This textbook explains the role of hormones in improving and monitoring the production, performance, reproduction, behaviour and health of animals. With its focus on livestock animals-cattle, pigs, sheep and horses as well as poultry and fish-the book uses an integrative approach to cover endocrine concepts across species. This updated edition is expanded to include new topics in each section, with updated references, revised study questions and an expanded subject index. It is an essential text for students in animal and veterinary sciences as well as those in academia and industry that are interested in applications of endrocrinology in animal production systems.