Researchers at the University of Guelph reported the results of a study designed to evaluate whether the ability of dairy cows to mount an immune response could be related to susceptibility to digital dermatitis (DD) infection. They showed that cows demonstrating a strong antibody-mediated response to an intramuscular antigen challenge had a lower prevalence of DD than cows showing an average or weaker response.
Gerard Cramer’s research group recently surveyed published research studies that examined the effects of hoof trimming on animal behaviour, physiologic changes and efficacy in reducing lameness. Although these studies revealed that hoof trimming may initiate a stress response, change behaviour, improve components of weight bearing, and reduce lameness in specific environmental conditions, few of the studies described the trimming method used in enough detail to determine effects of method on any of these outcomes.
Nigel Cook recently reviewed current footbath practices used in dairy herds, questioned the mechanism by which footbaths function, and reviewed the available scientific literature for guidelines to assist in the creation of best practices for their use. Based on that review, a summary of his recommendations for footbath design and management is presented.
Sara Pedersen, a prominent UK veterinary consultant who specializes in hoof health, presented her recommendations for digital dermatitis (DD) control at the recent UK Cattle Lameness Conference. Her ‘blitz’ treatment approach is designed to break the cycle of environmental contamination of the bacteria that cause DD, recognizing that these Treponemes only survive in slurry for up to 24 hours.
Many studies have demonstrated that lameness reduces milk production. But which hoof lesions are associated with the greatest milk losses? UK researchers compared the effects of specific hoof lesions on milk loss over complete lactations of 1,824 cows in 30 dairy herds.
While a good hoof trimming program is an essential component of lameness prevention, poor trimming technique can create lameness. The Lameness Committee of the American Association of Bovine Practitioners (AABP) has produced a fact sheet aimed at helping veterinarians and producers to objectively assess a herd hoof trimming program.
Prevention of DD focuses on biosecurity, maintaining good barn hygiene and routine foot bathing. Treatment of DD infections is typically only done by hoof trimmers at their infrequent visits—usually by applying antibiotic and bandaging for a few days. But, because new infections can rapidly advance, early detection and treatment is necessary to minimize new outbreaks of active lesions.
Over the past few years, researchers at the University of Calgary’s Faculty of Veterinary Medicine have been working to develop a practical way to routinely identify and treat painful DD lesions in the milking parlour.
Identifying lame cows is the first step in dealing with the dairy industry’s most important animal welfare issue. How does lameness affect lying behaviour? Could continuously-recorded lying time be used to help identify lame cows?
The adoption of a standardized, computer-based system for recording hoof trimming data (Hoof Supervisor® – HS) has made it possible to collect and analyse that data for application in herd benchmarking and genetic improvement. To that end, a Canadian research project is in progress to develop a process for data interchange between HS-equipped trimmers and the national Dairy Herd Improvement (DHI) database and on to the Canadian Dairy Network, the national dairy genetics organization. The ability of trimmers to download DHI data in advance of a herd visit will also aid in the selection of cows to trim.
When troubleshooting lameness problems, I use a structured approach starting with locomotion scoring, lesion analysis and assessment of the routine hoof-trimming and lame cow surveillance program. I then examine the risk factors for each of the key hoof lesions and finish with a review of feeding practices. From this examination, we can create a herd specific action plan designed to maximize impact on the key hoof lesions on the farm.