1. Department of Rural Building , University of Agriculture , Al. Mickiewicza 24-28, 30-059 Kraków , Poland
2. Department of Production Systems and Environment , National Research Institute of Animal Production , 32-083 Balice n. Kraków , Poland
3. Department of Engineering for Livestock Management , Leibniz Institute for Agricultural Engineering and Bioeconomy , Max-Eyth-Allee 100, 14469 Potsdam , Germany