The US livestock industry has undergone dramatic changes in the last 20 years . The livestock and poultry industry tends to have fewer, but larger and more intensive specialized operations, which results in more concentrated manure and other animal wastes. This can lead to a significant increase in the contaminants in the watercourses in industrial operational areas. Wastes may be more concentrated in nonagricultural areas where there is inadequate land to accommodate the application of the manure (e.g., as a fertilizer).
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