1. Department of Neurology, University of Rostock, Rostock, Germany
2. Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany
3. Institute of Genetics and Biometry, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany
4. Chair of Biophysics, University of Rostock, Rostock, Germany