EMS - Metabolic Disease in Horses
Equine Metabolic Syndrome (EMS) is a serious metabolic disorder that primarily affects overweight horses. This disease not only impacts overall health but can also lead to painful conditions such as laminitis. In this article, you will learn about the causes of EMS, the symptoms that can appear, and how you can effectively support your horse. Early detection and action are crucial to maintaining your horse's quality of life.

What is EMS in Horses?
Definition and Causes
Equine Metabolic Syndrome (EMS) is a hormonal metabolic disorder that primarily affects overweight horses. The main triggers are improper feeding and lack of exercise, which lead to insulin resistance. This can be observed particularly in hardy breeds and pony breeds such as Icelandics or Shetland ponies, as these breeds are originally accustomed to less energy-rich diets.
How EMS Affects the Horse's Body
EMS has serious effects on your horse's metabolism. Excessive fat deposits produce hormone-sensitive substances that reduce the insulin sensitivity of tissues and lead to persistently elevated blood sugar and insulin production. This condition can not only endanger hoof health but also contribute to severe diseases such as laminitis, which can cause extreme pain and limitations.
In addition to the health risks associated with EMS, decreased performance and dull coat can also occur, significantly impairing your horse's quality of life. Due to insulin resistance, blood sugar levels remain consistently high, which can trigger a vicious cycle of further health problems. Therefore, it is crucial to act immediately if EMS is suspected and to have the horse examined by a veterinarian.
Symptoms of EMS in Horses
Visible Signs
In a horse suffering from EMS, the visible signs are often clear. The animal is frequently significantly overweight and shows pronounced fat deposits around the eyes, mane, shoulders, and rump. A dull coat can also be a sign that your horse is suffering from this metabolic disorder.
Behavioral Changes
In horses with EMS, you may observe various behavioral changes. These include a noticeable decrease in performance and increased sweating, even with minimal exertion. These symptoms indicate that your horse is struggling to provide the necessary energy.
Furthermore, there may be an unusually increased fluid requirement, which can contribute to the acidification of the body. Fertility disorders in mares are also possible. You should take these changes seriously, as they can indicate serious health problems.
Health Complications
The health complications of EMS should not be underestimated. One of the most serious is the risk of laminitis, which can result from disrupted glucose metabolism. This disease can cause acute and chronic pain and significantly impair your horse's quality of life.
Additionally, long-term consequences such as poorly healing wounds and skin problems can occur due to EMS, as the weakened immune system is more susceptible to infections. It is crucial to recognize these symptoms early and take appropriate measures to ensure your horse's well-being.
Diagnosis of EMS in Horses
To diagnose Equine Metabolic Syndrome (EMS), various tests are required to accurately determine your horse's health status. These tests help to determine insulin and glucose levels, which are crucial for diagnosis. Your veterinarian will use these procedures to determine if your horse has EMS and what treatment is necessary.
Blood Tests
Blood tests play a central role in the diagnosis of EMS. Your veterinarian will take blood samples to analyze insulin and glucose levels. High values can indicate insulin resistance, which is characteristic of EMS.
Glucose Tolerance Test
In the glucose tolerance test, a blood sample is taken, followed by a glucose infusion. Subsequently, further samples are taken at regular intervals to observe the glucose breakdown time.
This test is particularly informative as it helps you understand how your horse reacts to sugar intake. A delayed glucose breakdown can indicate impaired insulin sensitivity, which is crucial for the diagnosis of EMS.
Insulin Sensitivity Test
The insulin sensitivity test is performed after your horse has received a glucose infusion. Subsequently, an insulin injection is administered, and blood samples are regularly taken to monitor insulin levels.
This test is important to determine how well your horse's cells respond to insulin. A low response can indicate insulin resistance, which is a typical feature of EMS. The results provide important information for planning targeted treatment and improving your horse's well-being.

