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Could low atmospheric pressure stunning (LAPS) be suitable for pig slaughter? A review of available information

Published online by Cambridge University Press:  01 January 2023

JA Bouwsema  and
JA Lines
JA Bouwsema*
Affiliation:
Silsoe Livestock Systems, Wrest Park, Silsoe, Bedford MK45 4HR, UK
JA Lines
Affiliation:
Silsoe Livestock Systems, Wrest Park, Silsoe, Bedford MK45 4HR, UK
*
* Contact for correspondence: [email protected]
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Abstract

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Low atmospheric pressure stunning (LAPS) is a slaughter technique which may be less stressful for pigs (Sus scrofa domestica) than current commercial stunning and slaughter methods. The main methods used currently for slaughtering pigs are electric and carbon dioxide stunning, both of which are widely recognised as stressful for pigs. There is currently no published research on the use of LAPS for stunning adult pigs, however there is a significant body of relevant experience from investigations into the effects of low pressure and hypoxia on humans, hypoxia for killing pigs and the use of LAPS for killing poultry, rats and piglets. In this paper, the basic physics and biology of LAPS is briefly reviewed and relevant experience from research with humans, poultry, rats and piglets is presented. On the basis of this information, some initial parameters for LAPS trials with pigs are proposed, potential welfare issues identified and an approach to achieving LAPS at a commercially viable speed is outlined. While the effects of LAPS on pigs is, at present, uncertain, the evidence from research with humans and other animals suggests that healthy, fasted pigs undergoing LAPS are unlikely to suffer from air hunger or from pain. Any pigs suffering from upper respiratory tract disease, tooth decay or excess gas in the alimentary canal may, however, experience pain. A total killing cycle is likely to require 9 to 14 min. To implement LAPS in a commercial, high throughput processing plant will require the use of multiple decompression cylinders. The evidence available suggests that LAPS could be commercially viable for pig slaughter and that for most pigs it will be less stressful than current commercial slaughter methods.

Keywords

animal welfaredecompressiondomestic pigshumane slaughterhypobariahypoxia
Type
Articles
Information
Animal Welfare , Volume 28 , Issue 4 , November 2019 , pp. 421 - 432
Copyright
© 2019 Universities Federation for Animal Welfare

