Section 14D. All hogs which are affected with, or have been exposed to brucellosis shall be quarantined and tested by the director or his agent, or by an agent of the animal health division of the United States department of agriculture. The director may, in his discretion, slaughter any such hogs and their carcasses shall be disposed of in such manner as he may determine. No person shall transport hogs into the commonwealth until said hogs have been inspected and passed as healthy. Said inspection shall include certification of a negative brucellosis test within thirty days of importation into the commonwealth and a certificate of health by a veterinarian inspector of the animal health division of the United States department of agriculture or a veterinarian of the state of origin, authorized by said state and approved by said animal health division.