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Chronic copper toxicity in Boer goats

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SAC C VS disease surveillance report for February 2018

  • Chronic copper toxicity in a male Boer goat

  • Malignant catarrhal fever in beef cattle

  • Salmonella abortion in ewes

  • Enzootic ataxia in fallow deer (Dama dama)

February was cold, dry and sunny, with the mean temperature 1°C below the 1981 to 2010 average, and only 70 per cent of average rainfall. It was the second sunniest February since 1929 with 144 per cent of average sunshine hours recorded.

Cattle

Generalised and systemic conditions

Thurso diagnosed malignant catarrhal fever in three different herds during February. Beef cattle aged between 10 months and five years were affected and pyrexia, recumbency and conjunctivitis were reported in addition to neurological and respiratory signs.

Heparinised blood samples tested positive for ovine herpesvirus type 2 DNA by PCR in all cases. No history was provided regarding possible contact with sheep but most farms in the region are mixed sheep and beef units.

A two-year-old Limousin bull with a subcutaneous abscess at the right elbow became pyrexic and dull before death. Postmortem examination at Dumfries revealed a large endocarditis lesion on the right atrioventricular valve and small numbers of renal infarcts. Streptococcus uberis was isolated from the kidney, heart and abscess.

The same condition was diagnosed in a second herd, in a four-year-old Charolais bull that had lost weight and developed respiratory signs during the preceding two months. The same valve was affected and a myocardial abscess was found adjacent to the endocarditis lesion. Trueperella pyogenes was isolated in this case.

Endocarditis most commonly occurs secondarily to bacteraemia from chronic infection at a distant site

Endocarditis most commonly occurs secondarily to bacteraemia from chronic infection at a distant site. The right atrioventricular valve is most often affected in cattle.

Reproductive tract conditions

An aborted fetus submitted to Dumfries was found to have copious straw-coloured pleural and peritoneal effusions. The liver had a shrunken appearance with …

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