If you have sycamore trees on or near your horse’s grazing, your horse could be at risk of Seasonal Pasture Myopathy (SPM), advises vets at the British Equine Veterinary Association (BEVA).

Seasonal Pasture Myopathy

Sycamore seeds are toxic and can cause the fatal disease, which is also referred to as Atypical Myopathy. It is caused by the toxin hypoglycin A, which is contained in tree seeds including that of the sycamore.

While sycamore seeds may not be directly palatable to horses, those grazing on poor quality pasture may ingest considerable numbers of them.

Horses kept in sparse pastures with an accumulation of dead sycamore leaves, dead wood and trees in or around the pasture and without access to supplementary hay or feed, are the most susceptible.

Keep your horse safe

Horse owners are advised to identify sycamore trees on or near grazing land and take steps to protect their horses:

·      Ideally move horses off pasture at times of risk, especially Autumn

·      Restrict access to seeds by using temporary fencing.

·      Ensure horses have access to good quality uncontaminated pasture.

·      Provide consistent access to clean, palatable hay or haylage to minimise the risk of horses being tempted to ingest seeds.

·      Do not fell trees, since doing so can lead to massive pasture contamination, further increasing the risks to horses

·      Discuss the risks and how to identify early clinical signs of SPM with your veterinary surgeon.

·      Be aware that a field without sycamore trees can still contain seeds spread by high winds or flood water.

Mark Bowen, Senior Vice President of BEVA said: “Please plan ahead and take steps now to prevent the risk of your horse contracting Seasonal Pasture Myopathy. It’s a devastating condition that can frequently be fatal despite treatment. If you are worried about the safety of your grazing speak to your veterinary practice for advice”.