A standard 100-lb dairy doe needs 2–3 lbs of hay per day when she has good pasture access. When pasture is unavailable — late fall through early spring in most climates — that jumps to 4–6 lbs per day as hay becomes her primary forage source. The exact number depends on her body weight, whether she's pregnant or lactating, the quality of the hay, and how cold the weather is. This guide walks through every variable with a lookup table you can print.
The Basic Rule: 2–4% of Body Weight in Forage Daily
Goats require forage (hay, pasture, browse) equal to 2–4% of their body weight per day. When calculating hay needs specifically — rather than total forage — use the lower end of that range when pasture supplements their intake, and the full amount when hay is their only forage source.
| Goat Weight | Hay Only (winter/no pasture) | Hay + Pasture (mixed) | Typical Breeds This Size |
|---|---|---|---|
| 50 lbs | 2.0–2.5 lbs/day | 1.0–1.5 lbs/day | Nigerian Dwarf, Pygmy (small) |
| 75 lbs | 2.5–3.5 lbs/day | 1.5–2.0 lbs/day | Pygmy (adult), Nigerian Dwarf (large) |
| 100 lbs | 3.5–4.5 lbs/day | 2.0–3.0 lbs/day | LaMancha, Oberhasli, small Alpine |
| 125 lbs | 4.5–5.5 lbs/day | 2.5–3.5 lbs/day | Alpine, Saanen, Toggenburg |
| 150 lbs | 5.5–7.0 lbs/day | 3.0–4.5 lbs/day | Boer (doe), large Saanen |
| 200 lbs | 7.0–9.0 lbs/day | 4.0–5.5 lbs/day | Boer (buck), large dairy breeds |
Life Stage Changes Everything
The table above is for dry (non-pregnant, non-lactating) does. Pregnancy and lactation significantly increase energy and nutrition demands — and failing to adjust hay at these stages is one of the most common goat health mistakes on small farms.
Pregnant Does (Especially Late Pregnancy)
The last 6 weeks of pregnancy (called "late gestation" or "flushing") are when the kids develop most rapidly and when the doe's nutritional demands spike hardest. During this period:
- Increase hay by 15–20% over her dry ration
- Switch from pure grass hay to mixed grass-legume or alfalfa hay if possible — the higher protein supports kid development
- Alfalfa or alfalfa-mix pellets can supplement if you don't have better quality hay available
- Divide feedings into smaller amounts more frequently — a heavily pregnant doe's rumen is compressed by the kids, so she physically can't eat as much at one time
Does underfed in late gestation are prone to pregnancy toxemia (ketosis) — a serious metabolic disorder that can be fatal. If a doe goes off feed in the last two weeks before kidding, contact your veterinarian promptly.
Lactating Does
A doe in peak milk production requires more energy per pound of body weight than at any other life stage — more even than late pregnancy. Dairy breeds producing 1 gallon of milk daily need roughly 30–40% more forage than a dry doe of the same weight. Practical adjustments:
- Offer hay free-choice during peak lactation — let her eat what she needs
- High-quality alfalfa or alfalfa-mix hay supports milk production better than pure grass hay
- Supplement with grain if hay quality is average and production is high (this is standard practice for dairy goat farms)
- Watch body condition score monthly — a lactating doe losing weight rapidly despite adequate hay intake needs a ration adjustment
Bucks
Mature bucks in non-breeding season are easy keepers — they can often maintain good condition on moderate-quality grass hay alone. During breeding season (rut), bucks often go off feed naturally and lose condition. Offering high-quality hay and monitoring weight during this period prevents excessive condition loss. Avoid high-alfalfa diets for wethers or intact bucks not in active breeding — the high calcium:phosphorus ratio in alfalfa increases the risk of urinary calculi.
Kids (Weaning to 6 Months)
Kids begin nibbling hay within the first week of life and should have high-quality leafy hay available free-choice from day one, even when still nursing or on milk replacer. By weaning (typically 8–12 weeks), kids should be eating 1–2 lbs of hay per day. Hay quality matters more for kids than adults — leafy, fine-stemmed grass or alfalfa hay is appropriate; coarse, stemmy hay is poorly digestible for small rumens.
