Your Horse Just Got Diagnosed With Laminitis, Now What Goes in the Feed Bucket?
If you’re reading this at 11pm after your vet just said the word “laminitis,” you’re probably scared, overwhelmed, and staring at a feed room full of products you’re suddenly not sure are safe anymore.
That panic is normal. Laminitis is one of the leading causes of chronic lameness and early euthanasia in horses, and knowing what to feed a horse with laminitis is the single biggest lever you control in preventing the next episode.
This guide breaks down exactly what to feed, what to avoid, and the actual carbohydrate math your vet or equine nutritionist is using behind the scenes, so you’re not just following vague advice like “cut back on sugar.”
First, Understand What’s Actually Happening Inside the Hoof
Laminitis is inflammation of the laminae, the tissue structures that connect the coffin bone to the hoof wall. When this tissue weakens or fails, the coffin bone can rotate or sink, which is what vets call founder in severe cases.
There are three broad triggers:
- Endocrinopathic laminitis: Caused by high insulin levels, usually linked to Equine Metabolic Syndrome (EMS) or Pituitary Pars Intermedia Dysfunction (PPID, also called Cushing’s disease). This accounts for the vast majority of cases seen in practice today.
- Sepsis-related laminitis: Triggered by systemic illness, retained placenta, or severe infection.
- Mechanical laminitis: Caused by excessive concussion or weight-bearing on one limb, often from an injury on the opposite leg.
This guide focuses primarily on endocrinopathic laminitis, since diet is the direct, controllable driver in the vast majority of at-risk and recovering horses.
The Core Principle: It’s All About NSC
Almost every feeding decision for a laminitic horse comes down to one number: Non-Structural Carbohydrates (NSC).
NSC = Water-Soluble Carbohydrates (sugar) + Starch
High NSC intake spikes blood insulin. In a horse with insulin dysregulation, that insulin spike is directly linked to laminae damage. This is why cutting NSC isn’t a vague “less sugar is healthier” suggestion, it’s the actual mechanism you’re managing.
The NSC Targets You Need to Know
Research-backed thresholds used by equine nutritionists and referenced at recent AAEP (American Association of Equine Practitioners) conventions:
| Risk Level | Maximum NSC (dry matter basis) |
|---|---|
| High-risk or actively laminitic horses | Below 10% |
| Moderate-risk horses (history of EMS/PPID, overweight) | 10-12% |
| General “safe” industry guideline | Below 12%, roughly 1g NSC per kg bodyweight per meal |
| Horses with confirmed insulin dysregulation | As low as 0.1g NSC per kg bodyweight per meal, roughly 10 times stricter than the general guideline |
That last figure comes from newer research presented at the 2025 AAEP Convention, which found that older “safe” thresholds were established using metabolically normal horses, not horses with actual insulin dysregulation. If your horse has confirmed insulin resistance, the old 10-12% rule may not be strict enough.
Quick Math Example
For a 500kg (1,100lb) horse with confirmed insulin dysregulation, that 0.1g/kg/meal threshold means roughly 50 grams of NSC per meal, not per day. That’s an extremely tight margin, which is exactly why grain-based feeds are almost always eliminated entirely for these horses.
Step 1: Get Your Hay Tested (Don’t Skip This)
This is the step almost every generic article skips, and it’s the most important one.
You cannot visually judge hay NSC content. A green, leafy, “healthy looking” hay can carry more sugar than a coarse, stemmy one.
How to test hay:
- Pull core samples from multiple bales using a hay probe (many feed stores or extension offices will lend these).
- Send samples to an equine forage lab such as Equi-Analytical Laboratories.
- Ask specifically for ESC (ethanol-soluble carbohydrates) + Starch values, since this combination is what most vets use as the practical NSC marker, not total WSC.
- Look for a combined ESC + Starch value under 10%.
Safer Hay Types (Generally Lower NSC)
- Timothy hay
- Teff hay
- Rhodes grass hay
- Late-maturity, stemmy grass hays (higher fiber, lower sugar concentration)
Hays to Avoid or Use With Extreme Caution
- Ryegrass hay
- Oaten (oat) hay
- Wheaten hay
- Barley hay
- Any hay cut in the afternoon after a sunny day (grasses store more sugar by late afternoon than in early morning)
Step 2: Soak the Hay If You’re Unsure
If lab testing isn’t immediately possible, or your tested hay comes back borderline, soaking hay is a proven way to pull soluble sugars out.
