Horse Forage Requirements: How Much Hay Per Day? | Inside the Equine

Horse Forage Requirements: How Much Hay Per Day?

Ask ten horse owners how much hay their horse gets and you'll hear things like "two flakes morning and night" or "I just throw some in there." Flakes vary in size. Bales vary in density. "Some" is not a unit of measurement. And most horses in this country are either overfed or underfed because nobody bothered to do the math.

Quick Answer: Horses need 1.5 to 2% of their body weight in forage daily (15 to 20 pounds for a 1,000-pound horse). Forage is the foundation of every equine diet, and going without it for more than 4 hours increases the risk of ulcers and colic.

The math isn't hard. It just requires a scale and five minutes of your time.

How Much Forage Does Your Horse Actually Need?

Every horse needs a minimum of 1.5% of its body weight in forage per day. That's the floor, not the target. Most horses do best at 2% or slightly above. For a 1,100-pound horse, that works out to 16.5 to 22 pounds of hay daily.

Sixteen and a half pounds. Minimum. That surprises a lot of people, especially those tossing two small flakes twice a day and calling it done. A typical flake of grass hay weighs 3 to 5 pounds depending on how tightly the baler packed it. Four flakes at 4 pounds each gives you 16 pounds. That's cutting it close.

The National Research Council's Nutrient Requirements of Horses sets this 1.5% minimum. AAEP nutrition guidelines echo it. Texas A&M's equine extension program publishes the same number. This isn't controversial science. It's settled. And yet barns all over the country feed below it because nobody owns a scale.

Forage isn't optional. It's not a filler you add around the "real" nutrition in the grain bucket. The equine digestive system evolved over millions of years to process a continuous stream of fibrous plant material. The hindgut (cecum and large colon) houses billions of microorganisms that ferment fiber into volatile fatty acids, which provide the majority of the horse's energy. Without adequate forage, that entire system breaks down.

What Happens When Forage Falls Short

  • Gastric ulcers: the stomach produces acid 24/7 regardless of whether there's food to buffer it. Extended empty periods let acid splash onto the unprotected squamous lining of the upper stomach.
  • Hindgut dysfunction: the microbial population crashes when it doesn't have fiber to ferment. This leads to loose stool, poor nutrient absorption, and increased colic risk.
  • Behavioral issues: wood chewing, cribbing, aggression at feeding time, eating bedding. A horse with an empty gut is a stressed horse.
  • Weight loss despite adequate calories from grain, because the gut isn't functioning efficiently enough to extract nutrition.
Grain supplements the diet. Forage IS the diet. Every feeding plan starts with hay, and everything else is built on top of it.

Weighing Hay: The Bathroom Scale Trick

You need to weigh your hay. Not once as a curiosity. Regularly. Here's the low-budget method that actually works.

Step on a bathroom scale. Note your weight. Then pick up a hay flake (or two, or three) and step on again. Subtract. That's your hay weight. Do this with 10 random flakes from different bales and average the results. Now you know what a flake from your current hay lot actually weighs.

Why the sampling matters: flakes from the center of a bale are denser than those from the outside. First cutting is often coarser and lighter per flake than second or third cutting. Different fields, different densities. If you switch hay suppliers or even get a new load from the same farm, weigh again.

For barns feeding large numbers of horses, a hanging fish scale (the kind bass fishermen use) works even better. Clip it to a hay net, hang, read. Ten seconds per horse. No excuses.

Hay Types and What They Offer

UC Davis Center for Equine Health has published extensively on hay quality variation, noting that protein content in grass hay can range from 6% to 14% depending on maturity at harvest, species, and soil fertility. A single number on a feed tag tells you almost nothing. Get your hay tested. Equi-Analytical will run a basic panel for the price of a fast-food lunch, and the information is worth infinitely more than guessing.

