The board shall adopt rules prohibiting the driving or transporting into this state of any horses or other equidae that have not tested negative to the AGID, or Coggins, test or a United States department of agriculture-approved equivalent test for equine infectious anemia within twelve months prior to the date of entry, the evidence of which test result shall be shown on a health certificate; excepting from regulation only those foals accompanied in shipment by a negative-tested dam, those horses or other equidae consigned directly to slaughter.