Novartis - Vaccinate the cow and protect her calf through the colostrum against E. coli scours plus Clostridium perfringens Type C. Inject a single 1 ml dose IM 8-16 weeks prior to calving; can be used in conjunction with Scour Boss 4 to provide the most complete scour protection on the market. Annual revaccination is recommended. Vaccinate dairy cows during dry off period. 60 day withdrawal.