Timothy

The gold standard of horse hay in much of North America. Moderate calorie content, good fiber, relatively low sugar. Horses eat it readily. First cutting tends to be stemmy with more fiber and fewer calories. Second cutting is softer, leafier, and more calorie-dense. Either works for most horses.

Orchard Grass

Softer than timothy, palatable, and grows well in diverse climates. Nutritionally similar to timothy though sometimes slightly higher in calories. Horses that are picky about stemmy hay often prefer orchard grass. It's an excellent all-around choice.

Bermuda

Dominates in the South and Southwest. Texas A&M calls it the backbone of equine forage programs from San Antonio to Savannah. Fine-stemmed and often very palatable. The major concern with bermuda is its association with ileal impaction, a specific type of colic where the fine fibers compact at the junction of the small and large intestine. Coastal bermuda has a higher reputation for this than Tifton varieties. Feeding a mix of bermuda and another hay type, and ensuring adequate water intake, reduces the risk.

Alfalfa

Not a grass. It's a legume. Significantly higher in protein (15 to 22%) and calories than grass hay. Also higher in calcium. Alfalfa is a fantastic feed for hard-working horses, lactating mares, and growing youngstock that need the extra nutrition. It's a poor choice as the sole forage for easy keepers, metabolic horses, or idle adults who'll turn into blimps on it.

Many feeding programs use alfalfa as 20 to 30% of the total forage ration, mixed with grass hay. This boosts protein and palatability without overloading calories. The buffering effect of alfalfa's calcium content may also help reduce gastric ulcer risk, which is why some vets recommend a flake of alfalfa before exercise.

Why Is NSC Content Critical for Metabolic Horses?

Non-structural carbohydrates (NSC) include sugars (ESC) and starch. For horses with insulin dysregulation, equine metabolic syndrome, PPID (Cushing's), or a history of laminitis, NSC content in forage is not a minor detail. It's the difference between soundness and founder.

The target: total NSC below 10% on a dry matter basis. Ideally below 12% at minimum. The only way to know the NSC content of your hay is to test it. Equi-Analytical and Dairy One both offer hay analysis for around $25 to $55 per sample. That's cheap insurance.

Reducing NSC in Hay

If your hay tests above 12% NSC and you're feeding a metabolic horse, soaking can help. Submerge the hay in cold water for 30 to 60 minutes (or warm water for 15 to 30 minutes), then drain thoroughly. Soaking leaches water-soluble sugars and can reduce NSC by 20 to 40%, though results vary. The downside: soaked hay also loses some minerals and vitamins, and it spoils faster in warm weather. Feed it within a few hours of soaking.

Slow Feeders: Making Hay Last

Throwing hay on the ground or in an open feeder means most horses inhale their entire ration in 3 to 4 hours and then stand around with empty stomachs for the next 8 to 12 hours. That's a ulcer factory.

Slow feeder hay nets with small openings (1.5 to 1.75 inch mesh works well for most horses) can extend eating time to 6 to 10 hours. The horse eats in a more natural trickle pattern, saliva production increases (buffering stomach acid), and you waste dramatically less hay to trampling and soiling.

A few practical notes on slow feeders:

  • Start with a larger mesh size if your horse gets frustrated. Some horses will rage-quit a 1-inch net.
  • Hang nets at chest height or use ground-level feeder bags. High-mounted nets force an unnatural head position that strains the neck and TMJ over time.
  • Check teeth regularly. Aggressive net users can develop unusual wear patterns, though this is uncommon with quality nets.
  • For horses that paw at nets, use a hay pillow or ground feeder rather than a hanging net they can tangle in.

When Pasture Counts

Pasture is forage. Good pasture can provide all or most of a horse's forage requirements during the growing season. But "good pasture" means something specific: at least 3 to 4 inches of growth across adequate acreage (general rule is 2 to 3 acres per horse, depending on soil quality and rainfall).

