Final answer:
The Brucellosis vaccine is specific to a certain age group of cattle, usually administered to female calves to prevent reproductive issues and zoonotic transmission.
Step-by-step explanation:
The Brucellosis vaccine is only given to cattle of a certain age group. This vaccine is particularly important because Brucella infection in cattle can lead to reproductive problems and the transmission of the disease to humans. Vaccination for brucellosis is often restricted to female calves, and it is done under strict regulations because the vaccine contains live bacteria, which can cause disease if administered improperly or to the wrong age group.