Calfhood Vaccination (Official Calfhood Vaccination)-Vaccination with Brucella abortus Strain 19 for heifers between 4 and 10 months old. The best age is 5 months. Calfhood vaccination must be by a federally accredited veterinarian (Most large animal veterinarians are federally accredited). Vaccination is necessary for heifers being shipped into some states; therefore, many sales require that all heifers sold be calfhood vaccinated so as not to restrict the potential market. Official calfhood vaccinates are marked in the right ear with an official orange ear tag and a special tatoo, denoting the quarter and year of vaccination. The decision to have heifer calves vaccinated for brucellosis should be based on the advice of the herd's veterinarian and depends on the marketing plan of the herd.

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