Soaking protocol:
- Submerge hay fully in water for 60 minutes in warm water, or up to 12-16 hours in cold water
- Discard the soak water afterward; it now contains the leached sugars
- Feed the soaked hay promptly, since soaked hay can begin fermenting within a few hours in warm weather
Soaking typically reduces WSC by 30 to 50%, though results vary by hay type and water temperature. It is not a substitute for testing, but it’s a solid backup strategy.
Step 3: Cut Out High-Risk Feeds Completely
These need to be removed from a laminitic horse’s diet, no exceptions during an active episode:
- Cereal grains: oats, corn, barley, wheat
- Molasses-containing feeds: sweet feeds, treats with molasses coating
- Commercial “performance” or “growth” feeds: these are formulated for energy density, which means high NSC by design
- Lush spring or fall pasture grass: this is often the single biggest hidden NSC source owners underestimate
Why Pasture Is More Dangerous Than Most Owners Realize
Fresh pasture NSC can spike above 40% of dry matter during rapid growth periods, especially after rainfall following a dry spell, or on cold sunny mornings when photosynthesis outpaces the plant’s overnight sugar use.
Safer grazing windows (if any grazing is permitted by your vet):
- Very early morning, generally before 10am, since overnight respiration burns off stored sugars
- Avoid grazing in late afternoon and evening entirely, when sugar accumulation peaks
- Limit total turnout to 1-3 hours during recovery, using a grazing muzzle if longer turnout is medically necessary
For horses with a history of repeated laminitis episodes, many vets recommend permanent dry lot housing rather than pasture access altogether, even during “safe” windows.
Step 4: Build the Actual Diet
The Foundation: Low-NSC Forage
Forage should make up at least 1.5 to 2% of the horse’s ideal bodyweight per day in dry matter, fed as low-NSC hay, soaked if needed.
For a 500kg horse, that’s roughly 7.5 to 10kg (16.5 to 22lbs) of hay daily, split across multiple small meals rather than one or two large feedings. Frequent small meals help keep insulin responses more stable than large infrequent ones.
Filling Nutritional Gaps Without Adding NSC
Cutting grain doesn’t mean cutting nutrition. Laminitic horses still need proper vitamins, minerals, and protein, just from low-NSC sources.
- Ration balancers: Low-calorie, low-NSC pelleted feeds designed specifically to fill vitamin and mineral gaps without adding sugar or starch load. Many are formulated at under 15% NSC, but always check the label and cross-reference with your vet.
- Beet pulp (unmolassed): A safe, low-NSC fiber source that adds calories for underweight horses without the sugar spike of grain. Always rinse and soak before feeding.
- Chromium and magnesium supplementation: Some research suggests these minerals may support insulin sensitivity, though evidence is still developing; discuss with your vet before adding.
- Biotin and methionine: Support hoof horn quality during the regrowth phase after a laminitic episode, generally recommended for a minimum of 6 to 9 months since that’s roughly how long it takes for new hoof wall to grow from coronary band to ground.
Body Condition Matters Just as Much as NSC
Obesity is one of the strongest risk factors for endocrinopathic laminitis. Use the Henneke Body Condition Scoring system (1-9 scale) to track your horse objectively rather than guessing by eye.
Target range for most laminitic-prone horses: 4 to 5 out of 9. Anything at 7 or above significantly raises insulin dysregulation risk and should be addressed through calorie restriction, not just NSC restriction.
Sample Daily Feeding Framework (For a 500kg / 1,100lb Horse in Recovery)
This is a general framework, not a prescription. Always confirm exact amounts with your vet or an equine nutritionist based on bloodwork and body condition.
- Morning: 2.5kg soaked, low-NSC hay
- Midday: 2.5kg soaked, low-NSC hay
- Afternoon: Ration balancer portion per label instructions (typically 100-200g for this bodyweight)
- Evening: 2.5kg soaked, low-NSC hay
- Late night: 2.5kg soaked, low-NSC hay
Total daily hay: roughly 10kg, split into four or more feedings to mimic natural grazing patterns and reduce insulin spikes from large single meals.
Safety and Practical Management Tips
- Never make sudden diet changes. Transition to a new hay type over 7 to 10 days to avoid digestive upset, even when the new hay is “safer.”
- Weigh hay, don’t eyeball it. A “flake” can vary from 1kg to 3kg depending on how the bale was baled. Use a luggage scale on the hay net.
