Feeding Amounts

Many horse owners guess at feeding amounts or follow vague guidelines like "feed appropriate to condition." This imprecision leads to feeding too much and wasting expensive grain, or too little and having an underweight horse. Understanding how to calculate appropriate feed amounts for your specific horse, considering their weight, age, activity level, and body condition, takes the guesswork out of feeding. A properly fed horse receives adequate nutrition without excess, which is better for their health, their weight, and your wallet.

The foundation of calculating feed amounts is your horse's body weight. Most feeding guidelines are expressed as a percentage of body weight or as daily quantities for horses of specific weights. If you don't know your horse's weight, you can estimate it using a weight tape, a formula, or through visual assessment, then confirm it through a scale if available. Using an accurate weight is far better than guessing at amounts.

Different feeds have different recommendations based on their nutritional density. A maintenance feed might recommend 1-1.5 percent of body weight daily. A concentrate or grain might recommend 0.5-1 percent of body weight daily. A high-calorie performance feed might recommend 0.5-0.75 percent of body weight. These percentages are guidelines, not absolutes. Your individual horse might need more or less based on their metabolism, activity, and condition.

Activity level dramatically affects feed amounts needed. A horse in light riding needs less feed than a horse in heavy training. A horse on pasture grazing hay all day needs less supplemental feed than a stalled horse eating only provided hay. Understanding how much your horse moves and works helps determine grain requirements. A horse in light activity doing maybe two or three rides weekly needs significantly less grain than a horse in hard training five or six days weekly.

Body condition is the ultimate measure of whether you're feeding the right amount. A properly fed horse is neither too thin nor overweight—they maintain a body condition score of 4-6 on a nine-point scale. Too thin means you're underfeeding. Too heavy means you're overfeeding. Using body condition as your guide helps you adjust feeding amounts based on actual results rather than following rigid guidelines that might not be appropriate for your specific horse.

This article explains how to calculate feed amounts, how to adjust based on individual factors, how to use body condition to evaluate whether amounts are appropriate, and how to make feeding adjustments when your horse isn't maintaining proper condition on current amounts.

Basic nutrient requirements for horses are based on body weight and activity level. The National Research Council publishes detailed requirements for different horse types. A 1,000-pound horse at maintenance needs roughly 10,000-15,000 kilocalories of digestible energy daily. A 1,000-pound horse in light work needs roughly 15,000-18,000 kilocalories. A 1,000-pound horse in hard training needs 20,000-30,000 kilocalories or more. These are approximations, and individual horses vary, but they give you a starting point for understanding energy needs.

Protein requirements increase with work and growth. A 1,000-pound horse at maintenance needs roughly 600-750 grams of digestible protein daily. A horse in light work needs slightly more. A growing horse needs significantly more—20-24 percent crude protein during rapid growth. Understanding these requirements helps you choose feeds that meet them. A maintenance feed meeting basic requirements is different from a performance feed meeting higher demands.

Mineral requirements don't increase with work, but proper ratios matter. Calcium to phosphorus ratio should be roughly 2:1. Too much phosphorus relative to calcium causes problems. Too much calcium relative to phosphorus also causes problems. Most complete feeds are formulated to meet mineral requirements. If you're feeding a mixture of feeds or hay, confirm that mineral balance is appropriate. A horse eating primarily grass hay might have a mineral imbalance that needs supplement correction.

Vitamin requirements are met by quality hay and complete feeds. If you're feeding a complete feed, vitamin content is adequate. If you're feeding only hay and a concentrate, confirm that the concentrate provides adequate vitamins or supplement if needed. Vitamin A is particularly important if hay is old or poor quality because vitamin A content degrades in storage. A horse fed old hay might benefit from vitamin A supplementation.

Water needs increase with feed intake and work. A horse at maintenance needs roughly one gallon of water per 100 pounds of body weight, plus additional water based on hay intake and weather. A horse in work needs additional water. A horse sweating heavily during hot-weather work needs significantly more water. Providing unlimited access to clean water supports adequate hydration.

Start by determining your horse's actual weight. A weight tape, available at feed stores for ten to twenty dollars, gives you a rough weight estimate. Weigh tapes are less accurate than actual scales, but they're far better than guessing. Measure around your horse's barrel right behind the front legs, level with the ground, and note the tape reading. For more accuracy, use a scale if available. Many boarding facilities and veterinary clinics have scales. Knowing exact weight is worth the effort.

Determine your horse's activity level. Are they stalled most of the time with brief riding? Light activity. Are they turned out daily with occasional riding? Light to moderate activity. Are they in daily training? Heavy activity. Are they in competitive sport with multiple rides weekly? Very heavy activity. Honest assessment of activity prevents overestimating and overeeding grain.

Use feed bag recommendations as a starting point, not gospel. A feed bag recommends a quantity based on a generic 1,000-pound horse at a generic activity level. Your horse might need more or less. Read the recommendation, consider your horse's actual weight and activity, then adjust. A 1,200-pound horse needs about 20 percent more than recommended for a 1,000-pound horse. A very active horse might need 20-30 percent more than a light-activity horse.

Calculate daily feed amounts. A maintenance feed recommending 1 percent of body weight daily means a 1,000-pound horse should eat about ten pounds. A 1,200-pound horse should eat about twelve pounds. A grain recommending 0.5 percent of body weight means a 1,000-pound horse eating up to five pounds for light activity. Breaking this into twice-daily feedings means roughly two and a half to five pounds per meal depending on activity.

Combine hay and grain appropriately. Most horses should get forage as the primary diet—hay or pasture grass. Grain supplements forage based on activity and condition. A horse at maintenance might eat hay only. A horse in light activity might eat hay plus two to three pounds of grain daily. A horse in heavy training might eat hay plus eight to ten pounds of grain daily. The hay portion should be more than the grain portion.

