When slaughtered, the carcasses, under rules adopted by the commissioner, shall be burned or covered with lime and buried, or may be shipped to a fertilizer or rendering plant; provided that the meat of animals reacting to the tuberculin or other approved test, but showing no physical indications of tuberculosis or brucellosis, may be used or sold for food under rules adopted by the department of health and human services or in accordance with the rules and regulations of the Bureau of Animal Industry of the United States Department of Agriculture under the federal meat inspection law.