- Track weight and body condition monthly using a weight tape and Henneke scoring, not just visual impression.
- Keep a laminitis episode log, noting diet, weather, pasture access, and any lameness signs. Patterns often emerge that pure memory misses.
- Work with your vet on bloodwork, specifically resting insulin and ACTH levels, to confirm whether EMS, PPID, or both are driving the condition, since PPID cases often need medication (like pergolide) alongside diet changes.
- Don’t rely on treats “just this once.” Commercial horse treats and even some carrots and apples carry meaningful sugar load; ask your vet about safe treat alternatives like small amounts of low-NSC hay pellets.
Wrapping It Up
Feeding a laminitic horse isn’t about eliminating joy from their diet, it’s about understanding the exact carbohydrate math that protects their hooves. Get your hay tested, keep NSC under 10-12% (or stricter if insulin dysregulation is confirmed), cut grain and lush pasture, and track body condition consistently.
Do this well and most horses with diet-driven laminitis go on to live sound, comfortable lives for years afterward. The diagnosis feels like an emergency tonight, but with the right feeding plan, it becomes manageable routine within a few weeks.
Also Read: Basic Horse Riding Tips for Adults: 15 Essential Lessons
Frequently Asked Questions
1. What NSC percentage is safe for a horse with laminitis?
Most vets and nutritionists recommend keeping total dietary NSC below 10% for actively laminitic or high-risk horses, and below 12% as a general safety ceiling for moderate-risk horses. Horses with confirmed insulin dysregulation may need a far stricter limit, as low as 0.1 grams of NSC per kilogram of bodyweight per meal, based on research presented at recent equine veterinary conventions.
2. Can a horse with laminitis eat grass at all?
It depends on severity and your vet’s assessment. Some horses can graze safely during early morning hours (generally before 10am) when pasture sugar levels are lowest, often using a grazing muzzle to limit intake. Horses with repeated laminitis episodes are frequently kept on dry lots permanently rather than risking pasture access.
3. Is soaking hay actually effective for reducing sugar content?
Yes, soaking hay in water for 60 minutes (warm water) or up to 12-16 hours (cold water) typically reduces water-soluble carbohydrates by 30 to 50 percent. It’s a useful backup strategy when lab testing isn’t immediately available, though testing hay directly gives far more precise results.
4. What can I feed a laminitic horse instead of grain?
Low-NSC ration balancers, unmolassed soaked beet pulp, and low-NSC grass hays are the standard replacements. These provide necessary calories, vitamins, and minerals without the sugar and starch spike that cereal grains and sweet feeds cause.
5. How long does it take for a horse to recover from laminitis with proper diet management?
Initial inflammation often improves within days to weeks with strict dietary changes and vet-directed treatment, but full hoof wall regrowth from coronary band to ground typically takes 6 to 9 months. Long-term soundness depends heavily on managing the underlying cause, whether that’s EMS, PPID, or both, alongside consistent diet control.
References
- Kentucky Equine Research. Feeding Forage and Limiting Nonstructural Carbohydrates in Metabolic Horses (citing findings presented at the 2025 American Association of Equine Practitioners Convention).
- University of Tennessee Institute of Agriculture Extension. Nutritional Management for Avoiding Equine Laminitis.
- Kaplan, R. and colleagues (PubMed/National Library of Medicine). Pasture Nonstructural Carbohydrates and Equine Laminitis.
- National Center for Biotechnology Information (PMC). Evaluating Digestibility and Toxicity of Native Warm-Season Grasses for Equines.
- Poulin Grain (in consultation with equine veterinary sources). Pasture Turn Out Strategies to Limit NSC Intake.
- Virbac Animal Health. Feeding Horses With Laminitis.
- Equi-Analytical Laboratories. Forage and feed NSC testing services (referenced industry standard for ESC + Starch analysis).
Disclaimer
This article is intended for general educational purposes only and is not a substitute for professional veterinary care. Laminitis is a serious, potentially career-ending or life-threatening condition, and every horse’s dietary needs depend on individual bloodwork, body condition, breed, workload, and underlying cause (EMS, PPID, sepsis, or mechanical).
Always consult a licensed veterinarian or a qualified equine nutritionist before changing your horse’s diet, especially during an active laminitic episode. The NSC figures, feeding amounts, and sample framework in this article are general industry guidelines drawn from published research and veterinary sources, not a prescription for your specific horse.