Measure feed accurately. Use a scale or measuring cup, not eyeball estimates. Different feeds have different densities. What looks like a full scoop might vary by pounds depending on how tightly the scoop is packed. Measuring accurately prevents gradual overfeeding that creeps up without you noticing.

Adjust based on body condition. Check your horse's body condition regularly—weekly is good, at minimum monthly. Feel their ribs to assess whether you can feel them easily. Are they visible? Too thin. Can you barely feel them? Too heavy. You should be able to feel ribs with gentle pressure but they shouldn't be prominently visible. If your horse is getting too heavy, reduce feed slightly. If getting too thin, increase feed slightly. Make small adjustments and give a week or two to see the effect before adjusting again.

Keep records of what you're feeding and your horse's condition. Write down daily feed amounts and weekly body condition observations. Over time, this information tells you exactly how much your specific horse needs. This personal data is more accurate than generic guidelines.

Easy keepers maintain weight on significantly less feed than horses with normal metabolism. An easy keeper might maintain weight on hay only, or hay plus a minimal amount of grain. Feeding an easy keeper according to weight guidelines often results in overweight. Assess your easy keeper's individual needs and feed based on maintaining proper condition, not based on generic percentages. This typically means less feed than guidelines suggest.

Hard keepers need more feed than horses of similar weight and activity level. A hard keeper might need 20-30 percent more grain than a regular horse to maintain condition. Hard keepers sometimes benefit from higher-calorie feeds or added fat supplements because they need maximum calorie density. Feeding a hard keeper amounts based on standard guidelines results in weight loss. Assess condition regularly and increase amounts until your hard keeper maintains proper weight.

Performance horses need calories matching their work level. A performance horse doing intense work daily needs significantly more grain than a horse doing light riding. Feed according to work level rather than following standard guidelines. A horse training for events needs more feed during heavy training than during off-season. Adjust amounts based on actual work schedule.

Senior horses sometimes need more frequent smaller meals rather than larger meals, affecting how you portion daily amounts. A senior horse fed twice daily at normal amounts might do better on three smaller meals to reduce digestive stress. A senior hard keeper might need higher-calorie feed in smaller amounts more frequently. Adjust meal frequency and portion sizes to support older horses' digestive needs.

Breeding mares need increased feeding through pregnancy and lactation. A pregnant mare entering the final trimester needs 10-15 percent more calories than maintenance. A lactating mare needs 25-50 percent more calories than a non-pregnant mare of similar weight. Increase amounts appropriately and monitor condition. A mare nursing a foal needs aggressive feeding to maintain her own condition while producing milk.

Young horses being grown need careful attention to feeding amounts supporting growth without pushing growth too fast. A weanling needs higher protein and calories than an adult maintenance horse but shouldn't be overfed causing developmental problems. A growing horse should put on weight gradually—a pound per day is reasonable—not excessively fast. Feed according to age-appropriate recommendations rather than adult horse amounts.

One major mistake is overfeeding grain and creating overweight horses. Overeating is rarer in horses than undereating, but easy keepers eating standard amounts for their weight often become overweight. Overweight horses have increased disease risk and reduced athletic ability. Feeding amounts appropriate to your horse's actual body condition is more important than following generic guidelines.

Another issue is feeding inadequate amounts and having an underweight horse. Some owners, particularly those new to horses, underfeed through fear of overfeeding or lack of understanding of actual needs. An underweight horse shows ribs prominently, lacks muscle definition, and is at higher disease risk. Assessing your horse's condition regularly prevents extended periods of inadequate feeding.

Not accounting for activity level changes is another mistake. A horse training for events needs more feed during heavy training than during quiet off-season. Keeping amounts static year-round when activity changes means overfeeding in quiet seasons and underfeeding during heavy activity. Adjust amounts when activity changes.

Feeding inconsistent amounts day to day creates digestive stress. A horse expects feeding amounts to be consistent. Feeding ten pounds one day and twelve pounds the next confuses the digestive system. Measure consistently and maintain stable amounts. If adjustment is needed, make the change gradually over several days.

Not accounting for seasonal changes is another issue. Access to fresh spring grass changes calorie intake dramatically. A horse on good pasture needs less supplemental feed. The same horse in winter on only hay needs more grain. Some owners don't adjust amounts seasonally and their horses gain weight in spring then get thin in winter. Adjust supplemental feed based on forage availability.

Invest in a scale or weight tape to know your horse's actual weight. This single piece of information makes all feeding calculations accurate. Without knowing weight, you're guessing at everything.

Use a measuring cup or small scale for grain portions. A one-pound margarine container holds roughly one pound of most grains. A small kitchen scale that weighs in pounds helps measure precisely. Measuring takes an extra minute but removes guesswork.

Plan feeding amounts for the entire week or month. Calculate what your horse should eat, organize your feed supply accordingly, and stick to the plan. Planning prevents gradual creep of amounts without you noticing.

Assess body condition regularly. Weekly assessments catch changes quickly. Monthly is minimum. Standing behind your horse looking at topline, feeling ribs, evaluating overall shape takes a minute but gives you crucial feedback about whether amounts are appropriate.

Keep notes over time. Eventually you know exactly how much your specific horse needs. This personal knowledge is more valuable than any guideline. A horse that maintains ideal condition on eight pounds of grain at a certain activity level might always need that amount at that activity. Your records document this.

Adjust slowly when changes are needed. If your horse is getting too heavy, reduce by 10-15 percent and wait a week to see effect. If getting too thin, increase by 10-15 percent. Small adjustments prevent overcorrection. Most horses respond within a few weeks to feeding adjustment.