Department of Animal Production, Epidemiology and Ecology, Faculty of Veterinary Medicine, University of Torino, Grugliasco, Italy.|Department of Animal Production, Epidemiology and Ecology, Faculty of Veterinary Medicine, University of Torino, Grugliasco, Italy.|Department of Animal Production, Epidemiology and Ecology, Faculty of Veterinary Medicine, University of Torino, Grugliasco, Italy.|Department of Animal Production, Epidemiology and Ecology, Faculty of Veterinary Medicine, University of Torino, Grugliasco, Italy.