Cattle Digital Dermatitis: A Major Welfare and Production Challenge

Digital dermatitis (Mortellaro disease) is an infectious bacterial foot condition causing painful ulcerative lesions in cattle. It is one of the most prevalent welfare problems in dairy herds globally and a leading driver of lameness.

Key Facts

Digital dermatitis (DD) is caused by polymicrobial infection involving Treponema spirochaete bacteria and is now endemic in most intensive dairy herds worldwide
Prevalence in affected herds can exceed 70% of cows, with individual cows experiencing multiple recurrent episodes across a lactation
The condition causes painful erosive lesions on the skin above the hoof, most often at the interdigital space or heel; affected cows show characteristic foot lifting and reluctance to bear weight
DD progresses through five stages (M0–M4) from healthy skin through active ulceration to chronic scarring; stages M2 (acute active ulcer) cause the most severe pain
Lameness caused by DD significantly reduces feed intake, mobility, and lying time — all critical welfare indicators — and is associated with reduced fertility and increased culling risk
Footbathing with copper sulphate or antibiotic solutions remains the primary prevention strategy in many herds, though antibiotic resistance concerns are driving interest in alternatives
Improved hygiene — reducing slurry accumulation in passageways and on cubicle beds — is the most evidence-based environmental intervention for reducing DD incidence

Welfare Considerations

Digital dermatitis is among the most significant welfare problems in modern dairy systems because of its high prevalence, painful nature, and chronic recurrent character. Cows with active DD lesions show elevated pain indicators including lameness, altered gait mechanics, and reduced lying time. The discomfort of severe acute lesions (M2 stage) is substantial and comparable in intensity to other recognised pain conditions requiring analgesia. Current treatment with topical oxytetracycline spray is often effective for acute lesions but does not prevent recurrence — most animals develop the chronic M4 stage which flares repeatedly. Herds with poor hygiene management, inadequate hoof trimming schedules, and no systematic footbathing programmes carry the highest welfare burden. The condition's chronicity means that individual affected cows may spend months per year experiencing recurrent painful episodes. Integrating regular herd lameness surveillance — including locomotion scoring — into routine farm management is essential to ensure timely treatment and prevent acute lesions from progressing to chronic disease.

What You Can Do

Dairy farmers: implement regular locomotion scoring (at least quarterly) to identify and treat DD-affected cows before lesions progress
Support dairy certification schemes that require evidence of systematic lameness monitoring and DD treatment protocols
Choose dairy products from farms audited for lameness prevalence as a welfare outcome measure
Advocate for research into non-antibiotic footbath alternatives to reduce antibiotic usage while maintaining DD control
Support subsidised farm advisory services that help smaller dairy operations implement effective digital dermatitis management programmes