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Survey of the incidence of post-stun behavioural reflexes in electrically stunned broilers in commercial conditions and the relationship of their incidence with the applied water-bath electrical parameters

Published online by Cambridge University Press:  01 January 2023

MI Anastasov
Affiliation:
University of Bristol, Department of Clinical and Veterinary Science, Langford, Bristol BS40 5DU, UK
SB Wotton*
Affiliation:
University of Bristol, Department of Clinical and Veterinary Science, Langford, Bristol BS40 5DU, UK
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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Despite recent technological advances, stunning efficiency of broilers in commercial plants is still questionable and a major public concern. The aim of this survey was to assess the electric water-bath parameters used in poultry processing plants, establish practical ways for the assessment of stunning efficiency in these conditions, link their incidence to the applied current and propose methodology for the online evaluation of the effectiveness of electrical water-bath stunning. A total of 5,378 broilers were assessed randomly for signs of post-stun recovery at 4, 8, 13 and 25 s post-water-bath exit (WBE) through corneal reflex, rhythmic breathing, head shake and escape behaviour on three processing lines. The electric water-bath parameters used did not meet the recommended current and frequencies for effective stunning. No rhythmic breathing was detected with any of the birds at 4 s post water-bath exit, while this reflex returned by 8 s in some birds. Broilers that had their necks cut had a significantly lower incidence of breathing compared to those that missed the neck cutter. The electric water-bath stunners that were tested did not abolish the corneal reflex where 38.4% of birds tested positive, at 4 s post WBE. Pulsed DC-stunned birds that missed the knife had a significantly higher incidence of positive corneal reflexes than those that had their necks cut. Head shake was present on 26.7% of the birds when assessed at 25-30 s post WBE. The trends in incidence of behavioural reflexes with time post WBE may be used for the assessment of stunning efficiency, particularly on birds that miss the knife, but none of the assessed indicators could unequivocally demonstrate unconsciousness.

Type
Research Article
Copyright
© 2012 Universities Federation for Animal Welfare

