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Gastric Ulcers in Horses

Ulcers in horses

26 February 2024

The more we look, the more we find gastric ulcers in horses. They are being increasingly diagnosed across all horse populations (including leisure horses) likely due to greater awareness of the signs and symptoms. There have also been developments in technology allowing vets to make earlier and more conclusive diagnoses. Overall, more horses now seem to have ulcers than don’t. 

Ulcers are painful for the horse, can impact on their handlers or riders as they react to that pain, and may even reflect our failing to provide a calm and healthy environment. That's not to say all owners of horses with ulcers are to blame - but it really ought to trigger all of us to think more about how we can better care for our horse's needs. Ulcers should not be inevitable or acceptable.

Horses are sociable grazers, gradually moving around their range in groups, grazing and walking at the same time. If we isolate them from their own kind, restrict their range or limit their ability to eat for 16 hours a day, various levels of stress are created. Add inappropriate food and we can only wonder that ulcers are not even more prevalent. The right food can make a huge difference, but environmental factors will also have a significant impact on a successful outcome.

Acid is pretty much constantly generated in the horse's stomach. It will build up to potentially damaging levels when the horse is not eating enough food to “mop it up”. Some food will actually increase the amount of acid in the stomach. Starch and sugar can be turned to acid by the action of certain microbes. Stress, environmental or due to pain, for instance, leads to extra acid being produced and will also damage the mucus secretions that protect the lower part of the stomach. Some or all of these will make a horse increasingly prone to developing ulcers. Work, especially cantering, galloping and jumping, will cause the abdominal contents to put pressure on the stomach, forcing acid on to the sensitive upper part of the organ.  Ulcers ensue.

There are plenty of things we can do to help combat ulcers:

  • Allow horses as much time at grass as possible, with the company they need.
  • Avoid starchy or sweetened food, sticking with the best quality forages. 
  • Do not withhold feed, especially when they are worked - target feeding is good practise so long as it is with forage not cereal based feeds.   
  • Maintain a calm atmosphere and sympathetic training. 

The best food for horses with ulcers is lucerne (aka alfalfa). This amazing forage, known in different languages as 'Prince of Feeds' and 'Best of the Best', has been grown for horses for around 5,000 years so has stood the test of time. It works really well for horses with ulcers for many reasons:

  • It has better levels of calcium than any other forage, which helps against acid. 
  • Its proteins, which continue into the hind gut, effectively help buffer acid throughout the gut. 
  • Its natural gums help soothe the gut lining.
  • Lucerne grown specifically for horses in the UK and Europe, is naturally low in sugar and starch. 
  • Its fibre supports gut microbes as it is easily fermented by them.
  • Soaked lucerne pellets, like Lucie Nuts and Organic Lucie Pellets, are soft and easily digested.
  • Lucerne chop / chaff such as Build & Shine encourages chewing and additional saliva generation. Saliva actively neutralises acid, so anything to increase chewing is beneficial, provided the horse has good dentition.

Ulcers are not an inevitable result of domesticating horses but rather an unintended consequence which can be remedied with a little more attention to the horse’s actual needs as a horse.

To view our most recommended feeds for ulcers and further management tips please click here.

For a free Feed Plan tailored to your horse's individual needs please complete our online form or call the Feed Line on 01728 604 008. Our friendly team will be happy to help.

Featured Products

A nutrient rich, premium lucerne chop with fresh cold pressed linseed oil.


A tonic feed based on wild flower meadow forages & horseradish to support the immune system.


Cooked full fat linseed, ready to feed. A valuable source of essential Omega 3.


Premium lucerne compressed into 1kg blocks, feed whole & dry to mimic grazing.


Premium lucerne chop, naturally high in calcium & protein to support muscles & bones.


Our highest fibre, low sugar lucerne in 6mm cubes, perfect for those needing a low calorie feed.


Premium 12mm lucerne nuts, naturally high in calcium & protein to support muscles & bones.


Premium 6mm organic lucerne pellets, naturally high in calcium & protein to support muscles & bones.


Sieved lucerne chop ideal for all equines, especially those looking to lose weight.


A carefully formulated forage balancer containing high quality functional ingredients for promoting optimum health.


A blend of top quality ingredients for our ultimate forage balancer. Feed all year round to complement forages & grazing.


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