What is the energy potential from manure produced by livestock?

Most references on bomb calorimeter studies of manure indicate about 7,500 BTU/lb of manure dry matter. This value is similar to the energy in raw feedstuffs. One finishing pig will consume about 600 lb of feed. The energy content of the feed is about 5 million BTU. The pig will excrete about 150 lb of manure dry matter. Energy content of the manure is about 1 million BTU.
The water in manure must be vaporized before the manure will burn. …