Horse Nutrition Calculator
Estimate your horse’s daily energy, protein, mineral and vitamin needs, based on NRC (National Research Council) requirements.
Frequently asked questions
What is Digestible Energy (DE)?
Digestible Energy (DE) measures the energy in feed that a horse can absorb and use, expressed in Megacalories (Mcal). A maintenance horse needs roughly 15–17 Mcal/day, while performance horses may need 25–35+ Mcal/day depending on workload intensity.
Why is the calcium-to-phosphorus ratio important?
Horses should receive 1.5 to 2.5 times more calcium than phosphorus. An inverted ratio (more phosphorus than calcium) can lead to bone problems including “big head disease” (nutritional secondary hyperparathyroidism). Always ensure calcium intake exceeds phosphorus.
What is lysine and why does it matter?
Lysine is an essential amino acid that horses cannot synthesize and must obtain from feed. It’s critical for muscle development, tissue repair, and growth. The NRC recommends lysine be at least 4% of total crude protein intake, especially for growing horses.
How do pregnancy and lactation affect requirements?
Late pregnancy (months 9–11) increases energy needs by 11–20% and protein by 30–40%. Lactating mares have the highest nutritional demands, requiring nearly double the energy and 2–3× the protein and minerals of a maintenance horse to support milk production.
Are these NRC values minimum or optimal?
NRC values represent minimum requirements to prevent deficiency. Many equine nutritionists recommend feeding 25–50% above NRC minimums for vitamins and minerals under practical conditions. Performance horses, senior horses, and those under stress often benefit from higher intake levels.