A large amount of qualitative information has been gathered on many aspects of pig biology over recent years, in areas such as genetics, growth and physiology, and welfare. It is now widely recognized that there is a need to use this data as a basis for the development of quantitative models, in order to further improve performance and productivity. This has been achieved in some areas, notably physiology, but no previous attempt at bringing together and integrating this material has been made. This book, written by leading researchers from Europe, the USA and Australasia, fills that gap. It begins with descriptions of the animal, its feed and its environment. The latest mechanistic mathematical models which describe particular physiological processes are then provided by specialists in those areas, taking into account the external factors which influence them. In conclusion, the advantages and implications of a quantitative approach to pig biology are discussed. The ideas presented will be essential reading for animal scientists, particularly applied physiologists, with an active interest in pigs and will also have relevance to research on other farm animals.