References

Bilgili, SF 1992 Electrical stunning of broiler: basic concept and carcass quality implication. Review. Journal of Applied Poultry Research 1: 135146CrossRefGoogle Scholar
Fletcher, DL 1999 Symposium: recent advances in poultry slaughter technology. Poultry Science 78: 277281CrossRefGoogle Scholar
Gregory, NG 1986 The physiology of electrical stunning and slaughter. Humane Slaughter of Animals for Food Symposium pp 314. 18 September 1986, Potters Bar, Herts, UKGoogle Scholar
Gregory, NG 1989 Stunning and slaughter. In: Mead, GC (ed) Processing of Poultry pp 3136. Elsevier Applied Science: London, UKGoogle Scholar
Gregory, NG and Wotton, SB 1990a Effect of stunning on the spontaneous physical activity and the evoked activity in the brain. British Poultry Science 31: 215220. http://dx.doi.org/10.1080/00071669008417248CrossRefGoogle ScholarPubMed
Gregory, NG and Wotton, SB 1990b Comparison of neck dislocation and percussion of the head on visual evoked responses in the chickens brain. Veterinary Record 126: 570572Google ScholarPubMed
Gregory, NG and Wotton, SB 1991 Effect of depth of immersion in the water bath on the effectiveness of electrical stunning in chickens. Research in Veterinary Science 51: 200202. http://dx.doi.org/10.1016/0034-5288(91)90014-FCrossRefGoogle Scholar
Gregory, NG and Wotton, SB 1992 Effect of wetting a chicken's feathers on the effectiveness of electrical stunning. Research in Veterinary Science 53: 250251. http://dx.doi.org/10.1016/0034-5288(92)90118-LCrossRefGoogle ScholarPubMed
Handle, VA, Lambooij, E, Reimert, HGM, Workel, LD and Gerritzen, MA 2009 Electrical water bath stunning of poultry. An evaluation of the present situation in Dutch slaughterhouses and alternative electrical stunning methods. Project No BO-07-011-038. Dutch Ministry of Agriculture: The NetherlandsGoogle Scholar
Handle, VA, Lambooij, E, Reimert, HGM, Workel, LD and Gerritzen, MA 2010 Animal welfare concerns during the use of the water bath for stunning broilers, hens, and ducks. Poultry Science 89: 401412. http://dx.doi.org/10.3382/ps.2009-00297CrossRefGoogle Scholar
Heath, GBS 1984 The slaughter of broiler chickens. World's Poultry Science Journal 40: 151159CrossRefGoogle Scholar
Kuenzel, WJ and Walther, JH 1978 Heart beat, blood pressure, respiration and brain waves of broilers as affected by electrical stunning and bleed-out. Poultry Science 57: 655659Google Scholar
Lambooij, E, Pieterse, C, Potgieter, CM, Snyman, JD and Nortje, GL 1999 Some neural and behavioural aspects of electrical and mechanical stunning in ostriches. Meat Science 52: 339345. http://dx.doi.org/10.1016/S0309-1740(99)00011-XCrossRefGoogle ScholarPubMed
Mouchoniere, M, Le Pottier, G and Fenandez, X 1999 The Effect of current frequency during waterbath stunning on the physical recovery and rate and extent of bleed out in turkeys. Poultry Science 77: 485489Google Scholar
Prinz, S 2009 Electrical water bath stunning: effects of electrical parameters on the electroencephalogram and physical reflexes of broilers. PhD Thesis, Radbound University, Faculty of Social Science, Nijmegen, The NetherlandsGoogle Scholar
Prinz, S, Van Oijen, G, Ehinger, F, Coenen, A and Bessei, W 2010a Electroencephalogram and physical reflexes of broilers after electrical water bath stunning using an alternating current. Poultry Science 89: 12651274. http://dx.doi.org/10.3382/ps.2009-00135CrossRefGoogle Scholar
Prinz, S, Van Oijen, G, Ehinger, F, Bessei, W and Coenen, A 2010b Effects of water bath stunning on the electroencephalogram and physical reflexes of broilers using a pulsed direct current. Poultry Science 89: 12751284. http://dx.doi.org/10.3382/ps.2009-00136CrossRefGoogle Scholar
Raj, ABM 1998 Welfare during stunning and slaughter of poultry. Poultry Science 77: 18151819CrossRefGoogle ScholarPubMed
Raj, ABM, Wilkins, LJ, O’Callaghan, M and Phillips, AJ 2001 Effect of electrical stun/kill method, interval between killing and neck cutting and blood vessels cut on blood loss and meat quality in broilers. British Poultry Science 42: 5156Google ScholarPubMed
Raj, ABM and O’Callaghan, M 2004 Effect of amount of frequency of head-only stunning currents on the electroencephalogram and somatosensory evoked potentials in broilers. Animal Welfare 13: 112Google Scholar
Raj, ABM, O’Callaghan, M and Hughes, SI 2006a The effects of amount and frequency of pulsed direct current used in water bath stunning and of slaughter methods on spontaneous electroencephalograms in broilers. Animal Welfare 15: 1924Google Scholar
Raj, ABM, O’Callaghan, M and Knowles, TG 2006b The effect of amount and frequency of alternating current used in water bath stunning and of slaughter methods on encephalograms of broilers. Animal Welfare 15: 718Google Scholar
Raj, ABM, O’Callaghan, M and Hughes, SI 2006c The effect of pulse width of a direct current used in water bath stunning and of slaughter method on spontaneous encephalogram in broilers. Animal Welfare 15: 2530Google Scholar
Rawles, D, Marcy, J and Hulel, M 1995 Constant current stunning of market weight broilers. Journal of Applied Poultry Research 4: 109116CrossRefGoogle Scholar
Richards, SA and Sykes, AH 1964 Observation on electrical stunning and slaughter of poultry. Veterinary Record 76: 835839Google Scholar
Scagliotti, RH 1999 Comparative neuro-ophthalmology. In: Gelatt, KN (ed) Veterinary Ophthalmology, Third Edition pp 13071400. Lippincott, Williams and Wilkins: Philadelphia, USAGoogle Scholar
Schutt-Abraham, I, Wormuth, HJ and Fessel, J 1987 Comparative experiments on the humane electric stunning of different types of slaughter poultry. Berliner und Munchener tierarztliche wochenschrift 100: 332340Google Scholar
Scott, WN 1978 The slaughter of poultry for human consumption. Animal Regulation Studies 1: 227234Google Scholar
WASK 1995 The Welfare of Animals (Slaughter or Killing) Regulations 1995 http://www.opsi.gov.uk/si/si1995/Uksi_19950731_en_1.htm. (Accessed July 2010)Google Scholar
Wenzlawowicz, M and von Holleben, K 2001 Assessment of stunning effectiveness according to present scientific knowledge on electrical stunning of poultry in water bath. Archiv fur Geflugelkunde 65: 193198Google Scholar
Wilkins, LJ, Gregory, NG, Wotton, SB and Parkman, ID 1998 Effectiveness of electrical stunning applied using a variety of waveform frequency combinations and consequences for carcase quality in broiler chickens. British Poultry Science 39: 511518. http://dx.doi.org/10.1080/00071669888692CrossRefGoogle ScholarPubMed
Wilkins, LJ, Wotton, SB and Parkman, ID 1999 Constant current stunning. Effect on bird welfare and carcass quality. Journal of Applied Poultry Research 8: 465471CrossRefGoogle Scholar
Wormuth, HJ, Schutt, I and Fessel, J 1981 Tierschutzgerechte elektrische Betäubung von Schlachtgeflügel. VetMed Berichte 2/1981. Dietrich Reimer Verlag: Berlin, Germany. [Au: Title translation: Electrical stunning of poultry in accordance with animal welfare]Google Scholar
Wotton, SB and Sparrey, J 2002 Stunning and slaughter of ostriches. Meat Science 60: 389394. http://dx.doi.org/10.1016/S0309-1740(01)00149-8CrossRefGoogle ScholarPubMed
Wotton, SB and Wikins, LJ 1999 Effect of very low pulsed current at high frequency on the return of neck tension of broilers. Veterinary Record 145: 393396. http://dx.doi.org/10.1136/vr.145.14.393CrossRefGoogle ScholarPubMed