An excise tax of 10 cents ($0.10) per head shall be levied on all hogs sold in the Commonwealth for slaughter, and an excise tax of five cents ($0.05) per head shall be levied on all hogs sold in the Commonwealth as feeder pigs. For purposes of this tax, a slaughter hog or feeder pig is sold at the time and place the hog or pig is weighed for purchase and its purchase weight is recorded.
Va. Code § 3.2-2006