Hay First, Everything Else Second
If there's one principle that should guide everything about feeding horses, it's this: forage is the foundation. A horse's digestive system evolved over millions of years to process fibrous plant material almost continuously. Hay, pasture, and other forage should make up at least 1.5-2% of your horse's body weight daily - that's 15-20 pounds of forage for a 1,000-pound horse. Every day. Without exception.
I've seen well-meaning horse owners pour money into expensive grain supplements while feeding mediocre hay, and it's completely backwards. Get the hay right first. For many horses, especially those in light work or at maintenance, good-quality hay might be all they need. Everything else is supplemental.
Understanding Hay Quality
Not all hay is created equal, and the differences matter enormously for your horse's health, weight, and performance.
Visual Assessment
Before you even think about hay analysis (we'll get there), you can learn a lot just by looking at and smelling hay:
- Color - Good hay is green to light green. Yellow or brown hay has been sun-bleached or rained on, losing nutritional value. Avoid very dark or black patches, which may indicate mold.
- Smell - Fresh, sweet, slightly grassy smell is what you want. Musty, sour, or ammonia-like smells indicate mold or fermentation. Never feed moldy hay - it can cause colic and respiratory disease.
- Texture - Soft and leafy is more nutritious than coarse and stemmy. Leaf content is where most of the protein and calories live.
- Dust - Shake a flake and check for dust clouds. Excessive dust irritates respiratory systems and may indicate mold spores.
- Maturity at cutting - Hay cut early (before heavy seed head development) is more nutritious and digestible than hay cut late. Late-cut hay is stemmier and higher in fiber but lower in protein and energy.
Hay Analysis: Worth Every Penny
For $20-30, you can send a hay sample to a forage testing lab and get a detailed nutritional breakdown. This is the single best investment you can make in your feeding program. You're guessing without it.
Key values to look at:
- Crude protein - Maintenance horses need 8-10%. Performance horses need 10-14%. Lactating mares need 12-14%.
- ADF (Acid Detergent Fiber) - Higher ADF means less digestible. Aim for under 35% for good quality hay.
- NDF (Neutral Detergent Fiber) - Affects intake. Above 65% NDF and horses may not eat enough to meet their needs.
- DE (Digestible Energy) - How many calories per pound. Measured in Mcal/lb.
- NSC (Non-Structural Carbohydrates) - Sugar and starch content. Important for metabolic horses, insulin-resistant horses, and those prone to laminitis. Below 10-12% NSC is recommended for these horses.
- Minerals - Calcium, phosphorus, and their ratio. The calcium-to-phosphorus ratio should be between 1:1 and 2:1. Inverted ratios (more phosphorus than calcium) can cause skeletal problems.
Types of Hay for Horses
Grass Hay
Timothy, orchardgrass, bermudagrass, brome - these are the workhorses (pun intended) of equine nutrition. Grass hay is lower in calories and protein than legume hay, making it appropriate for the majority of horses.
- Best for: Easy keepers, overweight horses, horses at maintenance or light work, metabolic horses
- Typical protein: 8-12%
- Typical DE: 0.8-1.0 Mcal/lb
Legume Hay (Alfalfa)
Alfalfa is higher in protein, calories, and calcium than grass hay. It's a valuable feed but needs to be used appropriately.
- Best for: Hard-working horses, growing youngsters, lactating mares, underweight horses needing to gain condition
- Typical protein: 15-22%
- Typical DE: 1.0-1.2 Mcal/lb
- Caution: Too much alfalfa for idle horses leads to obesity and can cause enterolith formation (intestinal stones) in some regions
Mixed Hay
A grass-alfalfa mix gives you the best of both worlds - higher quality than straight grass hay without the intensity of pure alfalfa. Many horse owners find a 50/50 or 70/30 grass/alfalfa mix hits the sweet spot for horses in moderate work.
When Does Your Horse Need Grain?
This is where things get interesting, because the honest answer for a lot of horse owners is: your horse might not need grain at all.
