1. Swiss Federal Veterinary Office, Centre for Proper Housing of Ruminants and Pigs, Agroscope, 8355 Ettenhausen, Switzerland
2. Graduate School for Cellular and Biomedical Sciences, University of Bern, 3012 Bern, Switzerland
3. Digital Production Group, Agroscope, 8355 Ettenhausen, Switzerland
4. Research Institute for Farm Animal Biology, Institute of Behavioural Physiology, 18196 Dummerstorf, Germany