Single cow can produce enough methane from its dung to boil more than 10 liters of water per day
Cow dung is full of methane and because cows produce up to 54 kg (120 lbs) of manure every day, it is great source for methane. Methane is flammable gas, so it can be used to generate electricity, heat houses or power cars.
There are other appliances to cow dung. For example, cow dung (usually combined with soiled bedding and urine) is often used as manure (agricultural fertilizer). If not recycled into the soil by species such as earthworms and dung beetles, cow dung can dry out and remain on the pasture, creating an area of grazing land which is unpalatable to livestock. In many parts of the developing world, caked and dried cow dung is used as fuel.