As an arthropod-borne viral disease, BEF is primarily transmitted by mosquito vectors and is expected to spread throughout the southern regions of the country, persisting until cooler temperatures and frost reduce vector activity.
Dairy producers should conduct routine health assessments to identify early signs of BEF, which include:
- Lethargy and generalised malaise.
- Ptyalism (excessive drooling) and dysphagia (difficulty swallowing).
- Lameness and pronounced joint stiffness.
- Pyrexia (elevated body temperature) and myalgia, leading to anorexia, social withdrawal, and a tendency to seek shade and water sources.
Additionally, BEF has been associated with reproductive consequences, including spontaneous abortion in pregnant cows and transient sub-fertility in bulls, which may persist for up to six months post-infection.
Disease management
The severity of clinical symptoms is often correlated with body mass, with younger and lighter cattle experiencing a milder course of disease (one to three days).
In contrast, mature cows and bulls may require intensive supportive care.
Veterinary intervention is recommended for cases in which cattle remain recumbent for extended periods.
The administration of anti-inflammatory and antipyretic agents, under veterinary guidance, can significantly improve clinical outcomes.
Recommended supportive interventions:
- Ensure access to adequate shade, potable water and high-quality roughage.
- Implement assisted recumbency management by repositioning non-ambulatory cattle at least twice daily to mitigate secondary complications.
- Position recumbent cattle with their heads elevated above the abdominal plane to reduce the risk of fatal aspiration pneumonia and ruminal dysfunction.
Producers should also refrain from transporting recently recovered animals to processing facilities for several weeks to allow for complete muscle recovery and prevent potential carcase downgrades.
Furthermore, adherence to medication withdrawal periods is critical to ensuring compliance with food safety standards.
For further information on BEF management, dairy producers can access resources from Dairy Australia at: https://bit.ly/3Fy9Uqe
Dairy Australia Murray offers specialised workshops on herd health and disease management for regional dairy producers.
To register for upcoming training sessions, visit https://bit.ly/3wYZWY0 or consult your local Dairy Australia representative for tailored guidance.
– From Dairy Australia Murray.
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