Agricultural, floricultural and horticultural pursuits, including but not limited to general farms, greenhouses, plant nurseries, truck gardens, dairy husbandry, animal husbandry and the raising of bees, poultry and livestock, together with all customary buildings and other structures necessary for the production and storage of the products of such pursuits, provided that no buildings, pens and runways for the confinement of livestock or poultry and no manure or other dust-producing substances shall be stored within 100 feet of any lot line.