Affiliation: | 1. Department of Veterinary Medicine, University of Perugia, Perugia, Italy;2. Department of Agricultural, Food and Environmental Sciences, Polytechnic University Marche, Ancona, Italy;3. Council for Agricultural Research and Economics Research Unit for Swine Husbandry, San Cesario sul Panaro, Italy;4. Department of Mathematics and Computer Sciences, University of Perugia, Perugia, Italy |