Farms, dairies, nurseries, truck gardens, greenhouses and natural ice-harvesting activities and buildings or structures accessory thereto on parcels of more than five acres of land. On parcels of less than five acres of land, the keeping and raising of poultry, livestock and pigeons, whether raised for the table or other purposes, or other like objectionable uses are prohibited. The keeping and raising of hens may be allowed by special permit under § 180-8.1