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Killing of spent laying hens using CO2 in poultry barns

Published online by Cambridge University Press:  01 January 2023

C Berg ,
J Yngvesson ,
S Nimmermark ,
V Sandström  and
B Algers
C Berg
Affiliation:
Dept of Animal Environment and Health, Swedish University of Agricultural Sciences, POB 234, SE-53223 Skara, Sweden
J Yngvesson*
Affiliation:
Dept of Animal Environment and Health, Swedish University of Agricultural Sciences, POB 234, SE-53223 Skara, Sweden
S Nimmermark
Affiliation:
Dept of Biosystems and Technology, Swedish University of Agricultural Sciences, POB 103, 230 53 Alnarp, Sweden
V Sandström
Affiliation:
Dept of Animal Environment and Health, Swedish University of Agricultural Sciences, POB 234, SE-53223 Skara, Sweden
B Algers
Affiliation:
Dept of Animal Environment and Health, Swedish University of Agricultural Sciences, POB 234, SE-53223 Skara, Sweden
*
* Contact for correspondence and requests for reprints: jenny.yngvesson@slu.se
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Abstract

In Sweden, laying hens are killed using the following methods: i) traditional slaughter; ii) on-farm with CO2 in a mobile container combined with a grinder; or iii) with CO2 inside the barn. The number of hens killed using the latter method has increased. During these killings a veterinarian is required to be present and report to the Swedish Board of Agriculture. Data were registered during four commercial killings and extracted from all official veterinary reports at CO2 whole-house killings in 2008-2010. On-farm monitoring showed that temperature decreased greatly and with high variability. The time until birds became unconscious after coming into contact with the gas, based on time until loss of balance, was 3-5 min. Veterinary reports show that 1.5 million laying hens were killed, in 150 separate instances. The most common non-compliance with legislation was failure to notify the regional animal welfare authorities prior to the killings. Six out of 150 killings were defined as animal welfare failures, eg delivery of insufficient CO2 or failure to seal buildings to achieve adequate gas concentration. Eleven were either potentially or completely unacceptable from the perspective of animal welfare. We conclude that, on the whole, the CO2 whole-house gas killing of spent hens was carried out in accordance with the appropriate legislation. Death was achieved reliably. However, there remain several risks to animal welfare and increased knowledge would appear vital in order to limit mistakes related to miscalculations of house volume, improper sealing or premature ventilation turn-off.

Keywords

animal welfarecarbon dioxidekillinglaying henon-farmwhole house
Type
Research Article
Information
Animal Welfare , Volume 23 , Issue 4 , November 2014 , pp. 445 - 457
Copyright
© 2014 Universities Federation for Animal Welfare

