This unit introduces basic concepts in digestion and metabolism and their integration through endocrine functions. The unit includes metabolic hormones; the anatomy and physiology of the digestive system; the relation of nutrition to other constraints to animal production; principles of food analysis; energy and protein requirements of ruminants and non-ruminants; protein quality; nutritional roles of carbohydrates, proteins and lipids; minerals and vitamins; ecological factors in trace element deficiency; diet formulation. Practical work is mainly in animal experimentation related to production.