EMM in horses refers to “Equine Metabolic Myopathy” (sometimes called Equine Myofibrillar Myopathy depending on context).
It’s a muscle disorder seen most commonly in Arabians and Arabian-cross horses, though it can occur in other breeds. It has also been gaining numbers in Quarter Horses. Here’s a breakdown:
Equine Myofibrillar Myopathy (EMM)
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A muscle disease where horses have trouble producing and storing energy in their muscle fibers.
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Affected horses often have exercise intolerance — they tire easily, have poor performance, or develop muscle soreness after light work.
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Some horses show signs of stiffness, reluctance to move forward, or back soreness rather than tying-up episodes.
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Diagnosis is typically confirmed with a muscle biopsy.
Management
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Diet plays a huge role:
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Low starch, high fat, high quality protein (especially lysine, threonine, and vitamin E).
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Adding oils or rice bran as a fat source for energy.
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Regular but low-intensity exercise helps maintain muscle function.
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Supplements supporting muscle health and mitochondria
How can BCAA 3:1:2, N-Acetyl and L-Carnitine help EMM?
Both BCAAs and N-Acetyl L-Carnitine can play a role in managing Equine Myofibrillar Myopathy (EMM) because the disorder involves impaired muscle energy metabolism and protein turnover. Here’s how they can help:
BCAA 3:1:2 (Leucine:Isoleucine:Valine)
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Leucine (3 parts) → Stimulates muscle protein synthesis via mTOR activation, which may support repair of damaged muscle fibers in EMM horses.
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Isoleucine & Valine (1 and 2 parts) → Provide alternative energy substrates during exercise, sparing glycogen use, which is beneficial since EMM horses often have impaired carbohydrate metabolism.
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Overall benefit: May reduce muscle breakdown, support recovery after exercise, and help maintain muscle mass in horses with chronic muscle weakness.
N-Acetyl L-Carnitine (ALCAR)
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A more bioavailable form of L-Carnitine, which is crucial for transporting fatty acids into mitochondria for energy.
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In EMM horses, mitochondrial energy pathways are disrupted → ALCAR may help improve fat metabolism and ATP production in muscle cells.
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Has antioxidant and neuroprotective effects, which can reduce oxidative stress that contributes to muscle damage.
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May also improve exercise tolerance and reduce post-exercise soreness.
Why These Make Sense for EMM
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EMM horses don’t efficiently use stored glycogen → giving them tools to burn fats and amino acids for energy can reduce exercise intolerance.
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Supporting muscle repair + mitochondrial function may lessen the chronic weakness and soreness these horses experience.
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They would typically be used alongside a low-starch, high-fat, high-protein diet with added vitamin E.
MuscleHealth can help!
- Basic Animal Health has designed a supplement for Muscle Health that includes all of these key ingredients.
- Designed to help horses keep their muscles hydrated and strong, while allowing them to stay flexible, MuscleHealth incorporates ingredients to help maintain muscle health and is blended with ingredients to ensure it is absorbed properly into the horse’s system, not just passed through.
- Take a look at what MuscleHealth has to offer here: https://basicanimalhealth.com/products/musclehealth-gel-supplement-for-horses-bottles?_pos=1&_sid=814c4817b&_ss=r