Section 267.640 - Certification of disease free herds or flocks, when - cancellation1. When an owner of livestock or animals or a flock of birds makes application to the state veterinarian and agrees to follow one of the several plans for the control and eradication of a specific disease from his herd or flock, the state veterinarian may certify the herd as being free from said disease when all livestock or animals or birds in the flock have passed all necessary tests and have met all of the requirements and conditions as may be adopted from time to time by the department and the United States Department of Agriculture for the specific disease for which the herd or flock is being certified.2. When the owner of any livestock or animals or flock of birds has fully complied with the requirements for the certification of his livestock herd or flock, animals or birds, the department shall issue a certificate approved by the department and the United States Department of Agriculture certifying to such fact and for such period of time as may be set forth in the rules and regulations for such certification.3. The certification of any livestock, animals or flock may be removed or cancelled by the state veterinarian when the owner of a herd or a flock has violated any of the rules and regulations for the maintenance of such status.