date:Jun 07, 2012
that such regulations also protect groundwater and surface waters from contamination with animal hormones and veterinary pharmaceuticals, but this has not been proven.
Hormone concentrations in livestock wastes are 100 to 1,000 times higher than those emitted from plants that treat human sewage, and large dairy farms are a primary source of estrogens in the environment, Mr Zheng said. Recent studies have detected estrogenic hormones in soil and surrounding watersheds after dairy wastewater was