Official calfhood vaccination may only be performed by an accredited veterinarian on female cattle and bison when more than 4 months of age and less than 12 months of age.
The veterinarian must follow the official calfhood vaccination protocol in the Brucellosis Eradication: Uniform Methods and Rules dated October 1, 2003. To be an official calfhood vaccinate, the vaccinated bovine or bison calf must be:
- Given a subcutaneous 2-mL dose of Brucella abortus Strain RB51 vaccine
- Permanently identified as a calfhood vaccinate by tattoo in the right ear using the following:
- The letter “R"
- The US Registered Shield and “V"
- The last digit of the year in which the vaccination was done
- Officially identified by official eartag or other official identification device
- Cattle vaccinated after November 5, 2024 must be identified with an official RFID eartag.
- If the animal is already identified with an approved means of official identification, an additional official eartag should not be used.
- Reported at the time of vaccination by submitting a completed VS Form 4-26 or Oregon Online Brucellosis Vaccination Record (through OVIS).