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Killing wild geese with carbon dioxide or a mixture of carbon dioxide and argon

Published online by Cambridge University Press:  01 January 2023

MA Gerritzen ,
HGM Reimert ,
A Lourens ,
MBM Bracke  and
MTW Verhoeven
MA Gerritzen*
Affiliation:
Wageningen UR Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AB Lelystad, The Netherlands
HGM Reimert
Affiliation:
Wageningen UR Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AB Lelystad, The Netherlands
A Lourens
Affiliation:
Wageningen UR Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AB Lelystad, The Netherlands
MBM Bracke
Affiliation:
Wageningen UR Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AB Lelystad, The Netherlands
MTW Verhoeven
Affiliation:
Wageningen UR Livestock Research, Wageningen University and Research Centre, PO Box 65, 8200 AB Lelystad, The Netherlands
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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The killing of animals is the subject of societal and political debate. Wild geese are caught and killed on a regular basis for fauna conservation and damage control. Killing geese with carbon dioxide (CO2) is commonly practiced, but not listed in legislation on the protection of flora and fauna, and societal concerns have been raised against this method. In this study, an experiment was carried out killing 30 wild-caught geese using either CO2 or a mixture of CO2 and argon (Ar). Brain function (EEG) and heart function (ECG) were measured to determine loss of consciousness and onset of death. The stage of unconsciousness was reached on average within one minute in both treatments (56 s for CO2 and 50 s for CO2 and Ar). States of minimal brain activity and ineffective heart beat were reached more quickly using CO2 compared to CO2 and Ar (112 versus 178 s for minimal brain activity and 312 versus 394 s for ineffective heart beat for CO2 and the mixture of CO2 and Ar, respectively). The mixture of carbon dioxide and argon did not significantly reduce time to loss of consciousness or death. Further studies on behaviour and stress physiology are needed to determine conclusively whether CO2 alone is a satisfactory agent to kill wild-caught geese as the lower CO2 concentration in the CO2-Ar treatment may act as a sedative and reduce the aversiveness of the animals during exposure to lethal gas concentrations.

Keywords

animal welfareargonCO2geesekillingstunning
Type
Research Article
Information
Animal Welfare , Volume 22 , Issue 1: Including selected abstracts from the WSPA/Defra Whale Welfare and Ethics Workshop, March 2011 , February 2013 , pp. 5 - 12
Copyright
© 2013 Universities Federation for Animal Welfare

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