This volume is written primarily for veterinary students, animal science graduate students in physiology and practising veterinarians who wish to update their general knowledge of endocrinology. Emphasis is placed on instructional figures, flow diagrams and tables while text material has been held to a minimum. Over 200 multiple-choice questions gauge the reader's capacity to effectively understand the subject matter. In general, the endocrine system is first defined and described, and then each gland is discussed separately. Where appropriate, common endocrine disorders have also been included. A primary goal in the preparation of this text has been to concisely elucidate the endocrine mechanisms responsible for maintaining homeostatic control of important physiologic variables, and to assist the reader in understanding common pathophysiologic deviations from normal.