A complete step-by-step guide to understanding every section — ingredient list, guaranteed analysis, NSC, ADF, NDF, selenium, vitamins, and what each number actually means for your horse.
📷 Decode any label instantlyStart here, not with the front of the bag. The ingredient list on the back or side panel tells you what the feed is actually made of. By law in the United States, ingredients must be listed in descending order by weight before processing — the first ingredient is present in the largest amount, and each subsequent ingredient is smaller than the one before it.
The first three ingredients define the character of the feed. They represent the bulk of what your horse is eating.
Ingredient position matters most for sugar sources. If molasses appears at position #2 or #3, it is a major ingredient. If it appears at position #10 or later, it is a small palatability addition. The same ingredient can be a concern or a non-issue depending on its position.
Horse feeds provide energy through three pathways, each with a very different effect on the horse's body:
| Energy Source | Ingredients to Look For | Effect | Suitable For |
|---|---|---|---|
| Digestible Fiber | Beet pulp, soybean hulls, alfalfa, timothy pellets, wheat middlings | Fermented slowly in hindgut → produces VFAs → steady sustained energy, minimal insulin spike | All horses, especially metabolic horses, easy keepers, seniors |
| Grain Starch | Corn, oats, barley, wheat, wheat middlings (when leading) | Digested quickly in small intestine → raises blood glucose → significant insulin response | Horses in heavy work needing quick energy — NOT metabolic horses |
| Fat | Vegetable oil, soybean oil, rice bran, flaxseed, stabilized fat supplements | 2.25× more energy per gram than carbohydrates — no blood glucose spike | Hard keepers, performance horses, horses that need calories without starch |
The most useful question: is the first ingredient fiber or grain? That single fact tells you more about a feed than the brand name or any marketing claim on the front of the bag.
This panel is required on every commercial horse feed sold in the United States. It gives you the manufacturer's legal commitment to nutrient levels. Every number here is a guarantee — the feed must meet these levels in every bag.
Understanding minimums vs maximums:
| Nutrient | What it means | Typical range | Watch for |
|---|---|---|---|
| Crude Protein (min) | Total protein estimate based on nitrogen content. Quantity, not quality. | 10–32% | High % in ration balancers is normal — they're fed in tiny amounts |
| Crude Fat (min) | Total fat content. Higher = more calories, more coat support. | 3–22% | Above 8% = meaningfully high-fat formula |
| Crude Fiber (max) | Minimum indigestible fiber. Higher = more forage character. | 8–35% | Above 18% = complete feed or forage supplement |
| ADF (max) | Least digestible fiber. Higher ADF = lower energy. | 10–38% | Above 25% = significant forage character |
| NDF (max) | Total structural fiber. Higher = more gut fill, slower passage. | 20–60% | Above 35% = forage-like feed |
| Calcium (min/max) | Both a min and max are required. Important for bone and muscle. | 0.5–2.0% | Check ratio to phosphorus (should be 1.5–2:1, Ca:P) |
| Phosphorus (min) | Bone mineralization, energy metabolism. Must be below calcium. | 0.4–1.0% | Phosphorus must not exceed calcium in the total diet |
| Selenium (min) | Antioxidant trace mineral. Very narrow safe range. | 0.2–0.6 ppm | Total from all sources must stay below 2 mg/day |
| Vitamin E (min) | Fat-soluble antioxidant. Critical for muscle and nerve health. | 50–500 IU/lb | Horses without pasture need ≥1,000 IU/day total |
| Vitamin A (min) | Vision, immune function, reproduction. Can be toxic in excess. | 2,000–15,000 IU/lb | Don't stack multiple fortified feeds + supplements |
NSC stands for Non-Structural Carbohydrates — the sum of all starch and sugar in the feed. It is the single most important number for any horse with:
For these horses, total diet NSC should stay below 10%. For healthy horses in work, NSC below 20% is generally fine.
| NSC Level | Classification | Suitable for |
|---|---|---|
| Below 10% | Low NSC | All horses including EMS, PPID, laminitis, PSSM |
| 10–15% | Moderate NSC | Healthy horses, light to moderate work — use caution with metabolic horses |
| 15–20% | Moderate-high NSC | Horses in active work — not appropriate for metabolic horses |
| Above 20% | High NSC | Performance horses in heavy training — not for easy keepers or metabolic horses |
Verified low-NSC feeds in our library: Triple Crown Lite (9.3%), Nutrena SafeChoice Special Care, Triple Crown Low Starch (13.5%), Buckeye Safe N Easy Pelleted (12.5%), Buckeye Safe N Easy Senior (~12%).
