸围来预测体重的模型。雄性：体重 = 0.018576×（胸围）1.84107（R2 = 0.9839）。雌性：体重 = 0.031255×（胸围）1.72888（R2 = 0.9839）。为估算英国、摩洛哥和津巴布韦驴体重而推导的方程，用于墨西哥中部的驴时不太令人满意，因为它们高估了体重。
