The time of the year calves are born has little to do with what vaccine you might choose to use in calves, although some problems are more seasonal than others. The vaccination program should minimize risk for calves to develop common costly diseases (like some respiratory diseases) or less common diseases of high consequence (like brucellosis). Most vaccines are given after the protection that comes from colostrum (from the dam's first milk) has dropped. Usually the best time to vaccinate calves (from a disease-protection standpoint) is just prior to weaning. In some cases, a veterinarian may recommend vaccinating calves at a younger age to protect them against diseases that are a problem among younger calves on that particular farm (blackleg and overeating are good examples). Smaller, isolated herds may not require much of a vaccine program although, as the herd grows, the needs may change. A good way to start designing a vaccination program that fits your herd is to discuss it with a veterinarian familiar with your herd and the problems in your area.

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