Strong out of the gate. Settled at the half. Three-quarters in, something's gone — the gear isn't there, the kick won't come. Late-race fade is rarely random. It's almost always one of a short list: bleeders, the palate, undiagnosed ulcers, sub-clinical tying-up, electrolyte loss, or a sub-clinical mineral gap. Run the right workup. Find the actual driver.
A horse who fades late is telling you which system is failing. The pattern of where in the race or workout the fade appears narrows the cause dramatically. Use this as your first diagnostic clue.
Note this exact pattern. When you call your vet, lead with: "Where in the race the fade happens is..."
The cause list for "won't finish" is finite. Working through it in the right order — vet exam first, bloodwork second, mineral support third — saves months of guessing and meet days you'll never get back.
Upper airway scope (DDSP), post-exercise scope (EIPH), stomach scope (ulcers), cardiac auscultation, lameness exam.
CBC for anemia, post-exercise muscle enzymes (CK/AST) for sub-clinical tying-up, electrolyte panel during/after work.
If breed-appropriate — GYS1 for PSSM1, MFM/PSSM2 panel for warmbloods/Arabians, RER assessment for hot fillies.
Hair analysis: selenium, magnesium, iron, electrolytes, heavy-metal panel. Optimizes the support around diagnosed issues.
Exercise-induced pulmonary hemorrhage. Classic stretch fade. Common in racing. Diagnosis via post-exercise scope. Lasix where rules permit.
Soft palate displaces during peak work. Gurgling sound. Sudden loss of speed. Diagnosis via dynamic endoscopy. Surgical and conservative options exist.
Up to 90% prevalence in racehorses. Drains energy, decreases appetite, affects performance. Endoscopy required for diagnosis →
PSSM1/MFM/RER mild forms produce stiffness and fade without classic acute episodes. Genetic testing identifies. Tying-up workup →
Atrial fibrillation, murmurs, arrhythmias can cause fade. Diagnosis via vet auscultation, ECG, echocardiogram.
Pain reduces willingness to extend. Hidden lameness exam (often requires nerve blocks) belongs in any chronic fader workup.
Low red blood cell count or hemoglobin. CBC identifies. Iron, copper (cofactor for iron use), B12 status all relevant.
Antioxidant defense for working muscle. Pairs with vitamin E. Hair analysis identifies selenium status; vit E requires bloodwork.
Sodium, potassium, chloride, magnesium lost in sweat. Hair analysis shows long-term status; race-day replacement is separate.
$49.99 kit. ICP-MS analysis. Selenium, magnesium, iron, electrolytes, full heavy-metal panel.
Hair mineral analysis is one supportive input in a "won't finish" workup. It cannot diagnose airway, cardiac, GI, or muscle disease. What it can do is identify mineral status that supports muscle function, recovery, and oxygen carrying — useful inputs alongside the vet workup.
| Tier | What It Measures | Why It Matters For Performance |
|---|---|---|
| Essential Minerals | Selenium, Magnesium, Iron, Sodium, Potassium, Chloride, Calcium, Phosphorus, Sulfur, Copper, Zinc, Manganese, Cobalt, Chromium, Boron, Molybdenum | Selenium for muscle antioxidant defense. Mg for ATP production. Iron+Cu for oxygen carrying. Na/K/Cl/Mg for electrolyte status. |
| Mineral Ratios | Sodium/Potassium, Calcium/Magnesium, Iron/Copper, Sodium/Magnesium, Calcium/Phosphorus, Zinc/Copper, Calcium/Potassium | The Na/K and Ca/Mg ratios are the performance ratios — reveal whether sweating losses or absorption blocks are limiting capacity. |
| Toxic Heavy Metals | Lead, Mercury, Arsenic, Cadmium, Aluminum, Antimony, Beryllium, Uranium | Cadmium specifically affects musculoskeletal function. Chronic heavy metal exposure compounds oxidative stress and impairs recovery. |
Four steps. About a week of total elapsed time. Run in parallel with — never in place of — vet workup of airway, GI, cardiac, and musculoskeletal systems.
Order the $49.99 hair & mineral analysis kit from Mane Metrics. Resealable bag, pre-labeled return envelope, plain instructions.
2 business days to arriveSnip about 1.5 inches of mane hair close to the crest. Total time at the barn: under 5 minutes. Drop the sealed envelope in any mailbox.
~5 minutesPartner laboratory runs ICP-MS analysis across 42+ elements — including the full electrolyte panel, selenium, iron, and the heavy-metal panel.
5–7 days at the labEmail-delivered report with color-coded findings, plus a follow-up phone consultation focused on the performance-mineral picture and what to bring to your vet.
Email + voice debriefList "doesn't finish," "late-race fade," or "performance fading" as your main concern at checkout. The lab interpretation focuses on the performance-mineral panel when they know that's the investigation. Bring race/workout pattern, breed, age, current training load, and any vet workup findings to the follow-up consultation.
