This guide to the management of poultry under both intensive and extensive systems is still the only text to present the practical aspects of poultry science concisely, conveniently, comprehensively and readably. Since the third edition was published in 1992 there have been many more developments in the poultry industry, which have made a new edition necessary. These include new systems which are environmentally and welfare 'friendly'; much more emphasis on hygiene and vaccines in disease control and the role of molecular biology and cloning; further advances in management with special reference to feeding, drinking, lighting and egg collection; advances in genetics; developments in housing; nutritional advances; and increasingly restrictive legislation concerning the safety to the public of poultry products (particularly zoonotic diseases and drug residues) and welfare. Another chapter, on organic poultry production, has also been added to this edition.