Grain and Concentrates

Grain and concentrate feeds are energy-dense supplements meant to supplement forage for horses that need extra calories. They're not required for every horse—many horses maintain excellent health and condition on forage alone. But for performance horses, hard keepers, and horses doing significant work, grain provides calorie density that forage alone can't match. The key is understanding that grain is supplemental, not foundational. Forage provides the bulk of nutrition, calories, and digestive health benefits. Grain enhances that foundation for horses needing additional energy.

The confusion around grain comes from treating it as a primary food rather than a supplement. Many people fed horses first established feeding grain as the default, then added forage. The modern understanding is reversed—forage is the foundation, grain is supplemental. This shift changes how much grain horses actually need. A horse with good forage doesn't need much grain for maintenance. Only when work demands or individual metabolism require additional calories does grain become necessary in significant amounts.

Grain types vary significantly in nutritional content and appropriate usage. Oats are relatively safe and palatable. Barley is more calorie-dense and higher in starch. Corn is energy-dense but often unnecessary even for performance horses. Beet pulp is lower-starch alternative. Mixed grain products vary tremendously depending on formulation. Understanding the differences lets you choose grain appropriate for your horse's needs rather than defaulting to whatever is cheapest or most available.

The risks of overfeeding grain are real and often underestimated. Excessive grain causes colic, ulcers, laminitis risk in susceptible horses, behavior problems, and obesity in easy keepers. Many feeding problems that get attributed to other causes actually stem from grain overfeeding. A horse fed what the owner thinks is appropriate often is actually receiving two to three times what the horse needs. Reading the science on actual grain requirements prevents this common mistake.

This guide covers different grain types and their nutritional profiles, how to calculate appropriate grain amounts based on work and individual needs, risks of grain overfeeding, and how to integrate grain appropriately into a forage-first feeding program. You'll learn to read grain labels, understand caloric content, and make decisions about whether grain is necessary for your horse or just a habit. The goal is using grain strategically when it genuinely helps, and avoiding unnecessary feeding that creates problems.

Oats are the traditional grain for horses and remain a good choice because they're relatively safe and palatable. Oats contain roughly 10-12 percent protein and 50 percent starch, with a higher fiber content than other grains. This composition makes oats a moderate-risk grain choice—they provide calories without the starch intensity of corn or barley. A horse can usually handle more oats without digestive trouble than equivalent amounts of corn. Oats are also less likely to cause metabolic problems in susceptible horses, though they still aren't appropriate in large amounts for insulin-resistant horses.

Barley is more calorie-dense than oats but also higher in starch at 55-60 percent. Barley provides more energy per pound than oats, which appeals to people wanting to feed smaller volumes. However, the higher starch content means greater digestive load per pound fed. Barley also tends to be less palatable than oats, though most horses eat it. The increased energy density makes barley attractive for hard keepers needing maximum calories in moderate volume, but appropriate for most maintenance horses is much less than for performance horses.

Corn is the most energy-dense grain at roughly 70 percent starch and 1.3-1.4 megacalories per pound. This high energy density makes corn appealing for horses needing serious calorie supplementation. However, corn's starch content is problematic for many horses. It's more likely to cause colic and digestive upset than oats. It's riskier for metabolically sensitive horses. For a performance horse doing high-level work where calorie needs genuinely require dense supplementation, small amounts of corn might be appropriate. For most horses, corn is more grain than necessary and creates risk without proportional benefit.

Beet pulp is lower in starch (roughly 20 percent) and higher in fiber than traditional grains, making it a safer energy source for metabolically sensitive horses. Beet pulp doesn't ferment as dramatically in the hindgut as grain starches, so it's less likely to cause colic or severe pH shifts. The trade-off is that beet pulp is less energy-dense than grain, so you feed more pounds to get equivalent calories. For a horse that can't handle grain safely, beet pulp provides an alternative calorie source. Soaking beet pulp before feeding is necessary for palatability and safety.

Mixed grain products vary from simple oats-and-barley blends to complex formulations with added supplements. Reading the ingredient list tells you what's in it. Understanding the guaranteed analysis (percentages of protein, fat, fiber, and ash) lets you evaluate whether the product matches your horse's needs. Products claiming to be "complete" might still require forage and additional minerals. Products with multiple added supplements might be addressing nutritional gaps that better forage wouldn't require. Evaluate each product based on its actual composition and your horse's actual needs.

Protein content in grain ranges from roughly 10-16 percent depending on the grain type and formulation. Most horses doing light to moderate work get adequate protein from good forage alone. Performance horses or growing horses might need supplemental protein, which some grain products include. However, just because protein is included doesn't mean the amount is appropriate for your horse. Calculate total protein intake from forage plus grain to ensure it meets (but doesn't exceed) actual requirements.

