The British Columbia Dairy Hoof Health Group has created HARP-DD (Hoof Assessment and Recommended Practices for Digital Dermatitis Control), a risk assessment tool aimed at helping to reduce the prevalence of digital dermatitis (DD) by identifying and addressing on-farm risk factors for infection.
Few claims about the efficacy of products used to treat digital dermatitis (DD) are supported by any conclusive scientific evidence. Not all treatment trials provide conclusive evidence – many reported trials are poorly designed, leading to bias towards a particular outcome.
A recent study considered a large number of DD treatment trials, eliminating all but four that were rigorously designed to give conclusive, unbiased results.
Researchers at the University of Wisconsin have demonstrated that acute digital dermatitis (DD) in 16 – 25 month old heifers can increase heel height, claw angle and depth of the interdigital cleft. DD lesions were also associated with significant increases in heel horn erosion.
Previous studies have demonstrated that multiple bacterial species are associated with digital dermatitis (DD) lesions, with spirochetes being the most commonly identified organism. A recent study at Iowa State University demonstrated that, although spirochetes are the predominant bacteria present in the later stages of lesion development, many other bacterial species are involved in the earlier stages.
The frequent claim that copper sulfate (CuSO4) is effective in controlling digital dermatitis (DD) is supported by little scientific evidence. Only one of seven articles evaluated in a recent study found a positive effect of CuSO4. In addition, most of these studies are relatively small, do not compare CuSO4 with no treatment (negative control), and, often, no clear positive effect of CuSO4 is demonstrated. Until better studies have been conducted, the efficacy of CuSO4 foot baths in controlling DD remains largely unproven.
Copper sulfate disposal from dairy farm footbaths can result in significant accumulation of copper in soil which may be detrimental to crop growth. Regulators in several US states have established maximum soil loading rates for copper.
Three new factsheets address the causes, prevention and treatment of each of the 3 most common dairy cattle claw lesions: digital dermatitis, sole ulcer and white line lesion. The factsheets are written in plain language, designed to help producers deal with these lesions.
To estimate the accuracy of subjective locomotion scoring, 7 experienced observers were asked to score video recordings of the locomotion of 58 cows on two different occasions. Agreement between scores for each cow assigned by individual observers on the 2 occasions averaged 67.4%. Agreement between observers scoring the same cows averaged only 58.2%
Hoof blocks, fixed under one claw to allow the other claw to recover from corrective trimming, are used to reduce pain during the healing process. A German trial compared the used of uniform thickness wood and flexible synthetic hoof blocks with wedge-shaped blocks of the same materials.
There are 2 main causes of thin soles in dairy cattle:
1. an abrasive floor, particularly a new one in a barn cows have recently moved into;
2. excessive hoof trimming.
Without immediate intervention, some cows will completely lose the sole horn and the underlying corium, which is especially thin at the tip of the toe, will be uncovered. Therefore this area is very vulnerable for ascending infections. An alternative treatment for cattle with thin soles was presented at the recent Lameness Conference in Bristol UK.