The commissioner of agriculture shall grant such state aid only on cash premiums paid on approved classes of:
- Cattle, swine, sheep, goats, farmwork stock, including mules shown to halter or farm vehicles, jack stock and light horses to halter;
- Poultry, eggs, and dairy products;
- Field, garden and horticultural products;
- Home economics displays;
- Junior agricultural projects; and
- Agricultural educational exhibits.