Introduction to Equine Nutrition
Proper nutrition is vital for your horse's health, performance, and longevity. Horses are herbivores with a digestive system designed for continuous grazing. Understanding their dietary needs helps prevent colic, laminitis, and other health issues. This guide covers recommended diets, portion sizes, feeding schedules, essential nutrients, and more.
Recommended Diet Types
Pasture and Hay (Forage)
Forage should be the foundation of every horse's diet, making up at least 50-70% of their daily intake. Good quality hay (timothy, orchard grass, or alfalfa) provides necessary fiber for gut health. Pasture grazing is ideal but must be managed to prevent overconsumption of lush grass.
Grain and Concentrates
Grains (oats, corn, barley) and commercial concentrates provide energy and protein for active horses. Choose feeds formulated for your horse's life stage and workload. Avoid high-starch diets, as they can lead to metabolic disorders.
Balanced Complete Feeds
Complete feeds contain forage and concentrates in one pellet, convenient for horses with limited access to hay. Ensure they meet AAFCO standards for horses.
Portion Sizes and Daily Calorie Needs
Feed quantities depend on the horse's body weight, age, activity level, and metabolism. Use the table below as a general guide.
| Horse Type | Body Weight (lbs) | Daily Hay (lbs) | Concentrate (lbs) | Calories (Mcal/day) |
|---|---|---|---|---|
| Maintenance (idle adult) | 1000 | 15-20 | 0-5 | 16-18 |
| Light work | 1000 | 15-20 | 4-6 | 20-22 |
| Moderate work | 1000 | 15-20 | 6-8 | 22-25 |
| Heavy work | 1000 | 15-20 | 8-12 | 25-30 |
| Pregnant mare (last trimester) | 1100 | 18-22 | 6-10 | 22-26 |
| Lactating mare | 1100 | 20-25 | 10-15 | 28-32 |
| Weanling (6 months) | 400 | 4-8 | 4-6 | 10-14 |
| Yearling | 700 | 10-14 | 4-8 | 14-18 |
Adjust portions based on body condition score (BCS). Horses should maintain a BCS of 5-6 on a 9-point scale.
Feeding Frequency and Schedule
Horses are natural grazers; feed multiple small meals rather than one or two large ones. Ideal schedule:
- Morning: Hay (1/3 of daily forage) and concentrate if needed.
- Midday: Hay only (1/3).
- Evening: Hay (1/3) and second concentrate meal if applicable.
- Late night: Optional small hay portion to extend grazing time.
Always provide constant access to clean water, and avoid feeding within one hour before or after exercise to reduce colic risk.
Essential Nutrients
Protein
Required for muscle development, repair, and coat quality. Growing horses and lactating mares need 14-16% crude protein; adult maintenance needs 10-12%. Quality sources include alfalfa hay, soybean meal, and linseed.
Fats
Fats provide concentrated energy (2.25 times more than carbs) and improve coat shine. Include 3-6% of diet; add vegetable oil (corn, soybean) or stabilized rice bran.
Carbohydrates
Fiber (from forage) is essential for hindgut fermentation. Non-structural carbs (starches, sugars) should be limited, especially for easy keepers.
Vitamins and Minerals
Vitamins A, D, E, and B-complex are crucial. Minerals include calcium, phosphorus (ratio 2:1 for adults), magnesium, potassium, selenium, and zinc. Provide a balanced mineral supplement if hay lacks variety.
Toxic and Harmful Foods
Never feed horses:
- Chocolate: Contains theobromine, toxic.
- Avocado: Toxic to horses.
- Onions and garlic (in large amounts): Can cause anemia.
- Potatoes and tomato stems: Solanine poisoning.
- Moldy hay or grains: Mycotoxin risk.
- Lawn clippings: Can cause colic or laminitis.
- Large amounts of grain: Overeating can lead to colic and founder.
Water Requirements
Horses drink 5-15 gallons per day depending on temperature, activity, and diet. Provide fresh, clean water at all times. In winter, ensure water is not frozen. Increased water intake helps prevent impaction colic.
Beneficial Supplements
Consult a veterinarian before adding supplements. Common beneficial options:
- Probiotics: Support gut health during stress or antibiotic use.
- Joint supplements: Glucosamine, chondroitin, and MSK for older or working horses.
- Electrolytes: Replace lost minerals in hot weather or heavy exercise.
- Vitamin E and selenium: Antioxidants; especially for horses not on pasture.
Feeding Differences by Life Stage
Foals and Weanlings
Foals nurse from dam; start creep feeding (small amounts of grain) at 2-3 months. Weanlings need high-quality protein (14-18%), calcium, and phosphorus for bone growth. Feed three to four times daily.
Adult Horses
Maintain body condition with forage-based diet. Adjust concentrate according to workload. Monitor weight and mental state.
Senior Horses
Older horses may have dental issues; provide soaked hay cubes, beet pulp, or senior feeds. Increase protein (14-16%) to preserve muscle mass. Add digestive aids and joint supplements as needed.
Signs of Healthy vs. Poor Diet
Healthy indicators: Shiny coat, bright eyes, good muscle tone, regular manure, calm demeanor, and appropriate body condition.
Poor diet signs: Dull hair coat, weight loss or gain, lethargy, diarrhea or constipation, hoof problems, and behavioral issues like cribbing or aggression.
Regularly assess body condition and consult a vet or equine nutritionist to adjust feeding regimens. A balanced diet ensures your horse lives a long, active, and happy life.