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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

Two regimens of lidocaine infusion in horses undergoing laparotomy for colicmembers
Various lidocaine protocols are described for horses undergoing Colic surgery. This interesting prospective, randomized clinical study compares the effects of administering or not administering a loading intravenous (IV) bolus of lidocaine prior to its constant rate infusion (CRI). Effects investigated during isoflurane anaesthesia were end-tidal isoflurane concentration (Fe′ISO), cardiovascular function, anaesthetic stability and the quality of recovery.
Thirty-six client-owned horses were enrolled.

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