Hay for Horses

Hay is dried grass or legume forage that forms the nutritional foundation for every horse's diet. Unlike grain or other supplements, hay provides the long-stem forage that a horse's digestive system evolved to process continuously throughout the day. A horse that doesn't get adequate hay doesn't just experience nutritional deficiency—they develop behavioral problems from boredom, digestive issues from eating concentrate too quickly without forage to slow gastric transit, and often lose weight despite seeming to eat plenty.

The amount of hay a horse eats varies with body size, metabolism, activity level, and forage quality. A 1,000-pound horse in light work typically eats 15-20 pounds of hay daily, which might be 50-80 percent of their total daily intake depending on whether they're also eating concentrate. Some horses in maintenance on good pasture eat minimal hay. Others—particularly hard keepers or senior horses—might eat 25-30 pounds of hay daily plus concentrate and still struggle to maintain condition.

Hay quality varies enormously, affecting both nutritional content and how much your horse needs to eat to meet their requirements. Premium timothy or orchard grass hay cut at optimal maturity contains more digestible nutrients than poor-quality hay that's been rained on, stored poorly, or harvested overly mature. Feeding excellent-quality hay often means you can feed less total weight while providing superior nutrition. Conversely, poor-quality hay requires significantly larger quantities to meet nutritional needs.

The hay-to-grain ratio in your feeding program depends on your horse's individual needs and the quality of hay available. A horse with easy access to good pasture might need minimal hay and concentrate. A stabled horse eating only hay and grain might eat 60 percent hay and 40 percent concentrate by weight, or the ratio might reverse depending on the horse's requirements and your management approach.

Understanding hay's role in your feeding program puts you in control. Horses that receive adequate, quality hay experience better health, fewer digestive problems, more stable behavior, and more efficient use of the concentrate you feed. Hay isn't something to minimize to save money or space—it's the nutritional cornerstone that makes everything else in your feeding program work effectively.

Hay's nutritional profile depends heavily on the type of grass or legume it's made from and the stage of maturity when it's harvested. Timothy hay, one of the most common horse hay types, contains approximately 7-10 percent protein, 30-35 percent crude fiber, and roughly 800-900 calories per pound when it's good quality. It's lower in calcium than alfalfa but provides a balanced mineral profile appropriate for most horses. Timothy harvested at boot stage (early heading) contains more protein and nutrients than timothy harvested when fully mature and seed-headed.

Orchard grass hay typically contains 8-11 percent protein with similar caloric content to timothy but slightly different fiber characteristics. It's softer and more palatable to many horses, though it's more expensive than timothy. Orchard grass hay often grows more luxuriantly than timothy, meaning you can achieve good nutrition from slightly later-harvest hay without sacrificing quality as much as you might with timothy.

Alfalfa hay provides significantly more protein—15-20 percent depending on harvest stage—and more calories per pound than grass hays, around 950-1,050 calories. Alfalfa also contains substantially more calcium than grass hays, which is why balancing alfalfa with appropriate grain becomes important. Alfalfa is an excellent choice for growing horses, performance horses, or any horse needing higher protein. However, alfalfa fed to easy keepers or senior horses prone to laminitis requires careful management.

Mixed grass-legume hay falls between pure grass and pure alfalfa in nutrition, typically providing 10-14 percent protein and approximately 850-950 calories per pound. These mixes are common in many regions and work well for most horses on standard maintenance programs. A mixed hay might contain timothy, orchard grass, alfalfa, and clover, each contributing to the overall nutritional profile.

Moisture and hay quality significantly affect how much nutrition a horse gets from hay. A high-quality timothy hay in late boot stage can contain 12+ percent protein, while poor-quality, fully mature timothy might contain only 4-5 percent. Rain-damaged hay loses nutrients and can develop mold. Hay that's been exposed to sunlight bleaches out carotenoids and other nutrients. Proper storage—dry, well-ventilated, protected from weather—preserves hay's nutritional content from harvest through feeding.

Minerals in hay matter, particularly calcium, phosphorus, magnesium, potassium, and trace minerals like copper and zinc. Good-quality hay provides adequate levels of most minerals, though copper deficiency can occur in areas with naturally low copper in soil. Alfalfa provides excellent mineral content, particularly calcium and magnesium. Grass hays are usually adequate but might be borderline for certain minerals, making mineral supplementation appropriate for some horses.

Calculate your hay requirements based on your horse's size, body condition, and activity level. A rule of thumb is that a horse should eat approximately 1.5-2 percent of their body weight in forage daily. A 1,000-pound horse needs 15-20 pounds of hay daily minimum. This is the baseline—some horses need more, particularly young horses in growth, hard keepers, or horses doing heavy work.

Assess your hay quality before deciding how much to feed. If you have excellent quality hay, your horse might thrive on 15 pounds daily. If your hay is poor quality with low digestibility, your horse might need 20-25 pounds daily to meet the same nutritional requirements. Testing hay through a forage analysis lab provides exact nutritional information, though visual assessment and knowing your hay source helps with estimation.

Choose hay type based on your horse's specific needs. Young horses in growth benefit from alfalfa or alfalfa mixes for protein and calcium. Performance horses do well on high-quality grass hays or grass-alfalfa mixes that provide adequate protein without excess energy that might create behavioral challenges. Easy keepers often do best on moderate-quality timothy hay, which is lower in calories than alfalfa. Senior horses or those with dental problems might need hay processed in some way—soaking, chopping, or as complete feed pellets.

