- 37 - other facilities necessary for the training of teachers of agriculture. These facilities shall include a farm owned and operated by the institu- tion, with sufficient acreage for the production of the major crops common to the area on a scale large enough to permit the demonstration of approved farm practices (including the use of major farm equipment) and to provide land for a comprehensive agricultural research program. Whenever instruction is offered in any of the following classes of livestock or poultry, the following minimum number of birds or animals shall be owned and managed by the college. In all cases, the institution should maintain a minimum of three classes, including at least one class of cattle. Dairy One practical breeding unit of at least 20 milking cows Beef One practical breeding unit of at least 15 breeding cows, a bull, and 20 feeder and stocker cattle Sheep A farm flock of 25 breeding ewes Poultry 1, 000 birds, including layers, broilers, and turkeys Swine One breeding unit of 8 to 10 sows. The institution shall provide classroom and scientific laboratory facilities of recognized college standard for food processing and preser- vation (including meats or dairy products), plant pathology, horticulture, crops, soils, farm machinery, farm mechanics, soil conser- vation, livestock, poultry, livestock sanitation and animal hygiene, and any other areas partic- ularly- applicable to the State. In the field of related science, laboratories shall be available for work in bacteriology, botany, chemistry, genetics, physics, and zoology. The institution shall maintain a general library of recognized'college standard, including materials in the field of agriculture. The agriculture library shall contain a comprehensive list of reference books in the various fields, a complete