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How to Identify, Manage & Prevent Equine Gastric Ulcer Syndrome (EGUS)

About Equine Gastric Ulcer Syndrome (EGUS) how to dressage

In 2009, a study commissioned in Denmark revealed that a startling 83% of the sport and leisure horses surveyed had gastric ulcers.

So, what are gastric ulcers and how can you tell if your horse has them?

What are gastric ulcers?

The correct veterinary term for gastric ulcers is Equine Gastric Ulcer Syndrome (EGUS).

It’s a surprisingly common complaint that can affect any breed, type or age of horse.

EGUS is widely considered to be a problem that has occurred as a result of modern feeding regimes and stable management practices.

In order to understand what causes gastric ulcers, it’s necessary to understand a little about the physiology of the horse’s stomach.

The horse’s stomach and gastric ulcers

The horse has a small stomach relative to its size.  In fact, the stomach is roughly the same size as a rugby ball.  The organ sits on the left side of the horse’s body, just behind the shoulder blade.

The stomach is split into two areas, separated by a line called the margo plicatus.

The upper area of the stomach (squamous mucosa) is lined with tissue that is similar in nature to that found inside of your mouth.

The lower part (glandular mucosa) contains glands that secrete acid and has a protective mucosal layer.

Horses evolved to be ‘trickle feeders’, spending many hours wandering and foraging as they did so.

Consequently, the equine stomach is designed to receive only small amounts of roughage at frequent intervals and to never be left completely empty.

Ulcers form in the horse’s stomach as a direct result of exposure to excess gastric acid, which can occur if a horse is exercised on a completely empty stomach.

The stomach acid is not restricted or soaked up by roughage in the horse’s stomach and therefore splashes onto the tissue in the upper stomach that is not protected by a mucosal lining as the horse moves.

The acid ‘burns’ the sensitive stomach wall, causing painful ulceration.

The severity of gastric ulcers can vary from tiny areas of inflammation to deep craters, filled with dead or dying tissue.

A scoring system from 0 to 4 is applied by vets to grade the severity of ulcers.

What causes EGUS?

There are a number of causes of EGUS including:

  • feeding low forage/high concentrate diets
  • long periods spent stabled with little or no forage intake
  • intense exercise
  • stress, e.g. from traveling
  • lack of access to clean water

It is extremely important that horses have access to a continual supply of forage.  This keeps the stomach lined and the saliva that is produced whilst trickle feeding also helps to effectively neutralize stomach acid.

What are the signs of EGUS?

Many horses don’t show any symptoms of EGUS at all.  Some owners just report that their horse simply ‘isn’t himself’, although there are no clinical signs present.

However, common signs of EGUS to watch out for include:

  • weight loss and poor appetite
  • loss of condition and dull coat
  • mild, recurrent colic
  • stretching to urinate
  • reduced or uncharacteristically poor ridden performance
  • behavioral changes
  • discomfort on having the girth tightened
  • extra sensitivity during grooming

In order to diagnose EGUS, your vet will carry out an endoscopy.

For this, your horse will be mildly sedated, and a video gastroscope will be passed down his esophagus and into his stomach, where sites of concern can then be photographed.

How are gastric ulcers treated?

The treatment your horse will undergo will depend on the severity and type of his ulcers.

Drug therapy to restrict the production of gastric acid is usually given, together with tablets that help to form a protective barrier across any existing ulcers.

This therapy will make the horse more comfortable while the ulcers heal.

If your vet is concerned that infection may set in because of the severity of the ulcers, he may also prescribe a course of antibiotics.

Preventative measures

Correct, ongoing management of the horse is vital if a recurrence of the ulcers is to be prevented.

You can start by ensuring that your horse receives good-quality hay or haylage ad-lib throughout the day and night or has access to good grazing, which can also help to reduce stress.

Adding alfalfa to the horse’s ration can also help, as it has an antacid effect.  Similarly, corn and rapeseed oils can help to reduce acid production and assist in healing existing ulcers.

Troublesome ulcers can heal within six months if the horse is managed correctly.

If the horse is stabled for much of the time, several small feeds during the day are better than one or two large ones and should be accompanied by ad-lib forage and plenty of fresh water.

Horses that become stressed when traveling may benefit from a calming supplement.

In conclusion

Gastric ulcers can be extremely debilitating for your horse if they are not detected and treated appropriately.

You can help to keep your horse’s digestive system in good order through correct feeding and management as outlined above.

If you are concerned that your horse’s lifestyle may predispose him to EGUS, ask your vet for more advice.

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  1. Hi, my name is Teresa and i live in Adelaide South Australia.
    My horse suffers from Ulcers and this is managed by my vet and myself.
    My question – In your Ulcer Article you mention
    “Tablets” as part of the treatment. Just wondering if you tell me what these tablets are called, o that i cam google the product.
    I currentlly use a product called Ulcershield which is a tube paste given on an empty stomach 30 minutes before feeding.
    BTW I have 2 of your Books How to & Exercises.
    At last a How To Dressage Written in readable and clear terms without all the complicated jargon.
    Thankyou

    I look forward to your response.
    Kind Regards
    Teresa Watling

    1. Hello Teresa,
      Firstly, thank you very much for buying our books. Your support is much appreciated and helps us to keep this website running 🙂

      There are a few tablets available to help treat/prevent equine ulcers, however, most treatments tend to come in paste/powder form since they can be easier to administer. We don’t want to mention any specific brand/type as we don’t to be seen as recommending them on this website, nor do we want to be seen as giving medication advice as we are not qualified to do so. But if you are interested in a tablet form of treatment, I recommend speaking to your vet who will be best suited to advise.
      I am sorry that we couldn’t be of anymore help.
      HTD x

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