What letter begins the tattoo used to indicate a calf has been vaccinated for Brucella?

The tattoo used to indicate that a calf has been vaccinated for Brucella begins with the letter "R." This designation is part of a standardized system to track calves that have been vaccinated against Brucellosis, a significant bacterial infection that can impact both livestock and humans. The "R" stands specifically for "Rubella," which denotes the specific vaccine protocol followed for these cattle. Accurate identification through tattooing helps in monitoring and preventing the spread of the disease in cattle populations.

The other options are not used in this context; "Create" does not correspond to any vaccination status, while "V" is typically associated with other vaccine types but not specifically for Brucella vaccination in this system. The letter "B" usually signifies Brucella but would not be correct for recording vaccination as it represents the disease rather than the vaccination status. Thus, "R" is the correct answer in this system of veterinary practice.