When such animals are found to have any contagious or infectious disease, they shall immediately be slaughtered by, and at the expense of, the importer or owner, or held in strict quarantine, if the disease is curable, under rules adopted by the commissioner; and when slaughtered the carcasses shall be subject to the provisions of N.H. Rev. Stat. § 436:17 relating to the disposition of the same; but in no case shall the importer or owner retain the hide of any animal infected with glanders or anthrax, nor shall the carcass of any animal infected with glanders or anthrax be shipped to a fertilizer or rendering plant.