Proper Injection Sites to Remember at Calf-Working Time Spring calving seasons are well underway, if not nearly completed in Oklahoma. The months of April and May are traditionally the time when “spring roundups” take place. This is the time that large and small cow/calf operations schedule the “working” of the calves. As the majority of the calves reach their second month of life, it is time to castrate the male calves (if this has not already been done) and immunize all of the calves to protect them against blackleg. In some situations, calves may be vaccinated for the respiratory diseases, i.e. IBR and BVD.

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