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Average initial antibody concentration by dam age in years for (A) bovine viral diarrhea virus type 1 (BVDV1), (B) bovine viral diarrhea virus type 2 (BVDV2), (C) bovine respiratory syncytial virus (BRSV), and (D) bovine herpesvirus 1 (BHV1). Prevaccination titers by dam age included for BVDV1 and BVDV2. a–hDifferent letters indicate significantly different dam ages at P < 0.05.