The mineral test is one of three things you should be doing simultaneously — vet airway scope, bloodwork during/after work, mineral panel — all run in parallel.
| When | What's happening | What you do |
|---|---|---|
| Day 0 | Decide on a real workup | Schedule vet visit — scope airways, scope stomach, listen to heart, lameness exam. Order mineral kit. Note the fade pattern (where in race). |
| Day 1–2 | Mineral kit ships | Document recent races/workouts, fade timing, signs (gurgling, blood, soreness). |
| Day 2–3 | Collect mane sample | ~1.5 inches of mane near the crest. Seal and mail. |
| Within 1–2 weeks | Vet workup — airway, GI, cardiac, lameness | Often diagnostic answer same visit. EIPH, DDSP, ulcers, cardiac issues identifiable with appropriate scopes/exam. |
| Day 9–12 | Mineral panel results delivered | Read the report. Schedule the voice debrief. |
| Day 14+ | Targeted treatment + nutrition | Treat the diagnosed condition. Adjust mineral support based on findings. Consider race-day electrolyte plan. |
| Week 4+ | Re-evaluate at next race | Did the fade pattern change? If yes, you found it. If no, push deeper on the workup. |
The honest truth from the racing world: the trainers who get fading horses turned around are the ones who do the structured workup. The trainers who keep losing meets are usually the ones still cycling through their fifth or sixth supplement protocol without ever scoping for EIPH or scoping for ulcers.
Order the kit now. We'll handle the rest. Questions? Call (972) 284-1878.
The major causes of equine exercise intolerance are well documented. Each has established diagnostic and management literature. Here are the references worth reading.
The questions trainers and owners ask most often when the horse who used to finish doesn't anymore.
Late-race or late-workout fade is rarely random. The most common drivers in performance horses are: exercise-induced pulmonary hemorrhage (EIPH or "bleeding"), dorsal displacement of the soft palate (DDSP — "flipping the palate"), undiagnosed gastric ulcers, sub-clinical tying-up (PSSM/MFM/RER), electrolyte loss from sweating, anemia or oxygen-carrying issues, conditioning gaps, hidden lameness, and mineral imbalances affecting muscle function and recovery. Each is investigated differently — the vet workup matters more than the next supplement bottle.
Exercise-induced pulmonary hemorrhage (EIPH) is bleeding from the small blood vessels in the lungs during intense exercise. Common in racehorses (Standardbred, Thoroughbred, racing Quarter Horse) and other high-intensity performance horses. Severity ranges from microscopic blood in the airways to visible epistaxis (blood from the nose). EIPH causes late-race fade because the lung tissue can't oxygenate effectively. Diagnosis requires post-exercise endoscopy of the airways. Furosemide (Lasix) is the standard medication where rules permit.
Dorsal displacement of the soft palate (DDSP, often called "flipping the palate") is an upper-airway obstruction that occurs during intense work. The soft palate flips out of position and partially blocks the airway, producing a characteristic "gurgling" sound and sudden loss of speed/power. The horse may finish poorly or pull up. Diagnosis requires dynamic endoscopy (scoping during or simulating exercise). Surgical and conservative treatments exist depending on the case.
Yes — extraordinarily common in racing and performance horses. EGUS prevalence in racehorses is up to 90%. Ulcers cause weight loss, decreased appetite, irritability, and reduced performance — all of which can contribute to late-race fade. Endoscopy is the only definitive diagnostic. If your horse is fading and you haven't scoped for ulcers, that's the next step. Visit our dedicated ulcers site for the full workup →
Hair mineral analysis cannot diagnose EIPH, DDSP, ulcers, cardiac issues, or any structural cause of late-race fade. What it can do is identify selenium status (paired with vitamin E for muscle antioxidant defense), magnesium status, electrolyte balance (sodium, potassium, chloride for sweating horses), iron status (anemia indicator), and rule out heavy-metal exposure that may worsen oxidative stress and recovery. The honest framing: hair analysis is one supportive input alongside the vet workup, never a substitute for it.
In order: (1) Vet exam — scope the upper airway for DDSP, scope post-exercise for EIPH, scope the stomach for ulcers, listen to the heart, check for hidden lameness. (2) Bloodwork — CBC for anemia, muscle enzymes (CK/AST) post-exercise to rule out sub-clinical tying-up, electrolytes during/after work. (3) Genetic testing for PSSM/MFM/RER if breed-appropriate. (4) Mineral status via hair analysis to optimize the nutritional support around the diagnosed issues. Skip the structured workup and you're guessing.
Yes — but in supportive, not primary, ways. Selenium and vitamin E pair as the antioxidant defense for working muscle. Magnesium is required for ATP production and muscle relaxation between contractions. Sodium, potassium, and chloride are lost in sweat and must be replaced. Iron supports oxygen carrying. Adequate mineral status doesn't manufacture finishing kick where conditioning isn't there — but inadequate mineral status can absolutely cap a fit horse's performance.
Approximately 9-12 calendar days from order to results: 2 days for kit shipping, 5 minutes to collect, 5-7 days at the lab. You receive an emailed report plus a follow-up phone consultation focused on the performance-mineral picture and what to bring to your vet alongside the workup.
Each microsite covers one specific equine health topic. Start with the clinical pillar reference →