Premises identification. An APHIS approved eartag, backtag, or legible tattoo bearing the premises identification number (PIN), as defined in this section, or a flock identification number, or a legible permanent brand or ear notch pattern registered with an official brand registry. Premises identification may be used when official individual animal identification is required, if the premises identification method either includes a unique animal number or is used in conjunction with the producer's livestock production numbering system to provide a unique identification number and where, if brands or ear notches are used, the animals are accompanied by an official brand inspection certificate. Clearly visible and/or legible paint brands may be used on animals moving directly to slaughter and on animals moving for grazing or other management purposes without change in ownership.
9 CFR § 79.1
Accredited veterinarian. A veterinarian approved by the Administrator in accordance with part 161 of this chapter to perform functions specified in subchapters B, C, and D of this chapter.