Unit 6 -- Part 4
Bovine Respiratory Disease
J. Nielsen

 

Factors contributing to bovine respiratory disease (BRD)

  • Stress
  • Immune suppression/failure of passive transfer
  • viruses -- infectious bovine rhinotracheitis (IBR), bovine viral diarrhea virus (BVDV), parainfluenza type 3 (PI3), bovine respiratory syncytial virus (BRSV)
  • bacteria -- Pasteurella hemolytica, Haemophilus somnus

Diagnosis

  • Careful visual OBSERVATION
  • depression, off feed, separation from group, cough, nasal discharge, fever
  • blood testing
  • necropsy

Prevention

  • passive transfer of antibodies (colostrum)
  • adequate ventilation
  • cleanliness
  • vaccination, preconditioning

There will be an in-class viewing of a video illustrating visual observation of calves with bovine respiratory disease, and management procedures to minimize the disease complex. There will also be class discussion of a case example of an outbreak of disease caused by one of the viruses of the respiratory disease complex.

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