#04-204

Complete

Date Full Report Received

07/14/2006

Date Abstract Report Received

07/14/2006

Investigation

Institution:
Primary Investigator:

Measurable levels of estrogens were found in lagoons from all types of production with boars and sows being higher than finishing units. The number of nursery units sampled was limited but those still had levels that could affect fish based on toxicology studies. Levels were below what has been reported for human sewage and cattle feedlots. Storage reduced levels of the most potent estrogens. Runoff from fields was not been tested but based on the limited published research, rainfall events shortly after land application (Burnison et al., 2003) could result in detectable estrogen levels in groundwater. Methods of storage and different types of ground application need to be tested. Storage under lab conditions reduced the estradiol concentration. Since most estrogens are excreted from pigs in urine systems that separate urine and feces may be of use in reducing estrogens in the environment from pork production.