Donkeys are frequently managed as if they're small horses, fed the same hay in similar quantities. This is a common and serious mistake — donkeys are significantly more efficient at extracting nutrition from forage than horses, and feeding horse-quality or horse-quantity hay to donkeys is one of the primary causes of obesity, hyperlipemia, and founder in donkeys kept on small farms.
How Donkeys Differ From Horses Nutritionally
Donkeys evolved in semi-arid environments on sparse, coarse vegetation — primarily dry grasses, shrubs, and browse. Their digestive systems are adapted to extract maximum nutrition from minimum-quality forage. A standard horse's maintenance hay ration would provide excess energy for most donkeys, causing rapid weight gain.
The critical implication: donkeys need lower-calorie, higher-fiber hay than horses — and less of it per pound of body weight.
Daily Hay Requirements for Donkeys
| Donkey Size | Body Weight | Daily Hay (lbs) | Notes |
|---|---|---|---|
| Miniature donkey | 200–350 lbs | 2–4 lbs | Very easy keepers; obesity is the #1 health risk |
| Standard donkey | 400–570 lbs | 4–7 lbs | Maintenance only; adjust down if overweight |
| Mammoth donkey | 900–1,100 lbs | 9–14 lbs | Closer to horse-sized needs but still more efficient |
| Pregnant jenny (last trimester) | Any | Add 15–20% to base | Modest increase; avoid overfeeding |
Best Hay Types for Donkeys
Mature, stemmy grass hay — the type that horse owners reject as "too coarse" — is actually ideal for donkeys. First-cutting grass hay with high fiber and moderate protein (7–10% CP) is appropriate for most donkeys at maintenance. The coarser the texture, the better it matches what donkeys evolved to eat.
Avoid alfalfa and rich legume hays for donkeys at maintenance. The protein and energy density of alfalfa causes rapid weight gain in donkeys. Reserve any alfalfa content for severely underweight animals or late-term pregnant jennies under veterinary guidance.
Avoid lush, leafy, second- or third-cut grass hay for easy-keeper donkeys. The higher sugar content of leafy late-cut hay increases laminitis risk in obesity-prone animals.
Monitoring Body Condition in Donkeys
Donkeys deposit fat differently than horses — fat accumulates along the crest of the neck, over the shoulder, and at the base of the tail. A "cresty neck" is a warning sign of obesity and insulin dysregulation in donkeys. Body condition scoring for donkeys uses the same 1–9 scale as horses but requires attention to these donkey-specific fat depot locations. Ideal BCS for most standard donkeys is 3–4 — leaner than most horse owners expect.