This book is a quintessential text for anyone keen on studying and understanding reproduction mechanism in humans. It documents detailed description of existing knowledge of the hormones closely associated with the functions of testicles and ovaries. All topics covered in this book have been meticulously researched and catalogued to provide the readers with in-depth knowledge of all essential concepts and recent advancements in gonadotropin creation and secretion. The data has been presented in a manner that provides researchers, teachers, and students with a rational integration of the reproductive processes. Practical applications pertaining to reproductive management of various species have also been provided. This book is an extensive account of principal concepts on endocrinology and new findings in the area of gonadotropin function.