Current recommendations for the length of the dorsal hoof wall after trimming range from 60 to 85 mm; the most common recommendation being 75 mm. A British research study that examined internal claw structure using x-ray computed tomography (CT scan) suggests that the minimum external dorsal claw length recommendation should be increased to at least 90 mm for Holstein-Friesian cows over 4 years of age and at least 85 mm for younger cows.
Although housing and management practices play a dominant role in dairy cattle hoof health, genetics can influence the incidence and severity of lesions. A preliminary analysis of hoof lesion data collected in 3 Canadian provinces suggests that it may be possible to use this type of data in genetic selection. A project is currently underway to investigate the possibility of incorporating data collected electronically by hoof trimmers into the Canadian national DHI database. This would facilitate the collection of the large quantities of data required to accurately calculate breeding values for hoof health traits.
Researchers at the University of Wisconsin evaluated the hoof health of 719 heifers for 6 months prior to first calving. In the subsequent lactation, heifers with pre-partum digital dermatitis (DD) had lower milk production, poorer conception to first service, longer days open and were more likely to have multiple cases of DD.
The International Committee for Animal Recording (ICAR) has released a new guide to dairy cattle hoof disorders, including definitions and illustrations of the important foot and claw conditions. The new Claw Health Atlas will facilitate genetic improvement of dairy breeds by providing consistency in identification and recording of these conditions.
Non-healing (nh) bovine hoof horn lesions, characterized by penetration of the horn capsule and association with white line disease (nhWLD) and sole ulcers (nhSU) are frequently encountered in dairy herds endemically affected by digital dermatitis (DD). Lesions of this type are associated with more severe lameness, often leading to claw amputation or slaughter and they respond poorly to standard DD treatment. Researchers in Austria recently described a successful therapy for such lesions.
Results of a recent trial in the UK demonstrate that the use of non-steroidal anti-inflammatory (NSAID) medicine in addition to a therapeutic trim and supporting hoof block produced the highest cure rates for sole ulcers and white line lesions.
Zinpro has recently released a new DD Check App that facilitates recording of DD lesions across an entire group of animals. Once the required information on individual cows has been entered, a ‘DD Infection Model’ can be used to summarize DD infection status and predict future outbreaks.
In an interview with the veterinary journal InPractice, renowned dairy hoof health specialist Roger Blowey discusses cattle lameness and current thinking about the causes and control of digital dermatitis (DD).
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.