Prophylactic administration of hyperimmune serum when processing feedlot cattle

Abstract

128 steer calves were given a commercially available hyperimmune serum (5 or 10 ml/100 lb body weight, s/c) immediately after processing at a feedlot, and 64 were processed but not treated. Processing included immunization with IBR IPV virus, bovine diarrhoea virus, parainfluenza-3 virus, Haemophilus somnus and clostridial toxoid vaccines. The hyperimmune serum had little or no effect on prevalence of respiratory disease, body weight gain or serological response to the vaccines.