Design defines response of selenium

For centuries, selenium was considered a toxic element. In recent decades, however, its advantages have also been discovered. Selenium is a useful element in animal nutrition, such as for poultry, but proper use is essential. By Dr. Frank Edens , Department of Poultry Science, NC State University, Raleigh, NC, USA, and Dr. Ted Sefton , Alltech, Guelph, ON, Canada   As with so many things in the world, the better the design of a specific item to meet a specific need, the better the response