Avoiding the risk of dissemination of brain particles into the blood and carcass during cattle stunning: alternative method of stunning


Published: Dec 19, 2017
Keywords:
Bovine Spongiform Encephalopathy (BSE) Dissemination of brain particles Stunning methods and BSE risks Irreversible electrical stunning.
S. RAMANTANIS (Σ. ΡΑΜΑΝΤΑΝΗΣ)
Abstract

During stunning, the entrance of the bolt into the cranial cavity results in massive brain tissue damage. There is a risk of brain tissue particles being transferred via the blood flow in the minor blood circulation system. This can lead to a contamination of blood, lungs and heart with the bovine spongiform encephalopathy (BSE) agent. Tissues of CNS carry almost all of the infectivity in catde sub-clinically and clinically affected by the BSE. The approved rapid post mortem tests cannot identify BSE infected animals early in the incubation period. Thus, it is not inconceivable that an animal with a negative rapid test result could, if stunned by a method that produced emboli, still have BSE-infected emboli dispersed through the venous blood stream, the lungs and the heart. This danger of contamination has been proved in several scientific studies. The ranking order of stunning methods in terms of decreasing risk for causing contamination is: 1. Pneumatic stunner that injects air. 2. Pneumatic stunner that does not inject air. 3. Captive bolt stunner with pithing. 4. Captive bolt stunner without pithing. Negligible or absent risk can be expected from nonpenetrative stunner and cardiac arrest stunning. For the time being, very few slaughterhouses in the EU implement the electrocution. Since the summer 2001, the first cardiac arrest stunning equipment has been operational in the continental Europe. Two systems for electrical stunning of catde are presented, which are in accordance with the UK and German regulations on the animal protection at slaughter. The replacement of the penetrative stunning method with the cardiac arrest stunning, in regions where the BSE is present, would prevent the risk of dissemination of brain particles into the blood and carcass.