Store hay properly to preserve quality. Stack hay off the ground on pallets or boards to allow air circulation and prevent moisture absorption from below. Protect from rain and snow with tarps or storage buildings. Allow air circulation around hay stacks rather than wrapping hay tightly, which can promote mold growth. First-cut hay (early season) typically has higher quality than later cuts, so prioritizing first-cut hay when possible improves overall feed quality.

Introduce hay changes gradually when switching from one type or source to another. If you need to change from timothy to alfalfa or vice versa, do so over 5-7 days, gradually increasing the percentage of new hay while decreasing the old. This gives your horse's digestive bacteria time to adjust to different forage types and compositions.

Monitor hay intake by weighing what you feed and what's left over. Many owners guess at amounts, but actually measuring shows you whether your horse is getting adequate forage. A horse that consistently leaves hay might indicate poor quality, illness, or other problems. One that seems hungry on what you're providing indicates you need to increase quantity.

Easy keepers often do well on moderate-quality timothy hay fed without restriction or with actual portioning to prevent overfeeding. An easy keeper maintained on good hay might not need grain concentrate at all, though mineral supplementation becomes important to ensure balanced micronutrient intake. The key is preventing weight gain from excessive calories while maintaining adequate forage for digestive health.

Hard keepers need high-quality hay, often supplemented with alfalfa or alfalfa mixes to increase protein and calories. A hard keeper might eat premium timothy hay plus alfalfa hay as separate flakes, or might eat mixed timothy-alfalfa hay that provides moderate protein without being exclusively high-protein. The point is maximizing the nutritional return from every pound of hay fed.

Performance horses benefit from high-quality hay of any type that supports the energy demands of work. A dressage horse might thrive on timothy hay with grain concentrate, while an endurance horse might benefit from alfalfa or alfalfa-mix hay that provides higher protein for muscle recovery. The key is matching hay quality to the horse's work demands.

Senior horses often prefer softer hay, though preference varies by individual. An older horse with intact teeth typically eats long-stem hay well. One with significant dental loss might benefit from hay that's been chopped, soaked, or processed into complete feed pellets. Alfalfa hay is often excellent for seniors because its relative softness makes chewing easier than some grass hays, and its nutrient density means the horse gets good nutrition despite potentially reduced chewing efficiency.

Young horses in growth and training benefit from protein-rich hay—alfalfa or alfalfa mixes—combined with appropriate grain to support development. A 2-year-old in training needs more protein and minerals than a mature horse, and high-quality legume hay supports those increased requirements. As young horses mature and training stabilizes, feeding requirements often adjust toward more moderate hay types.

Feeding poor-quality hay while assuming quantity will compensate creates multiple problems. A horse eating large quantities of low-nutrition hay doesn't gain weight, develop proper muscle, or achieve good health despite eating seemingly adequate amounts. Poor hay often contains mold or dust that predisposes to respiratory problems. Investing in quality hay rather than buying more of poor-quality hay typically saves money and produces better results.

Thinking all hay is equivalent leads to poor feeding decisions. Timothy hay and alfalfa hay have dramatically different nutritional profiles—feeding them at the same quantity creates very different outcomes. An easy keeper that thrives on timothy hay would become overweight on equivalent amounts of alfalfa. A hard keeper would struggle on timothy alone when alfalfa would better support weight gain.

Not storing hay properly causes nutrient loss through weathering, mold development, or moisture damage. Hay that's been rained on loses nutrients and can develop mold that causes respiratory problems or digestive upset. Hay stored in damp conditions develops mold even if initially dry. Proper storage is essential for preserving the quality you're paying for.

Assuming that a horse eating plenty of hay is getting adequate nutrition is incorrect. The quality of that hay determines whether the horse's nutrition is adequate. A horse eating 20 pounds of poor-quality hay daily might actually be receiving less nutrition than one eating 15 pounds of excellent-quality hay.

Not adjusting hay type when your horse's needs change causes problems. A hay appropriate for an easy keeper is inadequate for that same horse when they're working harder or pregnant. A hay that's perfect for a young horse in training becomes too rich when that horse retires. Periodically reassessing your hay choice relative to your horse's current situation ensures feeding appropriateness.

Build a relationship with your hay supplier and prioritize quality consistency. Buying from the same source throughout the season, if possible, ensures your horse's hay diet remains consistent and you understand what you're feeding. Different sources can have very different hay quality even when both claim to be timothy hay.

Have your hay tested through a forage analysis lab if you're dealing with specific health conditions, feeding challenges, or performance goals. The exact nutritional information from testing eliminates guessing and lets you create a truly precise feeding program. Many university extension programs offer forage testing services at reasonable costs.

When evaluating hay quality, look at color (bright green indicates good preservation; dark or moldy indicates weather damage), smell (fresh, pleasant smell is good; musty smell indicates mold), and feel (soft, fine stems indicate early harvest; coarse, brittle stems indicate late harvest). These visual and tactile clues help you assess hay quality before purchase.

Consider your climate and storage options when choosing hay type. In humid climates, first-cut hay might mold more readily than later cuts that are drier at harvest. In arid climates, hay stores long-term well if protected from sun. Your storage capacity and facilities should influence what types and quantities of hay you can realistically store and preserve.

Final thought: hay is the foundation of everything in your horse's feeding program. Every dollar invested in quality hay saves you money elsewhere—in fewer digestive problems, better health, improved performance, and more efficient use of concentrate and supplements. Never view hay as something to economize on. It's your most important nutritional tool, and investing in quality hay is investing in your horse's long-term health.