Skip to main content
FurCalc

Thoroughbred Feed Calculator — Racehorse Nutrition & Workload Scaling

Feed calculator for Thoroughbreds in race training, OTTB retraining, or pleasure work. High-energy demands require careful management of concentrate + forage ratios to prevent gastric ulcers (80–90 % prevalence in racehorses) and support performance.

Calculator

Enter inputs to enable Save / Email

Hard keepers maintain weight poorly; easy keepers founder on too much feed.

Daily feed
20lb / day
Forage (hay)
20 lb
Grain / concentrate
0 lb
Free-choice forage is ideal. Split grain into 2-3 meals of < 5 lb each to prevent colic.

How to use the Thoroughbred feed calculator

  1. Select Thoroughbred / workload — Heavy (race training), moderate (OTTB retraining), light (pleasure/trail).
  2. Enter body weight — Typical 900–1,200 lb for Thoroughbreds.
  3. Read total feed + forage — Output: hay lb/day + concentrate lb/day split into 3–4 meals.
  4. Add ulcer protection + electrolytes — Recommended additions for horses in heavy work.

Thoroughbred feed by workload

WorkloadHay (lb/day)Concentrate (lb/day)Total
Retired / pasture only15–200–21.5 % BW
Light work (3–4× wk, trail/pleasure)18–223–52 % BW
Moderate (5–6× wk, jumping, eventing)20–226–102.5 % BW
Heavy (daily, race training)22–2410–153 % BW
Elite / racing campaign22–2413–183 %+ BW

Split total daily concentrate across 3–4 meals, never exceeding 5 lb per meal. Larger meals overwhelm gastric capacity and increase colic/ulcer risk.

Gastric ulcer prevention in performance Thoroughbreds

Equine Gastric Ulcer Syndrome (EGUS) affects 80–90 % of Thoroughbreds in race training and 40–60 % of performance horses in any discipline. Standard prevention strategies from the AAEP and racing veterinary consensus:

  • Free-choice forage: Hay available 24/7 to buffer stomach acid continuously.
  • Alfalfa before exercise: 2–4 lb alfalfa hay 15–30 min before riding. Calcium and protein buffer acid during exercise.
  • Small frequent concentrate meals:Never > 5 lb per meal; 3–4 meals daily vs. 2 large ones.
  • Omeprazole during training blocks: Prescription GastroGard (4 mg/kg) or compounded omeprazole daily during intense training.
  • Reduce stress: Consistent turnout, stable companions visible, minimize shipping.
  • Regular scoping: Gastroscopy every 3–6 months for horses in heavy work to monitor ulcer status.

Frequently Asked Questions

How much do Thoroughbreds eat per day?

A 1,100 lb (500 kg) Thoroughbred in full race training consumes 22–24 lb hay + 10–15 lb concentrate feed per day — roughly 2.5–3 % of body weight in total dry matter. Pleasure / trail Thoroughbreds in light work: 1.5–2 % body weight (17–22 lb total). Retired/spelled Thoroughbreds on pasture: 1.5 % body weight or less. Splitting concentrate into 3–4 daily meals of ≤ 5 lb each prevents colic.

What is the best feed for a racehorse?

High-fat, high-fiber commercial performance feeds: Purina Omolene 200 or Strategy Healthy Edge, Legends CarbCare Performance, Kentucky Equine Research Re-Leve, Triple Crown Performance. These provide 8–12 % fat from vegetable oil or stabilized rice bran — a &ldquo;cool&rdquo; energy source that doesn't cause hot behavior. Avoid traditional high-starch sweet feeds for race training as they contribute to gastric ulcers and behavior issues.

Why do Thoroughbreds need special feeding compared to other horses?

Thoroughbreds have been selected for 300+ years for speed — the result is a racehorse metabolism with fast gastric emptying, higher stress-ulcer susceptibility, and high caloric demands during training. 80–90 % of racehorses in training have gastric ulcers (detected by gastroscopy). Feeding strategy addresses this: frequent small meals, alfalfa (calcium buffers stomach acid) before exercise, omeprazole during training blocks, and constant access to forage.

How do I transition a retired racehorse (OTTB) to pleasure horse feeding?

Reduce concentrate feed gradually over 4–6 weeks as workload drops. Maintain 1.5–2 % body weight in quality hay. Replace racing feed with a lower-calorie ration balancer (Triple Crown 30 %, Purina Enrich Plus) or senior feed if over 18 years. Many OTTBs thrive on a diet of just hay + vitamin/mineral balancer when in light work. Monitor body condition monthly — most OTTBs adjust to lower-intensity feeding within 3–6 months post-track.

Should racehorses have pasture turnout?

Yes when possible. Even 4–6 hours of pasture turnout daily improves digestive health, reduces ulcer incidence, provides natural movement, and supports mental health. Many US racetrack training barns now provide individual turnout paddocks specifically for these benefits. Research from Kentucky Equine Research (KER) shows racehorses with daily turnout recover faster from hard workouts and have lower injury rates.

What supplements benefit performance Thoroughbreds?

Evidence-backed supplements: omega-3 fatty acids (flax or fish oil, anti-inflammatory), electrolytes (Summer Games, Perform N Win, especially in hot climates), gastric support (Ulcerguard, Succeed, or compounded omeprazole), joint support (hyaluronic acid, glucosamine, Adequan IM injections), vitamin E (pasture access often insufficient). Work with an equine nutritionist — random supplement stacking wastes money and occasionally interferes with training.

Sources & References

  1. [1]
  2. [2]
    Thoroughbred Performance Nutrition — Purina Equine Nutrition
  3. [3]
    Equine Gastric Ulcer Syndrome — Merck Veterinary Manual
  4. [4]
    AAEP Feeding Guidelines — American Association of Equine Practitioners