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Research article - Peer-reviewed, 2006

Dissociative anaesthesia during field and hospital conditions for castration of colts

Marntell S, Nyman G, Funkquist P


The principal aim of this study was to evaluate dissociative anaesthesia for castration of colts during field conditions. Three dissociative anaesthetic protocols were evaluated during castration of colts in an animal hospital. The protocol considered to be the most suitable was thereafter evaluated during castration of colts under field conditions. Respiratory and haemodynamic parameters and the response to surgery were determined during anaesthesia. All horses breathed air spontaneously during anaesthesia. Under hospital conditions 26 colts were randomised to receive one of three anaesthetic protocols: Romifidine and tiletamine-zolazepam (RZ); acepromazine, romifidine and tiletamine-zolazepam (ARZ); or acepromazine, romifidine, butorphanol and tiletamine-zolazepam (ARBZ). The surgeon was blinded to the anaesthetic protocol used and decided whether supplemental anaesthesia was needed to complete surgery. Under field condition 31 colts were castrated during anaesthesia with the ARBZ protocol. All inductions, anaesthesia and recoveries were calin and Without excitation Under both hospital and field conditions. Surgery was performed within 5-20 minutes after the horses had assumed lateral recumbency during both hospital and field castrations. Under hospital conditions sonic horses needed supplemental anaesthesia with all three anaesthetic protocols to complete surgery. Interestingly, none of the horses castrated with protocol ARBZ under held conditions needed additional anaesthesia. Cardiorespiratory changes were within acceptable limits in these clinically healthy colts

Published in

Acta Veterinaria Scandinavica
2006, volume: 47, number: 1, pages: 1-11

Authors' information

Funkquist, Pia
Swedish University of Agricultural Sciences, Department of Clinical Sciences
Nyman, Görel
Marntell, Stina

UKÄ Subject classification

Animal and Dairy Science
Veterinary Science

Publication Identifiers


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