The carcass of every animal duly condemned for bovine tuberculosis and slaughtered under the provisions of this chapter shall be examined by a veterinarian or physician designated by the commissioner for the purpose of determining whether or not disease existed in such animal. Such postmortem examination shall be under rules adopted by the commissioner, and the report thereof shall show conditions found upon such examination duly verified by the person making such examination. Such report shall be filed with the commissioner, and a copy shall be sent or delivered to the owner or person in possession of the animal so examined.