Lung Pathology and Infectious Agents in Fatal Feedlot Pneumonias and Relationship with Animal and Treatment Information

Authors

  • Robert W. Fulton Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078
  • K. S. Blood Hitch Enterprises, Guymon, Oklahoma
  • Roger J. Panciera Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078
  • Mark Payton Department of Statistics, Oklahoma State University, Stillwater, OK 74078
  • Julia F. Ridpath USDA, ARS, National Animal Diseases Center (NADC), Ames, Iowa
  • J. T. Saliki Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078; Oklahoma Animal Disease Diagnostic Laboratory, CVHS, Oklahoma State University, Stillwater OK 74078
  • Lurinda J. Burge Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078
  • Anthony W. Confer Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078
  • R. D. Welsh Oklahoma Animal Disease Diagnostic Laboratory, CVHS, Oklahoma State University, Stillwater OK 74078
  • Bill J. Johnson Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078; Oklahoma Animal Disease Diagnostic Laboratory, CVHS, Oklahoma State University, Stillwater OK 74078
  • Amy Reck Department of Veterinary Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University, Stillwater, OK 74078

DOI:

https://doi.org/10.21423/aabppro20084399

Keywords:

Bovine respiratory diseases, BRD, feedlot, Mycoplasma spp, viruses, bacteria, fatal pneumonia, immunohistochemistry

Abstract

Bovine respiratory diseases (BRD) occurring in the feedlot represent the major disease entity during the feeding period. Several bacteria, viruses, and Mycoplasma spp are reported as causative agents. Feedlot BRD may occur at various times, although the early disease appearing after arrival and processing often receives the most attention. The diagnostician and clinician are faced with several clinical presentations and agents/lesions in the fatal cases.

The purpose of this study was to chart the fatal pneumonia cases over a one-year period in one Oklahoma feedyard, recording agent identification, observed pathology and animal treatment information. These cattle died either in the sick pen or suddenly in regular feeding pens without treatment. A clinical diagnosis of BRD was assigned to all cases charted. Samples of lung collected at necropsy (fresh and formalin fixed) were submitted for agent identification and histopathology. In the later stages of the study, skin samples were tested for BVDV by immunohistochemistry (IHC).

Cover image of the 41st Conference Proceedings: A herd of cattle standing in the field, framed by a cloudy sky. Yellow background.

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Published

2008-09-25

Issue

2008

Section

Research Summaries

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