This book prepared to explore the therapeutic, prophylactic, and functional use of probiotics which hold a significant place in human and animal health, provides up-to-date data and literature about their use as preventive/supportive agents in animal production. The effects of probiotics, which have been widely used in veterinary sciences in recent years for health, performance, and animal production purposes, and the production methods of recently trending strains are investigated, and important information about the functions and definition of probiotics are presented. This book will be beneficial to academicians, students, researchers, and industry stakeholders interested in the fields of Biochemistry, Obstetrics and Gynecology, Physiology, Genetics, Animal Nutrition, Animal Health, Economics and Management, Internal Medicine, and Parasitology in Veterinary Medicine.