Modelling is a useful tool for decision making in complex agro-industrial scenarios. Containing a selection of the papers presented at the International Symposium of Modelling in Pig and Poultry Production 2013, this book brings together the best and most recent academic work― with an emphasis on nutrition― on modelling in the pig and poultry industries. It reviews basic modelling concepts, descriptions and applications of production models and new methods and approaches in modelling.