4 Tex. Admin. Code § 47.14
(b) Each calfhood-vaccinated animal must be permanently identified as vaccinates by tattoo and by official vaccination eartag. If the animal is already identified with an official eartag before vaccination, an additional official eartag is not required. Vaccination tattoos must be applied to the right ear. For Brucella abortus strain RB 51 vaccinates the tattoo will include the United States Registered Shield and "V" which will be preceded by a letter "R" and followed by a number corresponding to the last digit of the year in which the vaccination was done. Official vaccination (orange) eartags must be applied to the right ear. Individual animal registration tattoos or individual animal registration brands may be used for identifying animals in place of official eartags if the cattle and/or bison are registered by breed associations recognized by VS. Official calfhood vaccinates are allowed to be re-tattooed by an authorized veterinarian designated by the State Veterinarian, or by a Federal or State representative, provided that:
Source Note:The provisions of this §47.14 adopted to be effective February 4, 2014, 39 TexReg 486.