The second edition of Biosecurity in Animal Production and Veterinary Medicine reflects a decade of innovation in a rapidly evolving field. Far more than an update, this edition includes over 50% entirely new content, with additional and expanded chapters, new concepts, and practical tools designed to help readers move from theory to effective on farm implementation of biosecurity. Written under the supervision of Jeroen Dewulf, one of the world's leading experts in animal biosecurity, the book brings together insights from more than 60 contributors from across the globe. Building on strong scientific fundamentals, the book emphasizes how to translate theory into effective on farm action, showing how real-world conditions (housing design, daily routines, equipment flows, species differences) shape disease risks and determine which measures truly work. As pathogens continue to emerge and production systems grow more complex, this edition offers clear, experience based tools to help farmers, veterinarians, consultants, and students design, evaluate, and improve biosecurity in practice. It is a comprehensive, hands on reference for anyone committed to preventing disease and strengthening animal health through practical, adaptable biosecurity.