Digital Dermatitis in Cattle: Welfare and Control
Disease Overview
Digital dermatitis (DD) is a bacterial infection of the skin around the feet, particularly the interdigital space and heel bulbs. It is caused primarily by spirochaetes (Treponema spp.) and is highly contagious. It exists in multiple stages (M0-M4 on the Döpfer score): from pre-lesion to active ulcerative to chronic forms. It spreads rapidly through herds via slurry contamination.
Welfare Consequences
DD causes significant pain. Even small active lesions (M2 stage) cause severe lameness: affected cattle shift weight, show reluctance to stand, and reduce time at the feed barrier. Locomotion scoring shows clear welfare impairment. Chronic DD causes persistent discomfort and reduces feeding behaviour, milk production, fertility, and body condition. It is one of the leading causes of premature culling in dairy herds.
Treatment
Topical antibiotics (oxytetracycline spray) applied to active lesions are effective. In mild cases, spraying without restraint is acceptable; severe or chronic lesions benefit from footbath treatment plus individual topical therapy. Systemic antibiotics are rarely needed. Ensuring complete lesion coverage is critical. Follow-up scoring identifies non-responders requiring further treatment.
Footbathing Protocols
Footbathing with copper sulphate (2-5%) or formalin (3-5%) reduces transmission and treats early lesions. Regular footbath use (3-5 times per week) is most effective. Footbath solution must be replenished regularly (typically every 200 cow passes). Footbath position, design (adequate depth and length), and maintenance are critical. Antibiotic footbaths (oxytetracycline) are also used in outbreak situations.
Environmental and Herd Management
Reducing slurry exposure reduces transmission: frequent scraping of passages, well-designed housing with minimal standing time on slurry, and adequate drainage. Foot trimming (routine and remedial) identifies lesions early. Herd-level recording and monitoring of lameness and DD prevalence guides control effectiveness. Farms should target DD prevalence below 10% as a welfare benchmark.