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In 1996, the Council for Agricultural Science and Technology (CAST) published a report entitled Integrated Animal Waste Management. One of the recommendations in that report was to “change animal diets to decrease nutrient outputs”(CAST 1996, 1). Since that time, concentration of animal production units has continued, public concern about the environmental effects of animal manure has increased, and the Environmental Protection Agency (EPA) has proposed more restrictive requirements for concentrated animal feeding operations (CAFO regulations).