Whenever any animal has been adjudged by the board to be infected with bovine tuberculosis or brucellosis, the board or its authorized agent shall serve a written notice of its decision upon the owner or keeper of the animal before the condemned animal is killed. The animal must be destroyed within fifteen days after notice of condemnation, in either a federal-inspected or state-inspected slaughtering plant, or under the supervision of an agent of the board. The fifteen-day period may be extended by the state veterinarian if that person deems it advisable due to the circumstances involved in each case, and the extension must be in writing. The notice must advise the owner or keeper of that person’s right to protest against the diagnosis and determination of the board within twenty-four hours after the service of the notice upon that person. If no protest is made within such time by the owner or keeper of the condemned animal, it must be appraised in the manner provided in this chapter.