References

Arieli, R, Vitenstein, A and Peled, E 2008 Acclimation to hypoxia does not improve hypoxic survival of the immature pig in confined atmosphere. Military Medicine 173: 107–111. https://doi.org/10.7205/MILMED.173.1.107CrossRefGoogle Scholar
Banzett, RB, Gracely, RH and Lansing, RW 2007 When it's hard to breathe, maybe pain doesn't matter. Focus on ‘Dyspnea as a noxious sensation: inspiratory threshold loading may trigger dif-fuse noxious inhibitory controls in humans’. Journal of Neurophysiology 97: 959–960. https://doi.org/10.1152/jn.00970.2006CrossRefGoogle ScholarPubMed
Banzett, RB, Lansing, RW, Brown, R, Topulos, GP, Yager, D, Steele, SM, Londoño, B, Loring, SH, Reid, M, Adams, L and Al, E 1990 ‘Air hunger’ from increased pCO2 persists after complete neuromuscular block in humans. Respiration Physiology 81: 1–17. https://doi.org/10.1016/0034-5687(90)90065-7CrossRefGoogle ScholarPubMed
Banzett, RB and Moosavi, SH 2001 Dyspnea and pain: Similarities and contrasts between two very unpleasant sensations. American Pain Society Bulletin 11: 1–8Google Scholar
Beausoleil, NJ and Mellor, DJ 2015 Introducing breathlessness as a significant animal welfare issue. New Zealand Veterinary Journal 63: 44–51. https://doi.org/10.1080/00480169.2014.940410CrossRefGoogle ScholarPubMed
BOC Online 2018 Gas A-Z. https://www.boconline.co.uk/shop/en/uk/gas-a-zGoogle Scholar
Buzzard, B 2012 Evaluation of hypobaric hypoxia as a low stress alternative to carbon dioxide euthanasia for use with nursery piglets. MSc thesis, Kansas State University, USAGoogle Scholar
Cantieni, J 1976 Ein Beitrag zur COz-Betaubung von Schlachtschweinen. Schweiz Arch Tierheilk 119: 355-37. [Title translation: A contribution to CO2 stunning of slaughter pigs]Google Scholar
Cattaruzzi, B and Cheek, H 2008 European patent application: Method for humanely stunning and slaughtering poultry using con-trolled low atmospheric pressure. Application number 08150478.9. https://worldwide.espacenet.com/publicationDetails/originalDocu ment?FT=D&date=20120201&DB=EPODOC&locale=en_EP&CC =EP&NR=2055191B1&KC=B1&ND=5#Google Scholar
Cattaruzzi, B and Cheek, H 2011 European patent specification: Method for decreasing spastic wing activity of poultry during slaughter. Application number 11184971.7. https://worldwide.espacenet. com/publicationDetails/originalDocument?FT=D&date=20120418&DB=EPODOC&locale=en_EP&CC=EP&NR=2441331A1&KC=A1&ND=4#Google Scholar
Centre de Technologica de la Carn 2005 Research Project Final Report: Containability and aversiveness of different gas mixtures used for the stunning of slaughter weight pigs. Project MH0135. DEFRA: London, UKGoogle Scholar
CIFA (Canadian Food Inspection Agency) 2013 Letter of New Technology or Procedure Final Assessment Track No MPD-NTech/Pro 2013-21-Low Atmospheric Pressure Stunning Technology. CIFA: Ottawa, CanadaGoogle Scholar
Dalmau, A, Llonch, P, Rodríguez, P, Ruiz-de-la-Torre, J, Manteca, X and Velarde, A 2010a Stunning pigs with different gas mixtures: gas stability. Animal Welfare 19: 315–323Google Scholar
Dalmau, A, Rodríguez, P, Llonch, P and Velarde, A 2010b Stunning pigs with different gases: aversion in pigs. Animal Welfare 19: 325–333Google Scholar
Dee, SA 2016 Overview of respiratory diseases of pigs. https://www.msdvetmanual.com/respiratory-system/respiratory-diseases-of-pigs/overview-of-respiratory-diseases-of-pigsGoogle Scholar
Defra 2006 Welfare of Animals (Transport)(England) Order 2006. Defra: London, UKGoogle Scholar
Edwards, LN and Engle, TE 2011 Evaluation and application of humane hypoxia euthanasia for nursery pigs. Allen D Leman Swine Conference pp 235–241. 17-20 September 2011, St Paul, MN, USAGoogle Scholar
EFSA 2004 Opinion of the Scientific Panel on Animal Health and Welfare on a request from the Commission related to welfare aspects of the main systems of stunning and killing the main com-mercial species of animals. The EFSA Journal 45: 1–29. https://doi.org/10.2903/j.efsa.2004.45Google Scholar
EFSA 2017 Low atmospheric pressure system for stunning broiler chick-ens. EFSA Journal 15(12): 5056. https://doi.org/10.2903/j.efsa.2017.5056Google Scholar
Eikenbloom, G, Bolick, AH and Sybesman, W 1990 Effects of feed withdrawal before delivery on pork quality and carcass yield. Meat Science 29: 25–30. https://doi.org/10.1016/0309-1740(91)90020-QCrossRefGoogle Scholar
Engle, TE and Edwards, LN 2010 Evaluation and application of humane hypoxia euthanasia for nursery pigs. Pork Checkoff. https://www.pork.org/research/evaluation-and-application-of-humane-hypoxia-euthanasia-for-nursery-pigs/Google Scholar
