Sleep in dairy cows recorded with a non-invasive EEG technique

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Ternman , E , Hänninen , L , Pastell , M , Agenäs , S & Peetz Nielsen , P 2012 , ' Sleep in dairy cows recorded with a non-invasive EEG technique ' , Applied Animal Behaviour Science , vol. 140 , no. 1-2 , pp. 25-32 .

Title: Sleep in dairy cows recorded with a non-invasive EEG technique
Author: Ternman, Emma; Hänninen, Laura; Pastell, Matti; Agenäs, Sigrid; Peetz Nielsen, Per
Contributor organization: Departments of Faculty of Veterinary Medicine
Production Animal Medicine
Department of Agricultural Sciences
Research Centre for Animal Welfare
Date: 2012
Language: eng
Belongs to series: Applied Animal Behaviour Science
ISSN: 0168-1591
Abstract: Sufficient sleep time is important for both an adequate metabolic system and the immune function. Sleep in animals is often estimated by behavioural observations, or recorded on restrained animals with invasive electroencephalogram (EEG) techniques, which might affect sleep patterns. Earlier studies on sleep in cows showed that they sleep about 4 h per day and drowse almost twice the time. The aim of this study was to record and differentiate between vigilance states in dairy cows using a non-invasive EEG method. Brain activity (electroencephalography, EEG), eye movements (electrooculography, EOG) and muscle activity (electromyography, EMG) were recorded for 6 h per animal using surface-attached electrodes to measure different vigilance states. Behaviour registrations from direct observations were combined with the EEG data in order to confirm the identification of different vigilance states from the EEG, EOG and EMG recordings. 8 dry dairy cows, lactation number 1–8 and age 3–11 years, of the Swedish Red breed from the research herd at Kungsängen Research Centre, Uppsala, Sweden, were used in the study. The EEG recordings showed that non-rapid eye movement (NREM) sleep displayed low frequency waves, sometimes with slow wave activity. Rapid eye movement (REM) sleep and alert wakefulness shared similar features of desynchronised waves with varying frequency and could be differentiated by reduced neck muscle activity during REM sleep. The main conclusion from this study is that it is possible to distinguish different vigilance states in dairy cows using surface-attached EEG electrodes.
Subject: 413 Veterinary science
dairy cows
sleep stages
Peer reviewed: Yes
Usage restriction: restrictedAccess
Self-archived version: submittedVersion

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