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A pilot study to assess whether high expansion CO2-enriched foam is acceptable for on-farm emergency killing of poultry

Published online by Cambridge University Press:  11 January 2023

MA Gerritzen*
Affiliation:
Animal Sciences Group WUR, Department of Animal husbandry, Division Animal Welfare & Health, PO Box 65, 8200 AB Lelystad, The Netherlands
J Sparrey
Affiliation:
Livetec, 1 Sand Road, Flitton, Bedford MK45 5DT, UK
*
* Contact for correspondence and requests for reprints: marien.gerritzen@wur.nl
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Abstract

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This pilot experiment was conducted to ascertain whether CO2-enriched high expansion foam could be an acceptable and efficient alternative in emergency killing of poultry. This method could have wide-ranging applications but with particular emphasis on small (backyard) flocks, free-range sheds or open (naturally-ventilated) housings. The objectives of the study were as follows: 1) to determine whether the injection of foam and being covered with foam leads to fear or panic reactions in birds; 2) to determine the time taken to render birds unconscious and dead and 3) to determine whether any pathological abnormalities are observed post mortem. Six laying hens were individually exposed to increasing levels of CO2 foam with an expansion rate of 300:1. The test box containing individual birds filled with foam within 30 s. During foaming, two out of six birds tried to escape from the test box (1–2 attempts per bird). Apart from displaying greater alertness, birds showed no aversive reactions to the CO2 foam. Twenty-to-thirty seconds after being covered with foam, five of the six birds demonstrated one or two forcable or convulsive movements. Movement patterns and muscle jerks immediately following this convulsive movement led us to believe that birds lost consciousness at this moment and, within approximately three minutes, all birds had ceased to have a heartbeat. Macroscopic post mortem examination of the birds revealed no abnormalities and microscopic examination showed moderate bronchiolar bleeding and a small amount of alveolar bleeding. After assessing behavioural parameters, measurements of heart rate and pathological data, it is our conclusion that CO2 foam has the potential to be an acceptable method of killing poultry. It is advisable for this method to be examined on a larger scale in order to assess the implications of physiological (EEG and ECG) measurements on welfare.

Type
Articles
Copyright
© 2008 Universities Federation for Animal Welfare

References

Benson, E, Malone, GW, Alphin, RL, Dawson, MD, Pope, CR and van Wicken, GL 2007 Foam-based mass emergency depopulation of floor-reared meat-type poultry operations. Poultry Science 86: 219224CrossRefGoogle ScholarPubMed
Dawson, MD, Benson, ER, Malone, GW, Alphin, RL, Estevez, I and van Wicken, GL 2006 Evaluation of foam-based mass depopulation methodology for floor-reared meat-type poultry operations. Applied Engineering in Agriculture 22(5): 787794CrossRefGoogle Scholar
Gerritzen, MA, Lambooij, E, Reimert, HA, Stegeman, A and Spruijt, B 2004 On farm euthanasia of broiler chicken: effects of different gas mixtures on behavior and brain activity. Poultry Science 83: 12941301CrossRefGoogle ScholarPubMed
Gerritzen, MA, Lambooij, E, Reimert, HGM, Spruijt, BM and Stegeman, A 2006a Susceptibility of ducks and turkeys to severe hypercapnic hypoxia. Poultry Science 85: 10551061CrossRefGoogle ScholarPubMed
Gerritzen, MA, Lambooij, E, Stegeman, A and Spruijt, BM 2006b Killing of poultry during the 2003 avian influenza epidemic in The Netherlands. The Veterinary Record 159: 3942CrossRefGoogle ScholarPubMed
Gerritzen, MA, Lambooij, B, Reimert, H, Stegeman, A and Spruijt, B 2007 A note on behaviour of poultry exposed to increasing carbon dioxide concentrations. Applied Animal Behaviour Science 108: 179185CrossRefGoogle Scholar
Kiezebrink, H 2007 Method for the Sanitary Slaughter of an Animal. International Patent Application. WO 2007/021178 A1. World Intellectual Property Organisation: Geneva, SwitzerlandGoogle Scholar
Ryan, J, Sheehan, M, Wrigley, K and Gaynor, S 2006 Report on the Real-Time Exercise of the ‘Whole house’ Carbon Dioxide Gassing Technique for the Humane Killing of Poultry in a Disease Emergency. State Veterinary Service, Department of Agriculture and Food: IrelandGoogle Scholar