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Bovine respiratory disease (BRD) is consistently the most significant cause of morbidity and mortality in cattle in all ages worldwide. Owing to the multi-factorial aetiology of BRD which involves the interaction between environmental factors, host factors and pathogens, control of the disease can be difficult to effect within specific herds.

|  In 2017 , 609 submitted carcasses were diagnosed as BRD on Post-Mortem examination. 

Table 5.1: Count and relative frequency of pathogenic agents detected in BRD cases diagnosed on P-M examination, n=( 609 )
OrganismCountPercentage
Bacterial 279 46.3
Parasitic 126 20.9
Viral 104 17.2
No agent identified 87 14.4
Fungal 2 0.3

 

Table 5.2: Count and relative frequency of pathogenic agents detected in BRD cases diagnosed on P-M examination, n=( 609 )
OrganismCountPercentage
Dictyocaulus spp 126 20.9
No agent identified 85 14.1
Pasteurella multocida 78 12.9
Mannheimia haemolytica 63 10.4
RSV 52 8.6
Mycoplasma bovis 45 7.5
Trueperella pyogenes 39 6.5
Others minor organisms 38 6.3
IBR virus 23 3.8
Haemophilus somnus 18 3.0 

 

 

Fibirnous Bronchopneumonia image

Figure 5.1: Characteristic fibirnous bronchopneumonia caused by Mannheimia haemolytica. Photo:Cosme Sanchez-Miguel


Bovine Respiratory Disease (BRD)

Figure 5.2: The relative frequency of detection of selected bovine respiratory pathogens.