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WE wish to report a severe outbreak of non-healing hoof lesions in grazing herds in the Osorno region of southern Chile. During a five-week consultancy visit to investigate the cause of an increase in lameness in dairy cows in Chile, one of us (NC) noted that many cows had developed a lesion that he had not previously seen in his extensive experience of lame cows in New Zealand. The lesions were described as non-healing toe and white line lesions, which ‘smelled like nothing I have previously smelled in New Zealand’. Many had previously been repeatedly treated by local farmers and hoof trimmers, using paring and topical application of chlortetracycline, with little or no response. A typical example is shown in Fig 1. In one of the first herds to be investigated there were 200 lame …
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