Hay Quality Affects How Much Goats Need
Goats fed low-quality, stemmy hay will eat more of it (or attempt to) to meet their nutritional needs — and waste significantly more trying. Higher-quality leafy hay delivers more nutrition per pound, meaning goats need less of it. The general rule:
- Premium hay (leafy, fine-stemmed, good color, fresh smell): Feed at the lower end of the weight range
- Average hay (mixed leaf/stem, some weather coloring): Feed at the midpoint of the weight range
- Poor hay (mostly stemmy, dull color, minimal leaves): Feed at the high end of the range and consider supplementing with alfalfa pellets or grain
See our guide to reading a hay quality test for how to assess hay nutritional content before buying.
Why Goats Waste So Much Hay — And How to Stop It
Goats are browsers by nature — they evolved eating shrubs, leaves, and varied plant material at different heights, not grazing grass at ground level. This instinct means they're hardwired to paw at, sort through, and reject hay that touches the ground or has been "contaminated" by contact with their hooves or manure. The result: a goat herd can waste 30–50% of its hay without the right feeder.
Feeder Types and Their Actual Waste Rates
| Feeder Type | Estimated Waste | Best For | Notes |
|---|---|---|---|
| Ground feeding (no feeder) | 40–60% | Nobody | Never recommended |
| Cattle hay ring | 35–50% | Cattle, not goats | Bar spacing too wide for goats |
| V-manger (wooden) | 15–25% | Small herds | Easy DIY; works well for square bales |
| Keyhole feeder | 10–20% | Mixed herds | Goats insert heads, can't back out while eating — reduces competition |
| Covered metal manger | 8–15% | Any size herd | Roof keeps hay dry; best overall design |
| Slow-feed hay net | 5–10% | Single animals, small groups | Excellent waste reduction; check for hoof/horn entanglement risk |
Feeder Height Matters
Goats feed most naturally with their heads slightly elevated — at about the height they'd browse a shrub. Feeders positioned too low (below chest height) result in more pawing and sorting. The ideal goat manger positions hay at about chest to shoulder height for the breed you're feeding.
Winter Hay Planning for Goats
Planning your winter hay supply for goats requires accounting for several variables:
- When does your pasture stop providing meaningful nutrition? In most temperate climates, this is mid- to late October. Supplement with hay starting when grass growth visibly stops and animals are clearly eating it down without recovery.
- When does pasture return in spring? In Zone 6 (Kentucky, Virginia, Missouri), expect meaningful spring pasture by late March to mid-April in a typical year — though late springs can push this to May.
- Use the calculator: Enter your herd size and months of hay-only feeding into the Winter Hay Calculator for a total bale estimate.
For a basic estimate: 10 average-sized (100-lb) does fed hay-only for 5 months need approximately 4–6 lbs per day each, or 40–60 lbs total daily. Over 150 days of hay feeding, that's 6,000–9,000 lbs of hay — or 6–9 tons. At square bale weights of 40–60 lbs, that's 100–225 bales depending on bale size and waste. At round bale weights of 800–1,000 lbs, that's roughly 8–12 bales for the herd for the winter (accounting for typical feeder waste).
Hay Types for Goats
Goats are adaptable feeders but have preferences and restrictions worth knowing:
- Grass hay (timothy, orchard grass, bermuda): Appropriate for all goats as a maintenance diet. Good choice for wethers and bucks year-round.
- Mixed grass-alfalfa hay: Excellent for does, especially during pregnancy and lactation. Higher protein and calcium support reproductive performance.
- Pure alfalfa hay: Too high in calcium for wethers and non-breeding bucks — avoid or feed sparingly. Fine for does in late pregnancy and lactation.
- Orchard grass: Often a goat favorite — palatable, well-accepted, and widely available in the eastern US.
- Fescue: Infected fescue (fescue with endophyte fungus) can cause fescue toxicosis in goats, similar to the problem in horses. If you're in the Southeast or Midwest, make sure purchased fescue hay comes from endophyte-free or novel-endophyte fields. See your local extension office for testing resources.