U.S.:Cleaning up after livestock - (Science News Online)
November 3, 2007 – 8:03 pmAs any pet owner knows, the more food that goes into an animal’s mouth, the more wastes that eventually spew out the other end. The story says that the bigger the animal, the bigger its appetite. So imagine the volumes of manureoften tainted with germsthat farmers must manage for even a small feedlot with perhaps 3,500 head of cattle.
Ordinarily, beef producers house their animals in penssome the size of football fields or larger. They’re designed to leave each animal about 80 square feet of space. Cattle wastes just fall to the ground and collectoften for
a month or morebefore feedlot crews periodically scrape away the muck. After composting, the dried manure will be applied to fields as a rich fertilizer.
The real problem develops when it rains. Then, a manure-rich, watery slurry can drain off the fields. Conventionally, feedlot managers would divert this liquid into huge, smelly ponds or lagoonssome 10-feet deep […]
MORE:
http://www.extension.iastate.edu/foodsafety/news/fsnews.cfm?newsid=22354
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