A descriptive analysis of the foot lesions identified during veterinary treatment for lameness on dairy farms in north Taranaki.

AIM

To analyse the records made during routine veterinary treatment of lame cows, to identify the types of lesions causing lameness of dairy cows in north Taranaki, their relative prevalence and distribution, and some of the cow-associated factors which affect these parameters.

METHODS

Data concerning cow age and breed, lesion type, lesion site, and whether the examination was a revisit were collected from records of veterinary visits between December 1995 and July 2007. Data were analysed on a single- or two-factor basis, using chi(2) and, where suitable, calculation of OR.

RESULTS

The total number of individual cow treatments recorded was 4,488. The most commonly recorded lesion was white-line disease (WLD) (42% of diagnoses at first examination), and the second was sole injury (29%). Heifers accounted for 19% of cases, similar to the expected replacement rate. Jerseys accounted for 18% of cases, lower than the proportion of purebred Jerseys in the region (27%). There was a significant effect of age and breed on the prevalence and distribution of lesions. There were also significant differences between lesion types in their location, which were also influenced by breed and age.

CONCLUSIONS

This study provided a comprehensive overview of the lesions causing lameness in dairy cattle in north Taranaki, and identified some of the factors which influence the development of lesions. More research is needed to better establish the aetiology and pathogenesis of lameness in cattle under New Zealand conditions.

CLINICAL RELEVANCE

This study provides baseline data with which veterinarians can compare their results to identify significant patterns on specific farms, which will suggest specific causal factors for lameness on those farms and thus better guide prevention programmes.