Abstract

An accumulation of huge amount of animal solid and liquid waste poses serious problems to health of human beings and beasts alike and is the source of pollution of nearby streams and rivers. In addition, the large amount of undigested protein remaining in the excrement represents a valuable resource that for the most part is being wasted, due to our growing dependence on chemical fertilizers. To realize the magnitude of the problem, in the united states for example, approximately one billion metric tons of solid waste and nearly 400,000,000 tons of liquid waste are produced each year (Van Dyne and Gilbertson 1978).

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