Document Detail

Validation of the acute electroencephalographic responses of calves to noxious stimulus with scoop dehorning.
MedLine Citation:
PMID:  17676078     Owner:  NLM     Status:  MEDLINE    
AIM: To validate use of the electroencephalogram (EEG) and a minimal anaesthesia model for assessment of noxious sensory input caused by scoop dehorning of calves. METHODS: Twenty Friesian heifers weighing 125-178 kg were maintained under light general anaesthesia using halothane and an established protocol (minimal anaesthesia model). They were then dehorned using a scoop dehorner either with (DH+LA) or without (DH) a lignocaine ring block, and changes in the EEG and electrocardiogram (ECG) recorded. Median frequency (F50), 95% spectral edge frequency (F95) and total power (Ptot) were derived from the EEG data. RESULTS: There were significant increases in the F50 (p<0.01) and F95 (p<0.01), and a decrease in Ptot (p<0.01) following dehorning in the DH group, but there were no changes in the DH+LA group. Transient bradycardia in the first 75 sec following dehorning was recorded in the DH group compared with both pre-treatment values in the same group and with the DH+LA group (p<0.001). Tachycardia was evident by 15 min after dehorning in the DH but not the DH+LA group. CONCLUSIONS: The results validate use of the EEG and a minimal anaesthesia model for assessment of noxious sensory inputs in cattle.
T J Gibson; C B Johnson; K J Stafford; S L Mitchinson; D J Mellor
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Validation Studies    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  55     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-06     Completed Date:  2007-09-27     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  New Zealand    
Other Details:
Languages:  eng     Pagination:  152-7     Citation Subset:  IM    
Animal Welfare Science and Bioethics Centre, Massey University, Private Bag 11222, Palmerston North, New Zealand.
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MeSH Terms
Anesthesia, General / veterinary*
Anesthetics, Local / administration & dosage
Cattle* / physiology,  surgery
Cautery / methods,  veterinary
Electrocardiography / methods,  veterinary
Electroencephalography / methods,  standards,  veterinary*
Horns / surgery*
Lidocaine / administration & dosage
Pain Measurement / methods,  standards,  veterinary*
Tachycardia / epidemiology,  veterinary
Reg. No./Substance:
0/Anesthetics, Local; 137-58-6/Lidocaine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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