To which ear is the official tattoo applied for a heifer vaccinated with RB1?

• A. Left ear
• B. Right ear
• C. Inner lip
• D. Ear tag suffices; no tattoo

Answer: (B)

The official tattoo for cattle vaccinated with RB1 is placed in the right ear. This location is used so regulators can quickly and permanently identify an animal as having received the RB1 vaccine, aiding traceability during inspections and disease control activities. Inner lip tattoos aren’t used for official cattle vaccination records, and ear tags are a separate form of identification rather than the official tattoo itself (they may accompany the tattoo but don’t replace it). So the right ear is the correct placement.