Dairy Operations (image) University of Illinois at Urbana-Champaign Caption Wastewater from large dairies is a major source of estrogenic compounds in the environment. Credit Wei Zheng Usage Restrictions Photo may be used only with stories about the research described in this release. Credit required Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.