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References

Benson, ER, Alphin, RL, Rankin, MK, Caputo, MP, Kinney, CA and Johnson, AL 2012 Evaluation of EEG-based determination of unconsciousness vs loss of posture in broilers. Research in Veterinary Science 93: 960–964. http://dx.doi.org/10.1016/j.rvsc.2011.12.008Google ScholarPubMed
Berg, C 2009 On-farm killing of poultry for disease control and other emergencies. Proceedings of Nordic Poultry Conference pp 4.17-20 November 2009, Reykjavik, IcelandGoogle Scholar
Coenen, ML, Lankhaar, J, Lowe, JC and McKeegan, DEF 2009 Remote monitoring of electroencephalogram, electrocardi-ogram, and behaviour during controlled atmosphere stunning in broilers: implications for welfare. Poultry Science 88: 10–19. http://dx.doi.org/10.3382/ps.2008-00120CrossRefGoogle ScholarPubMed
Gerritzen, MA, Lambooij, B, Reimert, H, Stegeman, A and Spruijt, B 2004 On-farm euthanasia of broiler chickens: effects of different gas mixtures on behavior and brain activity. Poultry Science 83: 1294–1301. http://dx.doi.org/10.1093/ps/83.8.1294CrossRefGoogle ScholarPubMed
Gerritzen, MA, Lambooij, E, Stegeman, JA and Spruijt, BM 2006 Slaughter of poultry during the epidemic of avian influenza in the Netherlands in 2003. The Veterinary Record 159: 39–42. http://dx.doi.org/10.1136/vr.159.2.39CrossRefGoogle 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: 179–185. http://dx.doi.org/10.1016/j.appla-nim.2006.11.014CrossRefGoogle Scholar
Gerritzen, MA, Reimert, HGM and Hindle, VA 2012 Multi-stage gas stunning of broilers in transport containers with carbon dioxide in two phases. Animal Welfare 21(S2): 160–161Google Scholar
Gerritzen, MA and Sparrey, J 2008 A pilot study to assess whether high expansion CO2-enriched foam is acceptable for on-farm emergency killing of poultry. Animal Welfare 17: 285–288Google Scholar
Lambooij, E, Gerritzen, MA, Engel, B, Hillebrand, SJW, Lankhaar, J and Pieterse, C 1999 Behavioural responses during exposure of broiler chickens to different gas mixtures. Applied Animal Behavioural Science 62: 255–265. http://dx.doi.org/10.1016/S0168-1591(98)00214-7CrossRefGoogle Scholar
McKeegan, DEF, McIntyre, JA, Demmers, TGM, Lowe, JC, Wathes, CM, van den Broek, PLC, Coenen, AML and Gentle, MJ 2007 Physiological and behavioural responses of broilers to controlled atmosphere stunning: implications for wel-fare. Animal Welfare 16: 409–426Google Scholar
McKeegan, DEF, Reimert, HGM, Hindle, VA, Boulcott, P, Sparrey, JM, Wathes, CM, Demmers, TGM and Gerritzen, MA 2013 Physiological and behavioral responses of poultry exposed to gas-filled high expansion foam. Poultry Science 92:1145–1154. http://dx.doi.org/10.3382/ps.2012-02587CrossRefGoogle ScholarPubMed
McKeegan, DEF, Sparks, NHC, Sandilands, V, Demmers, TGM, Boulcott, P and Wathes, CM 2012 Physiological responses of laying hens during whole-house killing with carbon dioxide. British Poultry Science 52(6): 645–657. http://dx.doi.org/10.1080/00071668.2011.640307CrossRefGoogle Scholar
Raj, ABM and Gregory, NG 1991 Preferential feeding behaviour of hens in different gaseous atmospheres. Research in Veterinary Science 31(1): 57–65Google Scholar
Raj, ABM, Sandilands, V and Sparks, NHC 2006 Review of gaseous methods of killing poultry on-farm for disease control purposes. The Veterinary Record 159: 229–235. http://dx.doi.org/10.1136/vr.159.8.229Google ScholarPubMed
Sandilands, V, Raj, ABM, Baker, L and Sparks, NHC 2011 Aversion of chickens to various lethal gas mixtures. Animal Welfare 20: 253–262Google Scholar
Shields, SJ and Raj, ABM 2010 A critical review of electrical water-bath stun systems for poultry slaughter and recent developments in alternative technologies. Journal of Applied Animal Welfare Science 13:281–299. http://dx.doi.org/10.1080/10888705.2010.507119Google ScholarPubMed
Sparks, NHC, Sandilands, V, Raj, ABM, Turney, E, Pennycott, T and Voas, A 2010 Use of liquid carbon dioxide for whole-house gassing of poultry and implications for the welfare of the birds. Veterinary Record 167: 403–407. http://dx.doi.org/10.1136/vr.c3813Google ScholarPubMed
Sparrey, J, McKeegan, D, Gerritzen, M and Withoos, F 2012 Delivering nitrogen gas to poultry sheds for emergency killing using high expansion foam. Animal Welfare 21(S2): 171Google Scholar
Swedish Board of Agriculture 2008 National regulations and recommendations on the Welfare of Animals at Slaughter and Killing. SJVFS 2007:77. www.jordbruksverket.seGoogle Scholar
Swedish Board of Agriculture 2010 Jordbruksstatistisk årsbok. www.jordbruksverket.se. [Title translation: Annual agricultural statistics]Google Scholar
Turner, PV, Kloeze, H, Dam, A, Ward, D, Leung, N, Brown, EEL, Whiteman, A, Chiappetta, ME and Hunter, DB 2012 Mass depopulation of laying hens in whole barns with liquid car-bon dioxide: evaluation of welfare impact. Poultry Science 91: 1558–1568. http://dx.doi.org/10.3382/ps.2012-02139Google Scholar
Webster, AB and Fletcher, DL 2004 Assessment of the aversion of hens to different gas atmospheres using an approach-avoidance test. Applied Animal Behavioural Science 88: 275–287. http://dx.doi.org/10.1016/j.applanim.2004.04.002Google Scholar
Weeks, CA, Brown, SN, Richards, GJ, Wilkins, LJ and Knowles, TG 2012 Levels of mortality in hens by end of lay on farm and in transit to slaughter in Great Britain. Veterinary Record 170: 647. http://dx.doi.org/10.1136/vr.100728Google ScholarPubMed