Effects of electrical water bath stunning current frequencies on the spontaneous electroencephalogram and somatosensory evoked potentials in hens

British Poultry Science
A B Raj, M O'Callaghan

Abstract

1. The effectiveness of water bath electrical stunning of chickens with a constant root mean square (rms) current of 100 mA per bird delivered for 3 s using 100, 200, 400, 800 and 1500 Hz sine wave alternating current (AC) was investigated in layer hens. The quantitative changes occurring in the electroencephalogram (EEG) and somatosensory evoked potentials (SEPs) were used to determine the effectiveness of stunning. The changes occurring in the EEG were evaluated using Fast Fourier Transformations (FFT) and the SEPs were averaged to determine whether they were present or abolished. 2. The results of FFT indicated that stunning of chickens with a constant rms current of 100 mA per bird using 100 or 200 Hz induced epileptiform activity in all the hens, immediately followed by a reduction in the total (2 to 30 Hz) and relative (13 to 30 Hz) power contents in the EEG frequency bands indicative of unconsciousness and insensibility. The SEPs were abolished in the majority of hens stunned with 100 Hz and all the hens stunned with 200 Hz. 3. By contrast, stunning using 400, 800 or 1500 Hz failed to induce epileptiform activity in all the birds, the total and relative power contents in the EEG frequency bands showed a substantial incre...Continue Reading

Citations

Sep 17, 2011·British Poultry Science·J A LinesT G Knowles
Jul 1, 1994·British Poultry Science·M C ApplebyC J Savory
Jun 19, 2014·Journal of the American Veterinary Medical Association·Cia L Johnson
Oct 21, 2015·Animals : an Open Access Journal From MDPI·Arlene GarciaJohn McGlone
Dec 4, 2015·Animals : an Open Access Journal From MDPI·Charlotte Berg, Mohan Raj
Feb 10, 2011·PloS One·Clementina M van RijnAnton M L Coenen
Jul 7, 2020·EFSA Journal·UNKNOWN EFSA Panel on Animal Health and Welfare (AHAW)Virginie Michel

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