Telles F G, Luna S P L, Teixeira G, Berto D A
Faculty of Veterinary Medicine and Animal Science, Unesp - Univ Estadual Paulista, Botucatu, São Paulo, Brazil.
Vet Anim Sci. 2016 Dec 1;1-2:36-39. doi: 10.1016/j.vas.2016.11.003. eCollection 2016 Dec.
Castration is a controversial practice in swine production because in some countries is still performed without anaesthesia, and therefore causes intense suffering and stress to animals. This study investigated the effect of pre-surgical administration of local anaesthesia (LA) on the growth performance of piglets until the end of the growth phase (102 days). Piglets aged 3 to 5 days were selected in pairs of similar weights and same age. They were originated from 22 litters. The groups were randomly assigned to one of two treatments. Castration was performed with (LA; = 45) or without (NLA; = 45) intra-testicular administration of 0.5 mL of 2% lidocaine plus adrenaline per testicle, administered by an automatic repeating vaccinator. Castration was performed 10 min later. Average daily weight gain and economic impact were evaluated between the intervals before castration until 21 (weaning phase), before castration until 60 (end of the initial nursery phase) and before castration until 102 (growth phase) days of age. Average daily weight gain data were analyzed by comparing the average daily weight gain between the weaning phase, 60 and 102 days of age versus the initial weight (pre-castration). At the end of the growing phase, animals treated with LA showed greater weight gain than animals castrated without anaesthesia. LA also showed improved cost:benefit ratio and theore might provide greater economic benefit under the conditions used in this study. Our findings have proved that castration with LA improves long-term weight gain of piglets.
去势在养猪生产中是一种有争议的做法，因为在一些国家仍在未麻醉的情况下进行，因此会给动物带来强烈的痛苦和应激。本研究调查了术前局部麻醉（LA）对仔猪生长性能的影响，直至生长阶段结束（102天）。选择体重相近、年龄相同的3至5日龄仔猪配对。它们来自22窝。将这些组随机分配到两种处理之一。通过自动重复接种器对每侧睾丸进行睾丸内注射0.5 mL 2%利多卡因加肾上腺素，分别在有（LA组；n = 45）或无（NLA组；n = 45）该操作的情况下进行去势。10分钟后进行去势。评估了去势前至21天（断奶期）、去势前至60天（初始保育期结束）以及去势前至102天（生长阶段）的平均日增重和经济影响。通过比较断奶期、60日龄和102日龄时的平均日增重与初始体重（去势前）来分析平均日增重数据。在生长阶段结束时，接受LA处理的动物比未麻醉去势的动物体重增加更多。LA还显示出成本效益比提高，理论上在本研究使用的条件下可能提供更大的经济效益。我们的研究结果证明，使用LA去势可提高仔猪的长期体重增加。
