Implementierung der Schuss-Schlag-Betäubung im zugelassenen Schlachtbetrieb
Beschreibung
vor 22 Jahren
A total of 1248 animals was stunned in two EU approved
slaughterhouses using either cartridge activated or pneumatic
concussion stunning devices. In total, 12 % of the animals had to
be stunned twice. If the shooting position deviated from the
midline the rate of re-stunning increased considerably. In the main
experiment carried out in the larger of the two slaughterhouses
67.8 % of the animals lay without any movement immediately after
falling out of the stunning box. Pathological examinations carried
out after splitting the skull longitudinally showed a low to high
degree of haematoma formation in the brain in more than half of the
animals stunned by concussion stunning. The haematomas were
localized on the frontal side of the brain immediately beneath the
stunning position and on the opposite side of the brain stem. The
haematomas occurred also in animals the lamina interna and the dura
mater of which were not injured. Following concussion stunning 69
electrocardiograms were made. Except for one animal which could not
be evaluated all animals showed normal heart activity corresponding
to that observed after captive bolt stunning. The examination of
several meat quality parameters did not yield any clear deviations
from meat maturation after captive bolt stunning. Meat color, pH
value and temperature were measured in the Musculus longissimus
dorsi. The most important conclusion of this study is that the
application of concussion stunning can improve the safety of the
slaughterhouse workers in several critical positions of the
slaughtering line (stunning, hoisting and sticking). As long as the
dura mater remains intact, the worker responsible for stunning does
not come into contact with potentially infected brain material. In
addition, after concussion stunning carcass stillness was clearly
improved in comparison to captive bolt stunning. However, the
results concerning animal welfare are still unsatisfactory as too
many animals have to be stunned twice. With respect to consumer
protection concussion stunning also does not offer advantages over
captive bolt stunning since the distribution of nerval tissue via
blood cannot be ruled out because of the haemorrhages occurring in
the brain.
slaughterhouses using either cartridge activated or pneumatic
concussion stunning devices. In total, 12 % of the animals had to
be stunned twice. If the shooting position deviated from the
midline the rate of re-stunning increased considerably. In the main
experiment carried out in the larger of the two slaughterhouses
67.8 % of the animals lay without any movement immediately after
falling out of the stunning box. Pathological examinations carried
out after splitting the skull longitudinally showed a low to high
degree of haematoma formation in the brain in more than half of the
animals stunned by concussion stunning. The haematomas were
localized on the frontal side of the brain immediately beneath the
stunning position and on the opposite side of the brain stem. The
haematomas occurred also in animals the lamina interna and the dura
mater of which were not injured. Following concussion stunning 69
electrocardiograms were made. Except for one animal which could not
be evaluated all animals showed normal heart activity corresponding
to that observed after captive bolt stunning. The examination of
several meat quality parameters did not yield any clear deviations
from meat maturation after captive bolt stunning. Meat color, pH
value and temperature were measured in the Musculus longissimus
dorsi. The most important conclusion of this study is that the
application of concussion stunning can improve the safety of the
slaughterhouse workers in several critical positions of the
slaughtering line (stunning, hoisting and sticking). As long as the
dura mater remains intact, the worker responsible for stunning does
not come into contact with potentially infected brain material. In
addition, after concussion stunning carcass stillness was clearly
improved in comparison to captive bolt stunning. However, the
results concerning animal welfare are still unsatisfactory as too
many animals have to be stunned twice. With respect to consumer
protection concussion stunning also does not offer advantages over
captive bolt stunning since the distribution of nerval tissue via
blood cannot be ruled out because of the haemorrhages occurring in
the brain.
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