Happy Hormone in Cows (IMAGE) University of Wisconsin-Madison Caption Holstein dairy cows feed at the Dairy Cattle Center at the University of Wisconsin -- Madison on May 7, 2014. Credit Bryce Richter Usage Restrictions None License Licensed content 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.