Free-choice hay means leaving hay available to your horse around the clock so it can eat whenever it wants, rather than portioning out meals at set times. The idea mirrors how horses naturally graze: in the wild, they spend 12 to 16 hours a day eating small amounts of forage almost continuously. When given unrestricted access, most horses will eat about 2 to 2.5% of their body weight in hay per day, which for a 1,000-pound horse works out to roughly 20 to 25 pounds.
Why Continuous Forage Matters
A horse’s stomach produces acid constantly, not just when food arrives. When there’s nothing in the stomach to absorb that acid, the unprotected upper lining gets splashed and irritated. This is a major driver of gastric ulcers, which affect a surprisingly large percentage of performance and stabled horses. Chewing hay triggers a steady flow of saliva, and saliva is a natural acid buffer. The longer the hay stem, the more chewing required and the more saliva produced. Alfalfa hay, which is high in calcium, is an especially effective buffer on top of the saliva effect.
Free-choice hay keeps this buffering system running throughout the day. Horses that go hours between meals lose that protection, and the gap between evening feeding and morning feeding is often the longest and most damaging stretch.
Behavioral Benefits of Unlimited Forage
Horses with limited hay access show significantly more abnormal behaviors than those with unlimited forage. A study published in Frontiers in Veterinary Science found that horses on restricted forage had measurably higher rates of stereotypic behaviors: crib-biting, bar gnawing, weaving, door kicking, tongue rolling, and licking non-food surfaces. Horses with unrestricted forage exhibited little or no abnormal behavior.
The differences went beyond obvious habits. Horses on restricted hay pinned their ears backward while eating at significantly higher rates, a recognized indicator of negative emotional state that rarely appears in horses grazing under natural conditions. In short, limiting hay doesn’t just create boredom. It creates genuine stress, and that stress shows up in measurable ways.
When Free-Choice Hay Is Not Safe
Not every horse can handle unlimited hay. Horses with equine metabolic syndrome (EMS) are at high risk for laminitis when they consume too many calories or too many sugars, and unrestricted hay can push them past safe thresholds. For these horses, UC Davis recommends starting at 1.5% of ideal body weight per day in forage, potentially dropping to 1.25% after 30 days if weight loss isn’t progressing. Sudden, dramatic feed restriction should be avoided because it can spike blood fat levels and worsen insulin resistance.
Sugar content in the hay itself also matters. For metabolically sensitive horses, non-structural carbohydrates (the sugars and starches in hay) should make up less than 10% of the hay’s dry matter. A hay analysis is the most reliable way to confirm this. Soaking hay in water can reduce sugar levels, but the actual reduction varies so much that it’s not a dependable method on its own. Teff hay is one variety that tends to run naturally low in sugars, often falling between 5 and 9%, which keeps it below that 10% threshold.
Older horses can develop a pituitary condition (PPID, sometimes called Cushing’s) that worsens insulin resistance on top of existing metabolic issues. If your horse has both conditions, managing forage becomes even more important.
Slow Feeders: Stretching Free-Choice Hay
Many horse owners want the benefits of constant forage access without the worry of a horse plowing through its hay in a few hours. Slow-feeder nets solve this by forcing the horse to pull hay through small openings, which slows intake and extends eating time. A University of Minnesota study tested different net hole sizes and found clear differences in consumption speed. Horses eating loose hay off the ground or from nets with 6-inch openings consumed about 3.3 pounds per hour. Nets with 1.25-inch openings cut that rate nearly in half, to about 1.9 pounds per hour, and some horses couldn’t finish their hay within four hours.
There’s no single “correct” hole size. Ponies with smaller muzzles may need different sizing than large warmbloods. The practical takeaway is that moderately small openings (in the 1.25 to 1.75 inch range) effectively slow consumption and more closely replicate the natural pace of grazing. This makes slow feeders one of the best tools for offering free-choice hay while managing how quickly it disappears.
Reducing Waste With Round Bales
For farms feeding free-choice hay to groups of horses, round bales are common but come with significant waste. Bales left uncovered on the ground lose quality quickly as the bottom layer absorbs moisture and horses trample loose hay into the dirt. One study comparing feeder designs found that an open-style “Tombstone” feeder wasted an average of 221 kilograms (about 487 pounds) of hay per bale, with loss rates between 10 and 30%. A more enclosed feeder design cut waste to just 54 kilograms (about 119 pounds) per bale. If you’re going the round-bale route, the feeder design matters enormously for both your budget and hay quality.
Choosing the Right Hay
For most healthy adult horses on a free-choice program, a good-quality grass hay is the standard choice. Timothy, orchard grass, and Bermuda grass are all common options. These tend to be moderate in calories and sugars, making them safe for around-the-clock access without excessive weight gain. A typical adult horse eating free-choice grass hay will naturally regulate intake somewhere between 1.5 and 2.5% of body weight per day.
Alfalfa is higher in protein and calories, so feeding it free-choice can lead to weight gain in easy keepers. It works well as a portion of the hay ration, especially for hard keepers, growing horses, or lactating mares who need extra nutrition. Mixing alfalfa with grass hay gives you the stomach-buffering benefits of the calcium content while keeping overall calorie density in check.
For metabolically sensitive horses, teff hay offers a naturally low-sugar profile. Getting any hay tested before committing to free-choice feeding is a worthwhile step, since sugar and calorie content can vary significantly between cuttings, regions, and growing conditions, even within the same hay type.