EU 2018 Pigmeat production statistics. http://agridata.ec.europa.eu/extensions/DashboardPigmeat/PigmeatProductionAnalysis.htmlGoogle Scholar
European Commission 2018 Commission Implementing Regulation (EU)_ 2018/723 of 16 May 2018 amending Annexes I and II to Council Regulation (EC) No 1099/2009 on the protection of ani-mals at the time of killing as regards the approval of low atmospheric stunning. EC: Brussels, BelgiumGoogle Scholar
European Council 2009 European Council Regulation No 1099/2009 on the protection of animals at the time of killing. Official Journal of the European Union L303: 1–30Google Scholar
Farm Animal Welfare Council 2003 Report on the Welfare of Farmed Animals at Slaughter or Killing Part 1: Red Meat Animals. FAWC: London, UKGoogle Scholar
FISA 2015 Study on the humane stunning and killing of non-viable piglets with a nitrogen-filled, highly expansive foam on farm level. http://www.fisaonline.de/index.php?lang=en&act=projects&view=details&p_id=8663Google Scholar
Gradwell, DP 2016 Hypoxia and hyperventilation. In: Gradwell, DP and Rainford, DJ (eds) Ernsting's Aviation and Space Medicine, Fifth Edition p 904. CRC Press: Boca Raton, FL, USACrossRefGoogle Scholar
Gradwell, DP and Macmillan, AJF 2016 Oxygen systems, pres-sure cabin and clothing. In: Gradwell, DP and Rainford, DJ (eds) Ernsting's Aviation and Space Medicine, Fifth Edition. CRC Press: Boca Raton FL, USACrossRefGoogle Scholar
Harding, RM 2002 Pressure changes and hypoxia in aviation. In: Pandolf, KB and Burr, RE (eds) Medical Aspects of Harsh Environments, Volume 2 pp 984–1012. The Office of the Surgeon General, The United States Army: Falls Church, Virginia, USAGoogle Scholar
Harding, RM and Gradwell, DP 1999 Hypoxia and hyperventilation. In: Ernsting, J, Nicholson, AN and Rainford, DJ (eds) Aviation Medicine, Third Edition pp 43–58. Butterworth-Heineman: Oxford, UKGoogle Scholar
Holloway, PH and Pritchard, DG 2017 Effects of ambient tem-perature and water vapor on chamber pressure and oxygen level during low atmospheric pressure stunning of poultry. Poultry Science 96: 2528–2539. https://doi.org/10.3382/ps/pex066CrossRefGoogle Scholar
Humane Slaughter Association 2007 Carbon Dioxide Stunning and Killing of Pigs. HSA: Wheathampstead, UKGoogle Scholar
Jackson, PGG and Cockcroft, PD 2007 Handbook of Pig Medicine. Elsevier: Philadelphia, PA, USAGoogle Scholar
Lansing, RW and Banzett, RB 1996 Psychophysical methods in the study of respiratory sensation. In: Adams, L and Guz, A (eds) Respiratory Sensation, Volume 90 pp 69–100. Marcel Dekker Inc: New York, USAGoogle Scholar
Lansing, RW, Gracely, RH and Banzett, RB 2009 The multi-ple dimensions of dyspnea: Review and hypotheses. Respiratory Physiology and Neurobiology 167: 53–60. https://doi.org/10.1016/j.resp.2008.07.012CrossRefGoogle Scholar
Mackie, N and McKeegan, DEF 2016 Behavioural responses of broiler chickens during low atmospheric pressure stunning. Applied Animal Behaviour Science 174: 90–98. https://doi.org/10.1016/j.applanim.2015.11.001CrossRefGoogle Scholar
Macmillan, AJF 1999a The effects of pressure change on body cavities containing gas. In: Ernsting, J, Nicholson, AN and Rainford, D (eds) Aviation Medicine, Third Edition pp 13–18. Butterworth-Heineman: Oxford, UKGoogle Scholar
Macmillan, AJF 1999b Sub-atmospheric decompression sickness. In: Ernsting, J, Nicholson, AN, and Rainford, DJ (eds) Aviation Medicine, Third Edition pp 19–25. Butterworth-Heineman: Oxford, UKGoogle Scholar
Marahrens, M, Pohlmann, V, Balzer, K, Stehle, E, El Amarti, A, von Frantzius, I, Piotrowski, D, Kiezenbrink, H and Schwarzlose, I 2017 Killing of slaughter pigs and non-viable piglets with nitrogen gas filled high expansive foam. In: Beausoleil, NJ, Golledge, HDR, Garcia, R and Gibson, T (eds) Welfare Impacts of Controlled Atmosphere Methods for Stunning or Killing Animals p 15. 29-30 June 2017, Weybridge, UK. UFAW: Wheathampstead, Herts, UKGoogle Scholar
Martin, JE, Christensen, K, Vizzier-Thaxton, Y, Mitchell, MA and McKeegan, DEF 2016 Behavioural, brain and cardiac responses to hypobaric hypoxia in chickens. Physiology & Behaviour 163: 25–36. https://doi.org/10.1016/j.physbeh.2016.04.038CrossRefGoogle ScholarPubMed
Meyn 2018 Meyn multistage stunning system. https://www.meyn.com/products/live-bird-handling/multistage-co2-stunning-systemGoogle Scholar