The most common feeding error is overestimating how much grain horses actually need. Most horses in light work require minimal grain supplementation if forage is adequate. A horse doing light trail riding or casual riding might maintain fine on forage alone. Even a horse doing moderate work—regular riding, some arena work, light training—might not need grain if forage quality is excellent and the horse's metabolism handles it. The question to ask is: does my horse maintain appropriate weight and condition on forage alone? If yes, grain is unnecessary.

For horses that do need grain, calculate amounts based on work level and individual metabolism. A general guideline is 0.5 to 1 percent of body weight in grain daily for horses doing moderate work. That's 5-10 pounds for a 1000-pound horse. For performance horses doing higher-level work, 1-2 percent might be appropriate (10-20 pounds). For horses maintaining on forage alone, zero grain is appropriate. These are general guidelines—individual horses vary. Monitor body condition and adjust based on how your specific horse responds.

Feeding multiple smaller meals is safer than single large meals, particularly with grain. The horse's stomach is small relative to body size and has limited capacity. A single feeding of 10 pounds of grain puts much of the digestive load on the foregut with incomplete digestion occurring in the small intestine, leading to fermentation problems. Two meals of 5 pounds each distributes the load and improves digestion. Three meals is even better. If your schedule allows, splitting grain across multiple feedings prevents many grain-related digestive problems.

Introducing grain changes requires gradual transition. If a horse has been on forage only and you start grain feeding, introduce grain slowly over a week to ten days, allowing hindgut bacteria to adapt to the new starch load. Similarly, if you change grain types, transition slowly. Even switching from one brand of oats to another should be done gradually. This slow transition prevents colic and digestive upset that abrupt changes cause.

Water requirements increase with grain feeding. Grain is less water-rich than forage and requires water for digestion. A horse eating significant grain needs constant access to clean water. Dehydration makes impaction colic risk higher with grain feeding. Ensure water is always available, even during feeding. Some horses drink more readily from familiar water sources or at certain times—understand your horse's drinking patterns and accommodate them.

Easy keepers rarely need grain. These horses maintain or gain weight on forage alone. Feeding grain to an easy keeper often causes unwanted weight gain, contributing to metabolic issues and expense without benefit. If an easy keeper needs supplemental calories for work, small amounts of grain might be appropriate, but it's important to recognize that these horses often maintain fine on forage plus minimal supplementation. Many easy keepers thrive on good forage alone, with no grain at all.

Hard keepers genuinely need grain supplementation. These horses struggle to maintain weight on forage alone, even with generous quantities. Grain provides calorie density that allows them to maintain condition on reasonable total feed quantities. For a chronic hard keeper, grain becomes necessary management rather than optional supplementation. The amount varies by individual, but hard keepers often need grain to maintain appropriate weight and health. Choosing appropriate grain (less starchy for metabolically sensitive hard keepers, more calorie-dense for those tolerating it well) helps manage their condition.

Performance horses have variable grain needs depending on work intensity. A horse doing casual riding might maintain on forage alone. A horse doing regular performance training or competition often benefits from grain to support the energy demands of work. High-level performance horses doing intensive training and competition usually need grain to maintain the condition required for their level of work. Matching grain amount to actual work level prevents both underfeeding (poor performance, weight loss) and overfeeding (digestive problems, metabolic stress).

Senior horses might need grain if dental issues make chewing hay difficult or if weight maintenance becomes challenging with aging. Good quality, soft hay remains essential, but grain can supplement when the horse can't eat enough hay volume due to dental limitations. As horses age, metabolic efficiency sometimes decreases, and modest grain supplementation helps maintain weight that forage alone doesn't support. Assess each senior individually and adjust based on their specific needs.

Young growing horses have higher nutritional demands than adults, particularly for protein and minerals supporting bone growth. Growing horses sometimes benefit from supplemental grain (or complete feeds formulated for growth) beyond what forage provides. However, overfeeding grain to growing horses creates problems—the explosive growth comes at the cost of skeletal soundness issues. Moderate, balanced supplementation supports healthy growth without accelerating growth so rapidly that the skeleton can't support it properly.

Grain overfeeding is the most common grain-related problem. A horse owner believes they're feeding an appropriate amount, but the horse is actually receiving far more grain than needed. This happens because recommendations are generic rather than calculated for the individual horse. A 1000-pound horse in light work needs maybe 5 pounds of grain; a similar horse in heavy work might need 10-15 pounds. Without doing the calculation, it's easy to feed 20 pounds "to be safe." Over time, overfeeding causes weight gain, digestive issues, and metabolic stress.

