"Agriculture" means the use of land for farming, dairying, pasturage, horticulture, floriculture, viticulture, nursery production, and animal and poultry husbandry and the necessary accessory uses for packing, treating or storing of goods produced on the premises, provided the operation of any such accessory use is secondary to that of normal agricultural activities. "Agriculture" does not include the commercial feeding of garbage or offal to swine or other animals.