The catch is that pasture quality fluctuates wildly. Spring grass can have NSC levels above 30%, which is a metabolic horse's nightmare. Stressed grass (drought, frost, intense sun after rain) concentrates sugars even further. A lush green field is not automatically safe.

For horses with metabolic concerns, pasture access should be managed carefully. Grazing muzzles reduce intake by roughly 30 to 80% depending on the design and the horse's creativity in defeating it. Limited turnout during lower-sugar hours (late night through early morning) can help, though this depends on your climate and grass species.

For healthy horses without metabolic issues, good pasture plus free-choice hay available when pasture is thin is about as close to ideal as you can get. That's how horses are supposed to eat: continuously, head down, moving slowly across a landscape.

The Merck Veterinary Manual's nutrition chapter puts it bluntly: horses evolved as continuous grazers, and management systems that restrict forage access create physiological stress regardless of total caloric intake. Cornell's equine nutrition group has published similar conclusions, noting that meal-fed horses show elevated cortisol compared to horses with ad libitum hay access even when total daily intake is identical. The gut knows the difference between feast-and-famine and steady supply. It always knows.

One more thing worth mentioning. Water. A horse consuming 20 pounds of dry hay needs a minimum of 10 to 12 gallons of fresh water daily just to process that fiber. Dehydration plus high fiber intake equals impaction colic, and impaction colic is one of the most common surgical emergencies in equine practice. Forage without water is a trap.

Forage is the foundation of equine nutrition. Get this right and most other feeding questions become simpler. Get it wrong and no amount of expensive supplements will compensate. Weigh your hay, know what you're feeding, and when in doubt, feed more fiber rather than more grain. Your horse's gut will thank you.

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Last reviewed: March 2026

Frequently Asked Questions

How many pounds of hay does a horse need per day?

A horse needs a minimum of 1.5% of its body weight in forage daily, with most doing best at 2%. For a 1,000-pound horse, that is 15 to 20 pounds of hay per day. For a 1,100-pound horse, 16.5 to 22 pounds. Weigh your hay flakes rather than guessing, since flake weight varies from 3 to 5 pounds depending on bale density and cutting.

How long can a horse go without hay before health problems start?

Going without forage for more than 4 hours increases the risk of gastric ulcers because the horse's stomach produces acid continuously whether food is present or not. Extended empty periods let acid damage the unprotected upper stomach lining. Slow feeder nets with 1.5 to 1.75 inch mesh can extend eating time from 3 to 4 hours to 6 to 10 hours.

What NSC level is safe for a horse with metabolic syndrome?

Total NSC (sugars plus starch) should be below 10% on a dry matter basis for horses with insulin dysregulation, equine metabolic syndrome, PPID, or a history of laminitis. Hay testing through labs like Equi-Analytical costs $25 to $55 per sample. If hay tests above 12%, soaking in cold water for 30 to 60 minutes can reduce NSC by 20 to 40%.

Is alfalfa hay safe for horses?

Alfalfa is safe and beneficial for hard-working horses, lactating mares, and growing youngstock due to its higher protein (15 to 22%) and calorie content. It is not ideal as the sole forage for easy keepers, metabolic horses, or idle adults. Many feeding programs use alfalfa at 20 to 30% of the total forage ration mixed with grass hay to boost protein without overloading calories.

For a deeper look at balancing your horse's entire diet beyond forage, check our horse nutrition guide.

🧫 See how the equine digestive system processes forage in our 3D Explorer

Sources

  • Texas A&M AgriLife Extension. "Hay Quality and Horse Nutrition." agrilifeextension.tamu.edu
  • National Research Council. Nutrient Requirements of Horses, 6th Revised Edition. National Academies Press, 2007.
  • UC Davis Center for Equine Health. "Feeding the Horse." ceh.vetmed.ucdavis.edu
  • AAEP. "Nutrition for Horses." aaep.org
  • Merck Veterinary Manual. "Nutritional Requirements of Horses." merckvetmanual.com