258 / FIELDS OF INSTRUCTION Programs leading to the degree Doctor of Philosophy, with emphasis on problems related to poultry science, may be obtained through the Department of Animal Science with staff members from Poultry Science directing the program. A departmental prerequisite for admission to graduate study is a sound background in the biological sciences. The following courses in related areas will be acceptable for graduate credit as part of the candidate's major: AL 607-Physiology of Reproduction; AL 650-Advanced Methods in Nutrition Technology; AL 653-Vitamins; AL 655-Mineral Nutrition and Metabolism; AL 657-Non-Ruminant Me- tabolism; DY 605-Endocrinology; FS 607-Food Chemistry; FS 641-Ad- vanced Human Nutrition. COURSES FOR ADVANCED UNDERGRADUATES AND GRADUATES PY 514-POULTRY NUTRITION. 4 credits PY 522-POULTRY BREEDING. 3 credits GRADUATE COURSES PY 607-ToPIcs IN POULTRY PRODUCTION. 2 or 3 credits Prerequisites: ADP 311, ADP 312. Offered primarily to Agricultural Extension workers and vocational agriculture teachers. When offered, this course is announced with one of the following topics specified: production principles, principles of handling and marketing, or nutrition. May be repeated with change of content up to a maximum of 9 credits. PY 612-AVIAN PHYSIOLOGY. 3 to 5 credits Prerequisite: VY 321. Environmental physiology, ovulation cycle and egg forma- tion, reproductive efficiency, experimental physiological techniques. PY 614-ADVANCED POULTRY NUTRITION. 4 credits Prerequisites: ADP 312, PY 514. Current topics in poultry nutrition; research techniques; formulation of experimental diets, and linear programming procedures and practice. PY 617-PROBLEMS IN EGG AND POULTRY MEAT TECHNOLOGY. 2 to 5 credits Prerequisite: PY 453. Physical, chemical, and bacteriological aspects in the preparation, storage, and marketing of eggs and poultry meat. May be repeated with change of content up to a maximum of 5 credits. PY 631-ADVANCED POULTRY MANAGEMENT. 4 credits Costs and returns in producing eggs, poultry meat, and baby chicks; poultry finances; organization of business. PY 660-GRADUATE SEMINAR IN POULTRY SCIENCE. 1 credit Discussion of current literature and developments in poultry science. May be repeated with change of content up to a maximum of 3 credits. PY 664-Topics IN GENETICS. 2 to 4 credits Identical with AL 664, AY 664, BTY 696, ZY 664. See AY 664. May be re- peated with change of content up to a maximum of 12 credits. PY 670-ADVANCED PROBLEMS IN POULTRY PRODUCTION. 1 to 4 credits Individual problems in fields of nutrition, genetics, physiology, poultry and egg marketing and processing, and management. May be repeated with change of content up to a maximum of 12 credits.