Horse Grain 101: When to Feed It (And When to Skip It)

When it comes to feeding horses, one of the most common questions horse owners ask is whether their equine companions actually need grain.

The short answer: Not always.

While grain can be helpful for specific horses – such as those with high energy demands or difficulty maintaining weight – many do perfectly well on a balanced, forage based diet alone.

The key is understanding your horse’s individual nutritional needs, workload, and health status before deciding whether grain belongs in their feeding program.

Understanding the Horse’s Digestive System

Horses are natural grazers that are built to consume small, frequent meals of fibrous plants throughout the day.

• Their digestive systems are designed for steady forage intake – not large portions of concentrated feed.
• In the wild, horses spend up to 16 hours each day grazing on grasses and other vegetation.
• The equine digestive tract features a large cecum and colon filled with beneficial microbes that ferment and break down fiber. This system allows horses to extract ample nutrients from hay and pasture alone, making grain supplementation unnecessary for many individuals.

When Horses Don’t Need Grain

Many companion and leisure horses thrive on forage only diets. If your horse fits one or more of the following categories, grain may not be needed:

• Easy Keepers: Horses that maintain a healthy body condition on hay or pasture alone don’t need extra calories from grain. They efficiently convert forage into energy and body fat.

• Lightly Worked or Retired Horses: Horses in minimal exercise – such as light trail riders or retired companions – usually meet all of their nutritional needs through high quality hay and pasture.

• Horses With Metabolic Conditions: Those diagnosed with insulin resistance, Equine Metabolic Syndrome (EMS), or prone to laminitis often benefit from low starch, forage based diets. High sugar and starch levels in grain can worsen these conditions.

When Grain Becomes Beneficial

While many horses do well on forage alone, some situations call for added grain to meet higher energy or nutrient demands. Grain can provide concentrated calories, protein, and essential vitamins when forage isn’t enough.

• Horses in Harsh Climates: During cold weather, horses expend extra energy maintaining body heat. Adding grain can help sustain body condition and energy levels through extreme temperatures.

• Performance and Working Horses: Horses in regular training, competition, or demanding farm work burn significant energy and often need grain to maintain weight and performance. Those working intensively several days a week typically require additional calories beyond what forage can supply.

• Growing Horses: Weanlings, yearlings, and young horses that are still growing have higher nutritional needs for proper growth. Specialized grain formulations for developing horses provide balanced protein, minerals, and calories.

• Underweight or Hard Keeping Horses: Horses that struggle to hold weight on forage alone may benefit from the concentrated calories in grain. This also applies to senior horses with dental problems that make hay difficult to chew.

• Pregnant and Lactating Mares: Late gestation and nursing mares require increased calories, protein, and minerals. Grain can help meet these heightened nutritional demands during reproduction and milk production.

• Senior Horses: Older horses often have difficulty chewing or digesting coarse hay. Senior feeds – typically grain based and designed to be soaked – offer easily digestible nutrition.

Quality Forage: The Cornerstone of a Healthy Diet

Whether or not you feed grain, high quality forage should always form the bulk of a horse’s diet.

Horses need at least 1.5% to 2% of their body weight in forage daily – about 15 to 20 pounds for a 1,000 pound horse. This is a general guideline, and individual horses may need more or less depending on their age, activity level, and metabolism.

Good quality hay should be:

• Free from dust, mold, and weeds
• Green in color, rather than brown or yellow
• Leafy with minimal stems
• Fresh smelling, without musty or off odors
• Harvested at the right maturity for optimal nutrition

Pasture Considerations

Pasture quality can vary by season and region. Spring grasses are nutrient dense and high in calories, while summer and winter pastures often provide less nutrition. Many horses can maintain excellent condition on pasture alone during peak growing seasons.

Risks of Overfeeding Grain

Feeding grain when it’s not needed can lead to several serious health and behavioral issues:

• Obesity: One of the most common problems in domestic horses. Excess grain contributes to unhealthy weight gain, increasing the risk of laminitis, metabolic disorders, and joint strain.

• Digestive Upset and Colic: Horses’ digestive systems are sensitive to sudden dietary changes and high grain intake, which can trigger potentially life-threatening colic.

• Behavioral Change: High grain diets can lead to hyperactivity and excitability. The term “hot” used for energetic horses often relates to grain induced behavior.

• Metabolic Disorders: Long term consumption of high starch diets can promote insulin resistance and other metabolic issues.

• Hoof Problems: Excess sugars and starches from grain are strongly linked to laminitis and other hoof related conditions.

How to Assess Your Horse’s Needs

Evaluating whether your horse requires grain involves a careful, honest assessment of several factors:

• Body Condition Scoring: Use a standardized 1 to 9 scale to evaluate body fat and overall condition. An ideal score is usually around 5 – their ribs should be easily felt but not visible. Horses scoring below 4 may need additional calories.

• Workload Assessment: Consider the frequency, intensity, and duration of exercise. Light recreational riding differs greatly from daily training or competitive work.

• Age and Life Stage: Nutritional needs vary with age. Growing horses, seniors, and mature adults all have distinct requirements.

• Health Status: Dental health, metabolic conditions, and overall wellness directly impact dietary needs. Regular veterinary and dental check-ups help ensure your feeding plan supports your horse’s health.

• Forage Quality and Availability: The nutritional value of hay or pasture affects whether grain supplementation is necessary. Periodically test forage to gauge its quality.

Making Dietary Changes Safely

1. Introduce Grain Carefully: Start with small amounts, increasing slowly while observing for signs of digestive discomfort or behavioral changes.

2. Transition Gradually: Any introduction or removal of grain should occur over 7 to 10 days to avoid digestive upset.

3. Monitor Body Condition: When reducing grain, some horses may initially lose weight before adapting to a forage only diet.

The Bottom Line

Most horses do not require grain if they maintain a healthy body condition on high quality forage. The decision to supplement with grain should be based on a careful evaluation of your horse’s workload, age, body condition, and overall health – not on tradition or assumption.

When in doubt, consult with an equine nutritionist or veterinarian who can evaluate your specific horse and make personalized recommendations. Regular body condition scoring and ongoing health monitoring help ensure your feeding program meets your horse’s changing needs throughout their life.

Remember that every horse is unique. What works for one may not suit another, even within the same breed or discipline. Stay observant, flexible, and ready to adjust your feeding plan as your horse’s requirements evolve.

Feeding Horses Grain FAQ

Can horses survive on hay alone? 

Yes – Many horses can thrive on quality hay or pasture without any grain supplementation, provided the forage meets their nutritional needs.

What are signs my horse needs more feed? 

Visible ribs, prominent hip bones, lack of muscle, dull coat, low energy, and body condition score below 4 indicate insufficient nutrition.

Is oatmeal better than commercial feed? 

Oats alone lack balanced nutrition. Commercial feeds formulated for horses provide appropriate vitamin and mineral balance along with calories.

Can too much grain harm my horse? 

Yes – Excessive grain causes obesity, metabolic problems, laminitis, colic, and behavioral issues. Feed only what your horse truly needs.