Treatment and Therapy for EMS in Horses
Weight Management
Effective weight management is crucial for the treatment of EMS. If your horse is overweight, you should work with a veterinarian to create a long-term weight reduction plan. Slow and controlled weight loss protects your horse from serious health risks such as hyperlipidemia.
Dietary Changes
Adjusting the diet is a central part of EMS treatment. All horses affected by EMS should be switched to an energy-reduced, starch- and sugar-poor diet to regulate insulin levels and reduce overweight.
It is important to gradually reduce the amount of feed, while ensuring a high supply of roughage. Avoid high-concentrate feeds and make sure your horse does not consume excessive amounts of readily available carbohydrates during feeding. Targeted dietary changes promote insulin sensitivity and contribute to sustainable weight reduction.
Supplementary Feed for EMS Horses
Horses with Equine Metabolic Syndrome (EMS) often suffer from deficiencies and metabolic problems due to an unbalanced diet, high performance demands, and environmental stressors. The Metabolism Booster for Horses, developed by Sandra Fencl in collaboration with the Katharinen Pharmacy in Unterhaching, offers an optimal solution.
This supplementary feed provides your horse with essential vitamins, minerals, and trace elements that are often lacking in daily nutrition. Numerous customers report increased vitality and improved performance in their horses. The Metabolism Booster helps stabilize metabolism and significantly improves the well-being of horses with EMS.
Movement and Activity
Regular exercise is very important for your horse's health. If your horse has EMS, you should encourage it to move to reduce hormonally active fat tissue and improve insulin sensitivity.
Plan varied exercise programs daily that your horse enjoys. Even with limited performance, providing a large turnout with various movement incentives can help. It is essential that your horse has sufficient opportunity to regulate its energy needs naturally and thus support the success of the therapy.
Consequences of Untreated EMS
Health Risks
Untreated EMS can lead to serious health risks, including an increased likelihood of laminitis, which can cause acute or chronic pain. Persistently elevated blood sugar levels not only damage organs but also promote other diseases that permanently impair your horse's general condition.
Reduced Quality of Life
Your horse's quality of life suffers significantly from untreated EMS. Decreased performance and pain from laminitis or other accompanying diseases severely restrict your horse's mobility. A horse that was once active and playful could become a lethargic animal that can no longer participate in stable life. This often leads to psychological stress and can negatively affect the bond between you and your horse.
Prevention and Management of EMS
Tips for Horse Owners
If you own a horse prone to obesity, you can actively contribute to the prevention of EMS. Ensure that the feed is energy-reduced and low in starch and sugar. Daily, appropriate exercise is crucial to promote insulin-sensitive tissue. Also, keep an eye on weight control and integrate regular vet visits to detect changes early.
Importance of Regular Veterinary Visits
Regular veterinary visits are crucial for your horse's health, especially if your animal tends to be overweight. Early detection of EMS or other metabolic disorders can prevent serious consequences. A veterinarian can check insulin and glucose levels through targeted blood tests and give you recommendations on feeding and exercise management. This way, your horse not only stays healthy but also performs well.

In addition, it is important to consider regular check-ups as part of prevention. By monitoring your horse's health status, potential problems such as laminitis or fat storage disease can be detected early. A veterinarian can also give you individual recommendations for nutrition and exercise to ensure that your horse remains in optimal physical condition. This way, you protect not only the health but also the quality of life of your animal.
Conclusion
Equine Metabolic Syndrome is a serious metabolic disorder that primarily affects overweight horses. You should closely monitor symptoms such as obesity, fat pads, and decreased performance. Early diagnosis and an adapted diet are crucial to help your horse. Also, support exercise to improve insulin sensitivity. Be sure to consult a veterinarian to take the best measures for your horse's health and to avoid risks such as laminitis.
These questions about EMS in horses are frequently asked:
1. How do you recognize EMS in horses?
Equine Metabolic Syndrome (EMS) is often recognized by obesity, especially fat pads in unusual places such as the crest of the mane, above the eyes, and around the tail root. Other signs include recurrent laminitis and insulin resistance, which can be confirmed by blood tests. An affected horse often struggles to lose weight, even with reduced feed intake and increased exercise.
2. What helps with EMS in horses?
For an EMS horse, a strict diet with low sugar and low starch content helps. Regular exercise is crucial to improve metabolism and reduce weight. Veterinary care and regular monitoring of blood values are also important to keep the disease under control and prevent complications.
3. What should EMS horses not eat?
EMS horses should avoid high-sugar and high-starch foods, such as grains, sweets, and fruits. Instead, they should primarily receive good quality hay, ideally tested for its sugar content. Grass should be limited, especially in spring and autumn when it can have a high sugar content.
4. Can EMS be cured?
EMS cannot be fully cured, but it can be effectively managed. With an appropriate diet, regular exercise, and veterinary monitoring, symptoms can be controlled, and the risk of laminitis minimized. The goal of treatment is to reduce weight and improve insulin sensitivity.
5. Can horses recover from EMS?
Horses can recover well from the effects of EMS if treated appropriately. Through consistent diet and exercise programs, many horses can lead a normal life again. However, regular monitoring and adjustment of treatment by a veterinarian are crucial to prevent relapses.
6. Are EMS and Cushing's the same?
EMS and Cushing's syndrome (PPID) are not the same, although they can share similar symptoms such as laminitis and insulin resistance. EMS is primarily a metabolic disorder related to obesity and insulin resistance. Cushing's syndrome, on the other hand, is a hormonal disorder caused by an overactive pituitary gland.
7. Which oil for EMS horses?
Linseed oil is particularly suitable for EMS horses, as it has a low sugar content and is a good source of omega-3 fatty acids. These fatty acids can have anti-inflammatory effects and improve overall health. However, it should be fed in moderation to avoid excessive calorie intake.
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