These two measurements describe the fiber in a feed and are required on all AAFCO-compliant horse feed labels. They sound technical but they tell you something simple: how digestible the feed is, and how much gut fill it provides.
ADF (Acid Detergent Fiber) measures cellulose and lignin — the least digestible fractions. Higher ADF = lower energy content. Hay with ADF above 45% is mature, stemmy, and poor quality. In commercial feeds, ADF above 20–25% indicates significant forage character.
NDF (Neutral Detergent Fiber) measures all structural fiber: cellulose, hemicellulose, and lignin. NDF is always higher than ADF. Higher NDF means more gut fill, more chewing time, more saliva production, and greater time for fermentation. For horses with ulcers or digestive issues, higher NDF is a positive.
Selenium is the one trace mineral where more is not better. The margin between adequate and toxic is narrower for selenium than any other nutrient in horse feeding. Deficiency causes white muscle disease; toxicity (selenosis) causes hair loss from the mane and tail, horizontal cracking of the hooves, and in severe cases, death.
Selenium is expressed in ppm (parts per million, equivalent to mg/kg). To calculate how much your horse gets from a feed:
Selenium sources on labels:
Regional soil selenium varies dramatically — Pacific Northwest and Northeast US are deficient; parts of Wyoming, South Dakota, and Nebraska can be toxic. Know your region.
These three fat-soluble vitamins are stored in body fat and liver — which means they can accumulate to toxic levels if oversupplemented from multiple sources. Read them as a system, not individually.
| Vitamin | What it does | Key concern | Daily need (1,100lb horse) |
|---|---|---|---|
| Vitamin E | Antioxidant. Muscle health, immune function, nerve health. Lowest in hay — horses without pasture are frequently deficient. | Natural d-alpha-tocopherol is 2–3× more bioavailable than synthetic dl-alpha-tocopherol. Same IU label ≠ same effect. | 500 IU/day maintenance; 1,000+ IU/day without pasture |
| Vitamin A | Vision, immune function, reproduction. Horses at pasture synthesize from beta-carotene in grass. | Can accumulate to toxic levels. Don't stack multiple fortified feeds + supplements. Hay loses beta-carotene during storage. | 15,000 IU/day; 22,500 IU/day for pregnant mares |
| Vitamin D | Calcium absorption, bone mineralization. Horses synthesize from sunlight. Horses with outdoor access usually adequate. | Most toxic fat-soluble vitamin when oversupplemented — causes soft tissue calcification. Stacking feeds is a real risk. | 3,300 IU/day; more for horses without sunlight |
The Ca:P ratio (calcium to phosphorus) is one of the most critical mineral relationships in equine nutrition. The target across the total diet is 1.5 to 2:1 calcium to phosphorus.
An inverted ratio — where phosphorus exceeds calcium — triggers nutritional secondary hyperparathyroidism. The horse's parathyroid gland detects low blood calcium and mobilizes calcium from bone to compensate. Over time this causes skeletal fragility, facial swelling ("big head disease"), and poor bone density.
Note: the Ca:P ratio of the total diet (feed + hay combined) matters, not just the feed alone. Alfalfa hay is calcium-rich; grass hay is more balanced. Grains are phosphorus-heavy. Commercial feeds adjust their Ca:P ratio with limestone and dicalcium phosphate — but adding a plain grain supplement can throw off a well-balanced complete feed.
These three trace minerals work together for hoof quality, coat health, immune function, and enzyme activity. They also compete with each other for absorption — and with iron, which is frequently excessive in hay and water.
| Mineral | Daily need | Form matters? | Key antagonist |
|---|---|---|---|
| Copper | 100 mg/day | Yes — copper proteinate > copper sulfate when iron is high | Iron. High iron in hay and water blocks copper absorption. |
| Zinc | 400 mg/day | Yes — zinc proteinate > zinc oxide | Copper. Maintain Zn:Cu ratio of 3–4:1. |
| Manganese | 400 mg/day | Modest — proteinate slightly better than oxide | Iron and calcium at high levels. |
When forms matter most: If your horse's hay or water is high in iron (common in many regions — test to find out), organic forms (proteinates, amino acid complexes) are meaningfully more effective because they resist iron interference during gut absorption. A feed listing only copper sulfate and zinc sulfate in an iron-rich environment may deliver far less copper and zinc than the label suggests.
Feed labels are required to show guaranteed values — not actual tested values. The actual nutrient content can vary between batches. Most manufacturers have technical staff who can provide:
Quality manufacturers — Triple Crown, Nutrena, Purina, Buckeye, Seminole — all have equine nutritionists available by phone or email. Use them.
Photograph any feed label and get a plain-English breakdown of every ingredient and guaranteed analysis value — instantly.