1. Laboratory for Precision Livestock Farming (PLF), Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Centre, Rishon LeZion 7505101, Israel;
2. Department of Environmental Science and Policy, Università degli Studi di Milano, 20122 Milan, Italy;
3. Alltech, Inc., Nicholasville, Kentucky 40356, USA;
4. Natural Resources Institute Finland (Luke), Production Systems, FI-00790 Helsinki, Finland;