Horses That Usually Need Grain
- Performance horses in moderate to heavy work - Their caloric needs exceed what hay alone can provide
- Growing horses (weanlings, yearlings) - Need extra calories, protein, and specific nutrients for proper development
- Lactating mares - Milk production has enormous energy demands
- Hard keepers - Horses that struggle to maintain weight on hay alone
- Senior horses with dental issues - May not be able to chew hay effectively and need alternatives
Horses That Often Don't Need Grain
- Easy keepers at maintenance or light work
- Overweight horses (grain just adds unnecessary calories)
- Horses with metabolic syndrome or insulin resistance (grain starches worsen these conditions)
- Most pleasure and trail horses getting adequate quality hay
If your horse maintains good body condition (Henneke score 5-6) on hay alone, a ration balancer (low-calorie vitamin/mineral supplement) may be all you need to fill nutritional gaps without adding unnecessary calories.
Understanding Grain and Concentrate Options
Commercial Feeds
Modern commercial horse feeds are formulated to complement forage. They come in various categories:
- Ration balancers - Low-calorie, high-nutrition. Provides vitamins, minerals, and protein without extra calories. Fed at 1-2 pounds per day. Ideal for easy keepers on hay-only diets.
- Performance feeds - Higher calorie formulations for horses in work. Typically 12-14% protein with added fat and controlled starch.
- Senior feeds - Designed for older horses, often with softer texture and higher fiber for compromised dentition. Can be soaked into a mash.
- Growth formulas - Balanced for young, growing horses with appropriate protein, mineral, and energy ratios.
Straight Grains
Oats, corn, barley - these traditional grains are still used but require more nutritional knowledge to feed correctly because they don't provide a balanced vitamin and mineral profile on their own.
- Oats - The safest straight grain for horses. Lower starch than corn, less likely to cause digestive upset. Still needs mineral supplementation.
- Corn - Very calorie-dense but high in starch. Overfeed corn and you're asking for digestive problems, founder risk, and hot behavior.
- Barley - Moderate energy. Should be processed (crimped or rolled) for better digestibility.
Feeding Principles That Prevent Problems
Rule 1: Feed by Weight, Not Volume
A coffee can of oats weighs very differently than a coffee can of pelleted feed. Weigh your feed. A kitchen scale or a small hanging scale in the feed room eliminates guessing and prevents overfeeding or underfeeding.
Rule 2: Make Changes Slowly
The horse's hindgut relies on microbial populations that adapt slowly to dietary changes. Switching feed types abruptly can cause colic and diarrhea. Any feed change should happen gradually over 7-14 days, mixing increasing amounts of the new feed with decreasing amounts of the old.
Rule 3: Small Meals, Frequent Feedings
Horses have small stomachs relative to their body size. Large grain meals overwhelm digestive capacity and push undigested starch into the hindgut, causing dangerous fermentation. Never feed more than 5 pounds of grain in a single meal. If your horse needs more, split into 3 or more feedings per day.
Rule 4: Forage Before Grain
Feeding hay before grain slows the passage of grain through the digestive system, improving nutrient absorption and reducing the risk of hindgut acidosis. It also provides a fiber mat in the stomach that buffers gastric acid.
Rule 5: Water and Salt Always
Clean water available 24/7 and free-choice salt are non-negotiable components of equine nutrition. Dehydration and electrolyte imbalances cause colic, poor performance, and metabolic dysfunction.
Body Condition Scoring: Your Feedback Tool
The Henneke Body Condition Scoring system rates horses from 1 (emaciated) to 9 (obese) by evaluating fat cover over six body areas: neck, withers, behind the shoulder, ribs, loin, and tailhead.
Your target is generally a 5 (moderate) to 6 (moderately fleshy). At a score of 5, ribs are easily felt but not seen, and there's a slight fat cover over the back and loin. Learn this scoring system and evaluate your horse monthly. It's the most honest feedback tool for whether your feeding program is working.