Equine Atypical Myopathy Fears

Wednesday, 9 November 2011 10:30

Horse owners are being warned to keep a closer eye on their charges after several reports of Equine Atypical Myopathy having proven fatal to a number of affected animals. Two out of five diagnosed horses at Liphook Equine Hospital in Hampshire have died, leaving concerns that the outbreak may be particularly lethal.

There is no current known cause for EAM, so it is up to horse owners to be especially vigilant when looking for signs of affliction. The disease occurs at pasture during spring and autumn, and results in severe muscle damage. The disease is often fatal. Similarities have been drawn between EAM and Equine Grass Sickness, as both are pasture related diseases that are theorised to be caused by large changes in weather conditions.

There are a number of signs of EAM to look for, including muscle tremors, dark urine and collapse as well as weakness and stiffness at pasture that is not related to over exertion or unusual exercise. Coupled with these tell-tale signs of EAM, it was noted that in the days prior to be referred to Liphook Equine Hospital, the horses all displayed clinical signs that were not directly linked to EAM. These included stiffness and lethargy when ridden, a frenzied vocalisation, vigorous headshaking and repetitive neck spasms that resembled choking, without any obstruction.

It is believed that EAM is caused by toxins in grass being released when an adverse change in weather is seen. If a horse is affected by EAM, it is advisable the horse is removed from the pasture immediately to minimise the damage caused to the horse; you should also consider removing any other horses that are sharing the pasture as well, to minimise the likelihood of other animals contracting the disease. If any of these symptoms are seen in your horse, it is advised you get in contact with your vet immediately.