This book brings together the papers presented orally or as posters at the Sixth International Workshop on Modelling Nutrient Utilization in Farm Animals‎,‎ held in Wageningen‎,‎ The Netherlands‎,‎ 6 ‎- 8 September 2004‎.‎ The purpose of this book is to present current research in modelling nutrient digestion and utilization in cattle‎,‎ sheep‎,‎ pigs‎,‎ poultry and fish‎.‎ The book is organised into six sections that cover a range of topics and modelling approaches‎.‎ These are‎:‎ absorption and passage‎;‎ growth and development‎;‎ mineral metabolism‎;‎ methodology‎;‎ environmental impact‎;‎ and animal production and feed evaluation‎.‎ Deterministic‎,‎ stochastic‎,‎ empirical and mechanistic modelling approaches are described‎.‎ This book will be of significant interest to researchers and students of animal science‎,‎ particularly those concerned with nutrition modelling‎.‎