ZBYF.htm

NR ZBYF

AU Forslid,A.

TI Transient neocortical and hippocampal EEG silence induced by one minute inhalation of high concentration CO(ind=2) in swine

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 Swine were exposed twice to 80% CO2 for 1 min during simultaneous recording of the EEGs from the neocortex and the hippocampus. In five of the animals myoclonic jerks started at 28 +/- 1 s of CO2 exposure and lasted for 6 +/- 2 s. Neocortical slow-wave activity and increased amplitude of the hippocampal (5-7 Hz) waves had developed before the period of myoclonic jerks. After this period the EEG activity declined, resulting in neocortical EEG silence at the end of the exposure which lasted for an average 1 min. The return of the neocortical EEG activity exhibited a pattern reverse to its disappearance, but was much prolonged in comparison to its extinction. Pre-exposure neocortical EEG pattern was not required until 3-5 min post-exposure. In eight out of 11 experiments the CO2 inhalation also inducted hippocampal EEG silence lasting for an average 30 s. The observed changes in the neocortical and hippocampal EEGs suggest that the present swine were unconscious already when they exhibited motor reactions.

SP englisch

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