This World Association for Animal Production (WAAP) Book of the Year series, now in its fourth volume, grows each year in its popularity. The authors are selected for their expertise in a specific field of the animal science. It is intended to constantly update animal scientists, industry representatives, animal breeders and extension service personnel with all the aspects considered relevant in each specific field of animal science. The book offers an updated and complete picture of the animal industry and of livestock science worldwide.We maintain the book's successful four section structure for easy access to the information. The first section of the book deals with livestock industry and possible application of research developments in the various continents. The following section reports updates about development of research in the various disciplines in the entire animal science field. The third section contains interesting articles on 'free subjects', of broad interest. We were told by readers of the previous volumes that this is the most popular section for the variety of actual and interesting topics for readers. The final section shows, like every year, detailed statistics of extraordinary importance in the animal industry.This book is generally recognized as one of the very few practical resources of comprehensive statistical information related to animal industry and it is considered by most important libraries to be a key instrument to offer their readers high-quality, updated relevant information on global animal science developments.