ASPA 20 th Congress Bologna, June 11-13, 2013 Book of Abstracts Guest Editors: Andrea Piva, Paolo Bosi (Coordinators) Alessio Bonaldo, Federico Sirri, Anna Badiani, Giacomo Biagi, Roberta Davoli, Giovanna Martelli, Adele Meluzzi, Paolo Trevisi Official Journal of the Animal Science and Production Association (ASPA) ISSN 1594-4077 eISSN 1828-051X www.aspajournal.it Italian Journal of Animal Science 2013; volume 12 supplement 1