Equine Nutrition Basics: What Should Horses Eat? (2026 Guide)

Good equine nutrition starts with a simple principle: feed the individual horse in front of you, not a generic label. Age, body condition, workload, forage quality, dental health, environment, and medical history all affect what a horse needs. For most horses, forage remains the foundation; concentrates and supplements should fill a documented gap rather than substitute for a thoughtful feeding plan.

What nutrients do horses need?

Horses need energy, protein, water, vitamins, and minerals, but the amounts vary. Energy comes primarily from forage and is influenced by the horse’s size, work, metabolism, and temperature. Protein supports tissue maintenance, growth, reproduction, and muscle repair; “more” is not automatically better. Vitamins and trace minerals are required in smaller amounts, yet deficiencies or excesses can matter. Water is the essential nutrient that is easiest to underestimate.

AAEP describes horses as grazing herbivores whose digestive systems are adapted to frequent forage intake. That is why a feeding plan should begin with hay or pasture, then consider whether the forage analysis and the horse’s condition justify anything else.

Build the ration around forage

Choose clean, mature-appropriate hay that the horse will eat consistently. Mold, dust, weeds, spoilage, and sudden changes in hay can create health and intake problems. Weigh forage rather than estimating by flakes: bale density varies, so two flakes can represent very different amounts. A practical starting range for many adult horses is roughly 1.5% to 2.5% of body weight per day in forage, then adjust with body-condition monitoring and professional advice.

Pasture can be excellent forage, but lush grass is not risk-free for every horse. Horses prone to obesity, insulin dysregulation, or laminitis may need controlled turnout, a dry lot, a grazing muzzle, or a lower-sugar forage plan. Management should be individualized; do not assume that a pasture looks safe because another horse thrives on it.

Use hay analysis instead of guessing

A hay test can estimate energy, crude protein, fiber, and minerals. That information helps identify whether the forage is adequate for the horse’s life stage and workload and whether a ration balancer is appropriate. UMN Extension notes that mineral content varies among hays, so a “complete” looking diet can still be short of key nutrients.

Keep the report with the feeding records and compare it with the label of any concentrate or supplement. Avoid stacking products that repeat the same selenium, copper, zinc, or other ingredients. If the horse has metabolic disease, muscle disease, kidney or liver disease, or a history of laminitis, have the ration reviewed rather than making isolated supplement decisions.

When concentrates and ration balancers help

Some horses need extra calories because of work, age, poor dentition, limited forage, or difficulty maintaining weight. Others need very little beyond forage and a targeted vitamin-and-mineral source. A ration balancer can supply nutrients that forage lacks without the calorie load of a large grain meal. It is still a feed, however: follow the product’s feeding rate and weigh it.

Introduce any new feed gradually over about a week or longer, dividing concentrate into small meals. Sudden increases in starch or large meals can upset the hindgut and increase risk. Do not use supplements to hide unexplained weight loss, poor topline, diarrhea, repeated choke, or a change in appetite; those signs warrant veterinary assessment.

Water, salt, and feeding routine

Provide continuous access to clean water and check buckets, troughs, automatic drinkers, and heaters every day. Intake can change with heat, exercise, lactation, illness, and weather. Clean containers regularly and watch for algae, manure contamination, freezing, or a horse that is suddenly drinking much more or less than usual.

Salt is part of normal electrolyte management, but the appropriate approach depends on the horse, climate, workload, and the rest of the ration. Keep plain salt available only in a way your veterinarian considers safe, and do not assume that a salt block replaces water or a complete electrolyte plan after heavy sweating.

Monitor the horse, not just the feed label

Record body weight when possible, body-condition score, manure consistency, appetite, workload, and any ration changes. Use a weight tape as a trend tool rather than an exact scale. Look at ribs, neck crest, topline, hindquarters, and overall muscle condition. Dental examinations matter because a horse that cannot chew forage efficiently may need a different form of feed.

Call your veterinarian promptly for colic signs, choke, suspected laminitis, repeated diarrhea, severe muscle stiffness, sudden appetite loss, or rapid unexplained weight change. Nutrition is part of medical care, not a replacement for it.

Related horse-care guides

• Can a Horse Live on Hay or Grass Alone?
• The Hidden Dangers of Overfeeding Treats to Horses
• Can You Give Horses Human Vitamins?
• Is It Safe for Horses to Drink Rainwater?

Frequently asked questions

What should make up most of a horse’s diet?

For most adult horses, forage such as pasture or hay should provide the foundation. The right amount and type depend on body condition, workload, age, health, and forage analysis.

How much hay does a horse need each day?

A common starting range is about 1.5% to 2.5% of body weight per day as forage, but it is not a universal prescription. Adjust with body-condition monitoring and professional guidance.

Does every horse need grain?

No. Some horses do well on forage plus a correctly chosen vitamin-and-mineral source. Concentrates are useful only when the horse’s energy or nutrient needs justify them.

When should I ask a veterinarian about diet?

Ask when weight changes unexpectedly, dental or digestive problems appear, laminitis is suspected, or the horse is growing, pregnant, ill, or undergoing a major ration change.

Sources

• AAEP: Hay Quality and Horse Nutrition
• University of Minnesota Extension: Using Hay in Horse Diets
• University of Minnesota Extension: Understanding Your Hay Analysis
• Penn State Extension: Horse Feed and Nutrition