Mo. Rev. Stat. § 267.485
Official calfhood vaccination for brucellosis shall mean that such animals are vaccinated with an approved vaccine when such animal is of an age as may be fixed by rules and regulations of the department. Such vaccination shall be administered by an accredited veterinarian in good standing, approved by the department, who shall execute and give the owner a certificate in a form approved by the department, certifying an identification of the animal or animals, their age, the serial number of the vaccine, the expiration of the effective date of the vaccine, the dosage used, and if the animal or animals were tested for brucellosis prior to the vaccination, the result of such test. Grade animals vaccinated in compliance with this section shall be permanently identified by a tattoo symbol and a vaccination tag, both as approved by the department, and such tags may be provided at cost by the department. Registered animals shall be identified by the registration tattoo, or the registration name and number of such animal.
(L. 1955 p. 5 § 267.285)