Document Detail

Electroencephalographic responses to concussive non-penetrative captive-bolt stunning in halothane - anaesthetised calves.
MedLine Citation:
PMID:  19471327     Owner:  NLM     Status:  MEDLINE    
AIM: To investigate the electroencephalographic (EEG) and cardiovascular responses of halothane-anaesthetised calves to non-penetrative captive-bolt stunning. METHODS: Ten calves were minimally anaesthetised with halothane, using an established anaesthesia protocol. The EEG, blood pressure and electrocardiogram (ECG) were recorded before and after non-penetrative captive-bolt stunning. Visual inspection and alterations in the total power of the EEG (Ptot) were used to investigate the effects of stunning. RESULTS: Captive-bolt stunning significantly altered cerebrocortical function in all animals. In four animals, Ptot decreased immediately following stunning and remained low throughout the recording period. In another five animals, Ptot responded to stunning in a biphasic manner characterised by an immediate decrease followed by a transient increase and then a final decrease to values similar to those of the non-biphasic animals. CONCLUSIONS: Non-penetrative captive-bolt stunning significantly altered cerebrocortical function in halothane-anaesthetised calves. The changes in cerebrocortical function would be sufficient to produce insensibility within 0 to 14 seconds in conscious animals.
T J Gibson; C B Johnson; J C Murrell; S L Mitchinson; K J Stafford; D J Mellor
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  57     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-05-27     Completed Date:  2009-07-16     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:  90-5     Citation Subset:  IM    
Animal Welfare Science and Bioethics Centre, Massey University, Palmerston North 4442, New Zealand.
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MeSH Terms
Abattoirs / standards*
Anesthetics, Inhalation / administration & dosage
Blood Pressure / physiology
Brain Concussion / etiology,  physiopathology,  veterinary*
Cattle / physiology*
Cerebrovascular Circulation / physiology*
Electrocardiography / veterinary
Electroencephalography / drug effects,  veterinary*
Halothane / administration & dosage
Reg. No./Substance:
0/Anesthetics, Inhalation; 151-67-7/Halothane

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

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