Bovine respiratory disease
Bovine respiratory disease (BRD) is the most common cause of illness and death in Australian feedlot cattle. It is most common in the first four weeks after entry to the feedlot.
BRD is caused by a combination of stress and disease causing agents, including viruses and bacteria.
Conditions when BRD is likely to occur
- During the first four weeks when cattle enter a feedlot (unstressed cattle on pasture are rarely affected).
- Stressful conditions, including recent weaning, saleyards, transport, injury, dehydration, co-mingling, pen competition, pen 'add-ons' and movements, handling, weather extremes, dust and feed and water changes.
Identifying and diagnosing bovine respiratory disease
Early identification of affected cattle is vital and pens of cattle should be checked daily.
Clinical signs to look for include:
- Depression and loss of interest in surroundings.
- Lethargy and unwillingness to move.
- Extended head.
- Droopy ears.
- Discharge from the eyes, nose and mouth.
- Rapid shallow breathing.
Diagnosis of the disease causing agents involved in bovine respiratory disease on your property will require assistance from your veterinarian. Knowing the specific cause allows specific prevention strategies and treatment protocols to be put in place.
Prevention strategies for bovine respiratory disease
- Reducing stress on cattle in the first four weeks in the feedlot.
- Improving adaption of cattle to the feedlot environment by selecting cattle directly from breeders and from producers who yard wean calves, backgrounding cattle prior to entry to the feedlot.
- Vaccinating against respiratory diseases during backgrounding.
- Avoiding sudden feed and water changes.
- Minimising pen add-ons and movements.
- Controlling bovine respiratory disease in feedlot cattle
- New South Wales Department of Industry & Investment publication: Cattle health in feedlots