ZDHB.htm

NR ZDHB

AU Lambooij,E.; Pieterse,C.

TI Alternative methods for stunning poultry

QU Proceedings Symposium 'Alternative stunning methods for poultry', Utrecht, Niederlande, 18.-21. November 1997

PT Proceedings

AB Stunning of farm animals is applied to induce unconsciousness during debleeding and to facilitate exsanguination. Application of the stunning methods implies restraining of the animal. A modified captive bolt pistol in which air pressure is used, is a promising alternative to the conventional electrical stunning procedures of broilers. Air pressure stunning sufficiently damages the brain to result in immediate unsconsciousness and largely suppresses the convulsions occurring after original captive bolt stunning, and results in less haemorrhages in breast and thigh muscles. An alternative to waterbath stunning is head-only stunning and to 50 Hz electrical stunning is stunning with higher current frequencies. Different trials were conducted to determine the effects of various alternative stunning and restraining methods on the quality of broiler chicken meat. Broilers placed in a cone convulsed less after electrical head-only stunning than after captive bolt stunning. The degreee of haemorrhaging of breast muscles was not affected by the current pathways of electrical stunning, when the birds are shackled by their feet. In this part of the broiler the effect of the bird's posture (shackled or in a cone) may be more important than the current pathway for the induction of haemorrhages. An alternative stunning system of the general applied waterbath stunner for broiler chickens is gas stunning. In all gas mixtures gasps, head shakes and wing flapping were observed before loss of posture. It may be that these behavioural parameters are related to the increase of CO2 or decrease of O2 in the body of the bird.

SP englisch

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