Vaccines are economical but incorrect application methods can produce carcass damage, immunity failure or even infection. For optimum disease protection, most cattle need two vaccinations at four and six weeks as well as an annual booster. The first dose prepares the animal for disease while the second stimulates a high antibody level to fight the disease. Animals are not protected from disease until they produce high antibody levels. Over time antibody levels decline unless animals are exposed to the disease through natural infection or as an annual booster vaccine. Vaccinations will be most cost effective if disease incidence is high, animal values are high, mortality or production losses are high and vaccine costs are low. Speak with a. veterinarian to confirm disease suspicions before buying a vaccine.
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