How Much Biogas Does One Cow Produce per Day? Daily Output by Feeding and Season
One dairy cow produces roughly 0.5–0.8 m³ of biogas per day from its manure (beef cattle 0.3–0.5 m³/day), at 55–65% methane. That daily gas is worth about 0.7–1.4 kWh of electricity or 3–5 kWh of heat. Output moves with feed intake and season—high-concentrate rations and stable warm digester temperatures lift daily yield toward the top of the band, while sand bedding and cold weather pull it down.
Daily Output by Animal Class
Daily gas tracks manure volatile solids, so animal class decides the baseline. A lactating dairy cow eating a high-concentrate ration excretes the most biodegradable matter and sits at 0.5–0.8 m³/day. Beef cattle on forage produce 0.3–0.5 m³/day. Heifers and calves fall to 0.2–0.3 m³/day. Multiply by herd size for a daily plant figure—100 dairy cows give roughly 50–80 m³/day before any co-digestion.
Comparative Data Table: Daily Biogas per Animal
| Animal Class | Manure (kg/day) | Biogas (m³/day) | CH₄ (%) |
| Lactating dairy cow | 28–34 | 0.5–0.8 | 60–65 |
| Beef cow | 20–26 | 0.3–0.5 | 55–60 |
| Heifer / calf | 10–15 | 0.2–0.3 | 55–60 |
Why Daily Output Moves
Five factors shift the daily figure. Ration: more concentrate raises volatile solids and gas. Bedding: sand dilutes organics and can cut effective yield sharply, while straw adds carbon that co-digests well. Temperature: mesophilic digesters held at 35–38°C outperform cold or fluctuating tanks. Retention time: 25–30 days recovers more of the biodegradable fraction. Milking and feeding schedule: manure collection timing changes what actually reaches the digester that day.
Frequently Asked Questions (FAQ)
Q1: Does feeding change daily biogas output?
A: Yes. High-concentrate rations raise the volatile solids in manure and lift daily gas toward 0.8 m³/cow, while forage-only diets sit lower. Feed changes show up in gas output within days, so ration shifts visibly move plant yield.
Q2: How much electricity from one cow per day?
A: About 0.7–1.4 kWh of electricity per dairy cow per day, assuming 0.5–0.8 m³ of biogas at roughly 1.4–1.7 kWh/m³ in a genset. As heat instead, the same gas delivers roughly 3–5 kWh thermal.
Q3: Why does daily output vary by season?
A: Cold weather cools digesters and slows biology, lowering gas unless the tank is heated and insulated. Winter rations and bedding changes also alter manure solids. Holding 35–38°C year-round keeps daily output stable.
Q4: How much gas for a 100-cow herd per day?
A: Roughly 50–80 m³/day from dairy cows at 0.5–0.8 m³ each, before co-digestion. That supports about 70–140 kWh of electricity per day, or equivalent heat, and rises 10–30% with food waste co-digestion.