Bovine Actinomycosis (Lumpy Jaw): Cattle Welfare

Key Facts

• Caused by Actinomyces bovis infecting jaw bone after oral trauma from rough feed or teething
• Classic lumpy jaw is a hard, immovable swelling on the mandible or maxilla
• Soft tissue actinobacillosis (wooden tongue) is a separate but related condition affecting the tongue
• Long-term sodium iodide or potassium iodide treatment is most effective when started early
• Advanced cases with severe bone involvement carry a poor prognosis and may require culling

Welfare Considerations

Lumpy jaw significantly impairs cattle welfare through pain, difficulty prehending and chewing feed, and progressive weight loss. Affected animals may be excluded from competitive feeding at the trough, compounding malnutrition. Early detection and treatment with iodide therapy can arrest progression and maintain productivity, but treatment requires weeks to months of consistent administration. Providing affected animals separate access to highly palatable, easily chewed feed is an important welfare measure during treatment.

What You Can Do

• Inspect cattle regularly for jaw swellings, particularly during the teething period (2-3 years)
• Avoid feeding coarse, stemmy hay that causes oral trauma — fine-stemmed or silage is preferable
• Isolate and treat affected animals promptly with veterinary-prescribed iodide therapy
• Provide separate feeding stations for affected animals to ensure adequate intake
• Cull animals that fail to respond to treatment to prevent prolonged suffering