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New form of fescue-grass intoxication in horses
A new form of toxicity called equine fescue oedema is described in this new Australian report. 48 of 56 horses on six farms in different states of Australia were affected, and 4 horses died. The clinical and biochemical signs differ from those which have been described in earlier reports.

The clinical signs included inappetence, depression, and subcutaneous oedema of the head, neck, chest and abdomen. Affected horses had very low plasma albumin values.

All horses were grazing pastures that had been sown with varieties of Mediterranean tall fescue (Festuca arundinacea) that carry the endophyte known as Max P or Max Q.

It is proposed that a pyrrolizidine alkaloid, N-acetyl norloline, which is produced by the Max P endophyte, may be responsible for this new toxicity in horses.


Source: CA Bourke, E Hunt, R Watson (2009): Fescue-associated oedema of horses grazing on endophyte-inoculated tall fescue grass (Festuca arundinacea) pastures. In: Australian Veterinary Journal, Volume 87 Issue 12, Pages 492 - 498




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EQUINE

Theiler´s disease in a Trakehner caused by contaminated tetanus vaccinemembers
An 11â€yearâ€old Trakehner gelding was presented for evaluation of lethargy, decreased appetite, mild icterus, and elevated hepatic enzyme activities. Physical examination, serum chemistry results, and liver biopsy histopathologic findings were supportive of Theiler`s disease. Polymerase chain reaction (PCR) testing results of serum and liver tissue were positive for nonprimate (equine) hepacivirus (NPHV) and a novel equine parvovirusâ€hepatitis virus (EqPVâ€H). A serious and finally fatal problem, caused by contaminated vaccine.

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