摘要：Animal manure management is an important issue currently receiving much attention from environmental regulators, the media, the public, and livestock producers. Manure management regulations are implemented in order to protect the environment and public health from the damage resulting from excessive nutrient concentration and runoff. Examples of this damage are the catastrophic lagoon spills from hog feeding operations in Iowa and North Carolina (Vukina, Roka, and Palmquist), the correlation of nutrients from livestock pollution with the recent pfiesteria piscicida outbreaks along the east coast of the United States (U.S. EPA, 1998), the possible contribution of livestock manure to the April 1993 chryptosporidium contamination of the city of Milwaukee's drinking water (NRCD), and the possible links between dairy operations and poor water quality in Erath County Texas (TIAER).
