Susannah Gross fed a selected group of pigs on her farm leftover stems, roots and leaves, and discovered that the pot-munching pigs had a much bigger appetite than the ones without the supplement to their diet, Inquisitr reported.
Four of her pigs were fed the leftovers of the plant and each gained between 20 and 30 pounds more than the rest of her swine.
The state of Washington legalized recreational use of marijuana in November, just before Gross teamed with medical marijuana grower Matt McAlman. The pair has plans to expand their experiments to other animals to see if they, too, get the munchies.
Medical marijuana has already been tested on animals not intended for consumption, according to Time, when a California veterinarian prescribed it for a pet suffering from cancer.
Doug Kramer, the veterinarian, used it when steroids and other medications were not alleviating the dog's pain, and determined that it restored some of itsappetite and provided therapeutic benefits toward the end of its life.
Mother Jones reported that it has also been used for injured horses and cats.
Research still has not determined whether any THC -- the active psychoactive ingredient in marijuana -- remains in the meat of animals headed to the slaughterhouse.