evaluation of health status of calves and the impact on feedlot performance: assessment of a retained ownership program for postweaning calves.the objective of this study was to evaluate animal health status at entry to a feedlot against feedlot performance and carcass value. there were 24 herds represented by 417 calves in a retained ownership program. the health status at entry was represented by the levels of serum antibody to infectious bovine rhinotracheitis virus (ibrv), bovine viral diarrhea viruses 1 and 2 (bvdv1a, bvdv2), parainfluenza 3 virus (pi3v), bovine respiratory syncytial virus (brsv), mannheimia haemolytica, and paste ...200212146889
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