Pfizer - For vaccination of healthy cattle for an aid in preventing IBR, BVD Type 1 & 2, Pi3, BRSV. may be administered to pregnant cattle provided they were vaccinated according to label directions. May also be administered to calves nursing pregnant cows provided their dams were vaccinated according to label directions with any Bovi-Shield FP or PregGuard FP vaccine within the  last 12 months. Dosage: 2ml IM followed by BoviShield BRSV in 3-4 wks. Revaccinate annually. 21 day withdrawal