Colic from grain overfeeding is a serious risk. Excessive grain overwhelms the small intestine's digestive capacity, allowing starch to pass into the hindgut where fermentation causes problems. The result is colic ranging from mild to severe. Some episodes resolve with conservative treatment; others require veterinary intervention. Some result in serious complications or death. Colic from overfeeding grain is entirely preventable through appropriate grain amounts and feeding frequency.

Ulcers develop more commonly in grain-fed horses, particularly those on high-grain diets. The mechanism is complex but involves increased hindgut fermentation creating acid conditions. Horses with grain-related ulcers often show behavior problems (irritability, bucking, reluctance to work) that improve dramatically once grain is reduced and appropriate forage intake restored. If your horse shows behavior changes or performance problems, ulcers from grain overfeeding should be considered as a potential cause.

Metabolic issues in susceptible horses worsen with grain feeding. Horses with insulin resistance or metabolic syndrome eating high amounts of grain often develop or worsen metabolic dysfunction, increased laminitis risk, and weight management problems. These horses need low-grain, low-NSC feeding strategies. Even for horses without obvious metabolic issues, excessive grain is problematic long-term.

Dependency on grain develops when horses become accustomed to grain feeding and seem demanding about it, and owners respond by feeding more. The horse might develop stereotypic behaviors, fence walking at feeding time, or other vices seemingly driven by grain anticipation. The actual cause is excessive grain creating metabolic and digestive stress that increases anxiety. Reducing grain often dramatically improves behavior, though the initial transition period (usually one to two weeks) can show increased vice as the horse withdraws from the grain-driven stress response.

Calculate grain needs for your specific horse rather than defaulting to arbitrary amounts. Consider: What's my horse's weight? What's my horse's work level? Is my horse maintaining appropriate condition on current feeding? Am I trying to gain or maintain? Use these answers to calculate reasonable grain amounts, then monitor body condition and adjust. For most horses, the calculated amount is less than the owner was feeding.

Read grain labels and understand what you're buying. The guaranteed analysis tells you protein, fat, and fiber percentages. The ingredient list tells you what's actually in it. A product listing corn as the first ingredient is very different from one listing oats as the first ingredient. Many products contain more fillers, supplements, and questionable ingredients than you might expect. Higher quality grains cost more but deliver better nutrition with fewer problematic additions.

Consider whether your horse actually needs commercial grain at all. Straight oats purchased in bulk from a feed mill often cost less than commercial mixed grain products, contain no additives, and serve most horses well. If you're not sure whether grain is necessary for your horse, try removing it for a month and monitor body condition. Most horses maintain fine, and you save money and potential digestive problems. If your horse does lose weight, you've confirmed grain is necessary; if not, you've identified that forage alone is sufficient.

Avoid the temptation to increase grain to solve training or behavior problems. More grain rarely improves behavior; it usually makes it worse by increasing metabolic stress and anxiety. If your horse has behavior issues, address underlying causes—training, management, forage adequacy, dental health—rather than throwing more grain at the problem. A grain-fed horse isn't a better horse; it's often a more stressed horse.

Work with your veterinarian on grain-related digestive problems. If your horse is colicky, having ulcer symptoms, or showing signs of metabolic stress, grain amount and type should be addressed. Your vet can help you calculate appropriate amounts based on your horse's condition and work level, adjust grain types if necessary, and rule out other causes of problems that grain feeding might be masking.

Grain is supplemental, not foundational. Forage is the base of every horse's diet. Grain adds calories and sometimes nutrients for horses that need it. Many horses maintain health and condition on forage alone. Calculate whether your horse actually needs grain before assuming supplementation is necessary.

Grain type matters less than amount for most horses. Oats are a safe, traditional choice. Barley provides more calories per pound but higher starch. Corn is very energy-dense but higher-risk. For metabolically sensitive horses, even lower-starch options like beet pulp might be safer than traditional grains. Match grain type and amount to your horse's metabolic status, work level, and individual needs.

Overfeeding grain causes more problems than underfeeding. The risk of colic, ulcers, metabolic stress, and behavior issues from excess grain far exceeds any benefit of an extra few pounds. Calculating appropriate amounts and being disciplined about not exceeding them prevents digestive and metabolic problems. A horse receiving 10 pounds of grain when it needs 5 is headed for problems that are entirely preventable.

Multiple small meals are safer than large single feedings. Splitting grain across two or three feedings distributes digestive load and improves digestion. The effort of additional feedings prevents colic and digestive upset. If your schedule allows more than one feeding daily, your horse's digestive health improves—another reason that single-meal feeding should be avoided when possible.