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References
Anil M, Love S, Williams S, Shand A, McKinstry J, Helps C, Waterman-Pearson A, Seghatchian J, Harbour D (1999) Potential contamination of beef carcasses with brain tissue at slaughter. Vet. Ree, 145: 460-462
Anonymous, (2000) UK study approves electrical stunning. http://www.theherald.co.uk/bussines/archive/13-12-19100-19-40-3.html
Anonymous, (2002) Eine Alternative zum Bolzenschuss. Fleischwirtschaft, 5:32-33
BgVV, (2001a) [Federal Institute for Consumer Health Protection and Veterinary Medicine-Bundesinstitut für gesundheitlichen Verbraucherschutz und Veterinärmedizin] Tierschutzgerechte
Bolzenschußbetäubung. Stellungsna hme des BgVV vom Juni 2001. http://www.bgw/de
BgVV, (2001ß) [Federal Institute for Consumer Health Protection and Veterinary Medicine-Bundesinstitut für gesundheitlichen Verbraucherschutz und Veterinärmedizin] Verwendbarkeit von
Hertz, Lunge, und Blut bei Rindern nach Bolzenschussbetäbung. Tierschutzgerechte Bolzenschußbetäubung. Stellungsnahme des Stellungsnahme des BgVV von 15/3/2001. http://www.bgw/de
Code of practice (2001) The welfare of red meat animals at slaughter. Welfare of animals (slaughter or killing) [WASK] {Amendment} Regulations 1999, Last modified 17 September 2001. http://www.defra.gov.uk
Daly D, Prendergast D, Sheridan J, Blair I, McDowell D (2002) Use of a marker organism to model the spread of central nervous system tissue in cattle and the abattoir environment during commercial
stunning and carcass dressing. Appi. Environm. Micr. 68,2: 791-798
Decision 2000/418/EC Commission decision of 29 June 2000, regulating the use of material presenting risks as regards transmissible spongiform encephalopathies and amending Decision 94/474/EC Official Journal of the European Communities L158/76 of 30/06/2000
Directive 93/119/EC Council Directive 93/119/EC of 22 December 1993 on the protection of animals at the time of slaughter or killing. Official Journal of the European Communities L 340/21 of 31/12/1993
Ironside J (1998) Prion diseases in man. J. Pathol., 186: 227-234
Ironside J (2002): Neuropathology of variant Creutzfeldt-Jacob disease. CR.Biologies, 325: 27-31
Garland T, Bauer N, Bailay M (1996) Brain emboli in the lungs of cattle after stunning. Lancet, 348: 610
HSA, (1995) Head restraint in slaughter-a report. Humane Slaughter Association, Wheathamstead.
Horlacher S, Lücker E, Eigenbrodt E, Wenisch S (2002) ZNS-Emboli in der Rinderlunge. Beri. Münch. Tierärtzl. Wschr. 115:1-5.
Lee A (2002) Personal communication
Lücker E, Schlottermüller B, Martin A (2002) Untersuchungen über die Kontamination von Rindfleisch durch Gewebe des zentralen Nerven-systems (ZNS) im Hinblick auf Schlachttechnologie und humanes BSE-Expositionsrisiko. Beri. Münch. Tierärtzl. Wschr. 115:118-121
Papadopoulos Ο (2001) Transmissible spongiform encephalopathies in cattle and small ruminants. 3rd Hellenic Veterinary Medicine Symposium in Farm Animals, 9-11 November, Thessaloniki, Greece
Ramantanis S (2002) Protection of the consumer from the bovine spongiform encephalopathy (BSE). Food Safety Symposium, Technological Educational Institution (T. E. I.) of Athens, 5 June, Athens, Greece
Regulation 999/2001/EC of the European Parliament and the council of 22 May 2001 laying down the rules for the prevention, control and eradication of certain transmissible spongiform encephalopathies. Official Journal of the European Communities, 31-5-2001, L147
Special Report (2001) Court of auditors. Special Report 14/2201. Official Journal of the European Communities C 324/1 of 20/11/2001
SSC (200la) Preliminary scientific opinion and report on stunning methods and BSE risks. (The risk of dissemination of brain particles into the blood and carcass, when applying certain stunning methods). Adopted by the Scientific Steering Committee, 6-7 September 2001.
SSC (2001ß) Scientific report on stunning methods and BSE risks. (The risk ofdissemination of brain particles into the blood and carcass, when applying certain stunning methods). Prepared by the TSE BSE ad hoc group, 13 December 2001.
SSC (2002) Scientific opinion on stunning methods and BSE risks. (The risk of dissemination of brain particles into the blood and carcass, when applying certain stunning methods). Adopted by the Scientific Steering Committee, 10-11 January 2002.
Schmidt G, Hossner K, Yemm R, Gould D (1999): Potential for disruption of central nervous system tissue in beef cattle by different types of captive bolt stunners. J. Food Prot., 62: 390-394
Schmidt F (2002) Personal communication
Schutt-Abraham I (2002a) Zum Einsatz des Rückenmarkzerstörers bei der Nottötung von Rindern. http://www.schuett-abraham. de/isa-rmz.htm
Schutt-Abraham L, (2002ß): BSE-Präventivmaßnahmen bei der Schlactung von Rindern. Beri. Münch. Tierärtzl. Wschr. 115:125-130.
Tierschutz-Schlachtverordnung (Animal Welfare at Slaughter Regulation): Verordnung zum Schutz von Tieren im Zussamenhang mit der Schlactung oder Tötung (Tierschutz-Schlachtverordnung - TierSchlV) vom 3. Märtz 1997 (BGBL IS. 405), geändert durch Verordnung vom 25. November 1999
(BGBL I S. 2392)
Troeger Κ (2001) Alternative Methoden stehen zur Wahl. Fleischwirtschaft, 4: 62-64
Troeger Κ (2002) Blutentzug sofort nach Stromfluss-Ende. Fleischwirtschaft, 7: 22-25
Wotton S, Gregory N, Whittington P, Parkman I (2000) Electrical stunning of cattle. Vet. Ree, 147: 681-684.