Agroecological requirements 20 Nutrient requirements 15 Animal nutrition 10 Animal Nutrition (General) 7 Food Composition and Quality 6 Animal Nutrition (Physiology) 4 Animal Nutrition (Production Responses) 4 Behaviour 4 Feed Composition and Quality 4 Feeds 4 Non-communicable Diseases and Injuries of Animals 4 Plant Nutrition 4 Animal behaviour 3 Animal physiology 3 Crop Produce 3 Crop quality 3 Energy requirements 3 Feed formulation 3 Feed intake 3 Irrigation 3 Meat Producing Animals 3 Minerals 3 Nutrition 3 Phosphorus 3 Plant Pests, (New March 2000) 3 Plant Physiology and Biochemistry 3 Plant Production 3 Plant diseases 3 Plant pests 3 Requirements 3