Calf Response to Caustic Paste and Hot-Iron Dehorning Using Sedation With and Without Local Anesthetic

• Published in: Journal of dairy science 2005-04, Vol.88 (4), p.1454-1459
• Main Authors: Vickers, K. J, Niel, L, Kiehlbauch, L. M, Weary, D. M
• Format: Article
• Language: English
• Subjects: Adrenergic alpha-Agonists - therapeutic use; Anesthetics, Local - pharmacology; Animal productions; animal use refinement; animal welfare; Animals; behavior; Behavior, Animal - drug effects; Biological and medical sciences; Burns, Chemical - physiopathology; Burns, Chemical - veterinary; calves; Cattle - physiology; Cattle - surgery; Caustics - pharmacology; dehorning; Female; Food industries; Fundamental and applied biological sciences. Psychology; Horns - surgery; lidocaine; Lidocaine - pharmacology; Milk and cheese industries. Ice creams; Nerve Block - veterinary; pain; Pain, Postoperative - prevention & control; Pain, Postoperative - veterinary; postoperative care; Random Allocation; Terrestrial animal productions; Vertebrates; xylazine; Xylazine - therapeutic use
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.S0022-0302(05)72813-7

Dairy producers require effective methods of reducing the pain associated with dehorning. Previous work has shown that analgesics can reduce pain associated with hot-iron dehorning, but these interventions may not be practical for some producers. Some producers favor the use of caustic paste (to cause a chemical burn as opposed to thermal burn), but little is known about how to treat pain caused by caustic burns. In 2 experiments, head shaking and head rubbing behaviors were used to evaluate pain following dehorning using caustic paste. In experiment 1, sedated calves were dehorned using a caustic paste, with or without a lidocaine local block. Calves treated with lidocaine showed no evidence of reduced pain response in the hours after the caustic paste was applied. In experiment 2, response to caustic paste dehorning with a sedative only was compared with hot-iron dehorning using a sedative and local anesthetic. In the first 4h after dehorning, calves dehorned with a hot iron showed more head shaking than calves dehorned with caustic paste. These results indicate that dehorning with caustic paste combined with a sedative results in less pain to calves than dehorning with a hot iron combined with a sedative and a local anesthetic.