ZBVU.htm

NR ZBVU

AU Daly,C.C.

TI Concussion stunning in red-meat species

QU Seminar on pre-slaughter stunning of food animals, European Conference Group on the Protection of Farm Animals, Brussels, 2 - 3 June 1987

PT Proceedings

AB Captive bolt stunning was evaluated using the immediate abolition of evoked potentials (EPs) as the criterion for an effective stun. The role of bolt speed, and the mechanisms involved in producing loss of EPs were considered. Increasing bolt speed from 47 to 55 m/sec when stunning cattle decreased the incidence of EPs following the stun from 60% to less than 10%. However, further increasing the speed to 72 m/sec did not decrease the incidence further. It was found that the principal factor responsible for the abolition of EPs during concussive stunning was the impact of the bolt with the cranium rather than the tissues damage produced by the invasion of the bolt into the brain tissue. By measuring both the loss of speed of the bolt during the stun, to determine the loss of kinetic energy, as well as the acceleration imparted to the head of the animal during the stun, it was found that captive bolt stunning of cattle depends on optimising the diameter of the bolt as well as the bolt speed. Assessment of captive bolt stunning depends first on finding valid criteria by which stun can be judged effective or ineffective; in practical terms, such criteria must provide a reasonable indication of the onset and duration in insensibility following the stun. Once this crucial requirement is met, it becomes possible to investigate the mechanism by which insensibility is produced by this form of stunning and so produce guidelines that could ensure that effective stunning occurs with a high probability in a commercial context. This paper will describe what may be an appropriate measure of effective captive bolt stunning, as well as work carried out to establish the mechanisms involved in reaching this end-point.

SP englisch

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