Moosavi, SH, Golestanian, E, Binks, AP, Lansing, RW, Brown, R and Banzett, RB 2003 Hypoxic and hypercapnic drives to breathe generate equivalent levels of air hunger in humans. Journal of Applied Physiology 94: 141–154. https://doi.org 10.1152/japplphysiol.00594.2002CrossRefGoogle ScholarPubMed
Nakano, T, Iwazaki, M, Sasao, G, Nagai, A, Ebihara, A, Iwamoto, T and Kuwahira, I 2015 Hypobaric hypoxia is not a direct dyspnogenic factor in healthy individuals at rest. Respiratory Physiology and Neurobiology 218: 28–31. https://doi.org/10.1016/j.resp.2015.07.009CrossRefGoogle Scholar
Nishino, T 2011 Dyspnoea: Underlying mechanisms and treat-ment. British Journal of Anaesthesia 106: 463–474. https://doi.org/10.1093/bja/aer040CrossRefGoogle Scholar
Pracy, JP, White, A, Mustafa, Y, Smith, D and Perry, ME 1998 The comparative anatomy of the pig middle ear cavity: a model for middle ear inflammation in the human? Journal of Anatomy 192: 359–368. https://doi.org/10.1046/j.1469-7580.1998.19230359.xCrossRefGoogle Scholar
Purswell, JL, Thaxton, JP and Branton, SL 2007 Identifying process variables for a low atmospheric pressure stunning-killing system. Journal of Applied Poultry Research 16: 509–513. https://doi.org/10.3382/japr.2007-00026CrossRefGoogle Scholar
Raj, ABM 1999 Behaviour of pigs exposed to mixtures of gases and the time required to stun and kill them: welfare implications. Veterinary Record 144: 165–168. https://doi.org/10.1136/vr.144.7.165CrossRefGoogle ScholarPubMed
Raj, ABM and Gregory, NG 1995 Welfare implications of the gas stunning of pigs 1. Determination of aversion to the initial inhalation of carbon dioxide or argon. Animal Welfare 4: 273–280Google Scholar
Raj, ABM and Gregory, NG 1996 Welfare implication of the gas stun-ning of pigs 2: stress of induction of anaesthesia. Animal Welfare 5: 71–78Google Scholar
Skybrary 2014 Time of useful consciousness. http://www.sky-brary.aero/index.php/Time_of_Useful_ConsciousnessGoogle Scholar
Strachan, D 2004 The disease status of the UK pig industry. http://www.thepigsite.com/articles/1627/the-disease-status-of-the-uk-pigindustry/Google Scholar
Talling, J 2017 Challenges of using controlled atmosphere killing for wild animals. In: Beausoleil, NJ, Golledge, HDR, Garcia, R and Gibson, T (eds) Welfare Impacts of Controlled Atmosphere Methods for Stunning or Killing Animals p 28. 29-30 June 2017, Weybridge, UK. UFAW: Wheathampstead, UKGoogle Scholar
The Engineering Toolbox 2017a Altitude above sea level and air pressure. http://www.engineeringtoolbox.com/air-altitude-pres-sure-d_462.htmlGoogle Scholar
The Engineering Toolbox 2017b Water vapour and saturation pressure in humid air. http://www.engineeringtoolbox.com/water-vapor-saturation-pressure-air-d_689.htmlGoogle Scholar
Torchia, F 2007 Physiological training in hypobaric chamber. XX Congresso AIMAS. 4-7 September 2007, Florence, Italy. http://www.aimas.it/convegni/atti2007/06_09_torchia.pdfGoogle Scholar
US Department of Transportation: Federal Aviation Administration 2008 Aeromedical Factors. Pilot's Handbook of Aeronautical Knowledge pp 1–20. US Department of Transportation: Oklahoma City, OK, USA. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/Google Scholar
Valdez, CD 1990 The FAA altitude chamber training flight profile: A Survey of Altitude Reactions 1965-1989. Civil Aeromedical Institute, Federal Aviation Administration: Oklahoma City, OK, USA. https://www.faa.gov/data_research/research/med_humanfacs/oam techreports/1990s/media/AM90-12.pdfGoogle Scholar
Velarde, A, Gispert, M, Faucitano, L, Alonso, P, Manteca, X and Diestre, A 2001 Effects of the stunning procedure and the halothane genotype on meat quality and incidence of haemor-rhages in pigs. Meat Science 58: 313–319. https://doi.org/10.1016/S0309-1740(01)00035-3CrossRefGoogle ScholarPubMed
Velarde, A, Gispert, M, Faucitano, L, Manteca, X and Diestre, A 2000 Survey of the effectiveness of stunning proce-dures used in Spanish pig abattoirs. The Veterinary Record 146: 65–68. https://doi.org/10.1136/vr.146.3.65CrossRefGoogle Scholar
von Leupoldt, A, Sommer, T, Kegat, S, Baumann, HJ, Klose, H, Dahme, B and Büchel, C 2009 Dyspnea and pain share emotion-related brain network. NeuroImage 48: 200–206. https://doi.org/10.1016/j.neuroimage.2009.06.015CrossRefGoogle ScholarPubMed
Weber, R, Kuehnel, T, Graf, J and Hosemann, W 2014 Aerosinusitis: part 1: Fundamentals, pathophysiology and prophy-laxis. HNO 62: 57–64. https://doi.org/10.1007/s00106-013-2791-3CrossRefGoogle Scholar
Wikipedia 2018 Dilution. https://en.wikipedia.org/wiki/DilutionGoogle Scholar