ZBJF.htm

NR ZBJF

AU Schütt-Abraham,I.; Knauer-Kraetzl,B.; Wormuth,H.-J.

TI Effects of some stunning conditions on the currents obtained during the electrical stunning of geese

QU Fleischwirtschaft 1992 72(3): 298-300

PT journal article

AB 13 freshly killed geese were repeatedly "re-stunned" at 250 V in a water bath stunner to evaluate the influence of immersion depth as well as the position and condition of the non-live contact on current strength. Contact with the non-live electrode - a metal rail attached to the side of the tub - was varied from "normal" (rail-shackle/bird) contact to distal and proximal metatarsus, drumstick, and end and middle of back. The electrical resistance of the geese remained practically unchanged during the experiments, i.e. within 1/2 hour post mortem. With only the beak immersed the average stunning current was slightly lower than with eye immersion, and notably lower than with wing base immersion. However, this may not solely have been due to a reduced contact with the water, as at the same time the distance between the bird and the actual voltage delivering electrode at the bottom of the tub was increased correspondingly. The resistance at the leg-shackle contact could not be improved by wetting the feet suggesting an already optimized contact between the geese's feet and the tightly fitting shackle. The good insulating properties of plumage and horny skin of the legs, however, were dramatically reduced by wetting the contact sites. The highest currents were found, though, after exposing the skin. No further increase in current strength was observed at any of the electrode positions after the birds had been thoroughly soaked. This result does not support the assumption that a water film on the skin of moist birds will provide a short circuit for the stunning current.

AD Institut für Veterinärmedizin (Robert von Ostertag-Institut) des Bundesgesundheitsamtes, Postfach 33 00 13, D-1000 Berlin 38

SP englisch

PO Deutschland

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