1. University of Bamberg,Chair of Mobile Systems,Bamberg,Germany
2. University of Oldenburg,Dept. of Computer Science,Oldenburg,Germany
3. LMU Munich,Faculty of Veterinary Medicine,Chair of Animal Welfare, Ethology, Animal Hygiene and Animal Husbandry, Department of Veterinary Sciences,80539 Munich,Germany
4. Bavarian State Research Center,Institute for Agricultural Engineering and Animal Husbandry,Freising,Germany