Bulletin #1006, Equine Facts: Pasture and Hay for Horses (PDF) Prepared by Marvin H. Hall, Professor of Forage Management, and Patricia Comerford, Instructor in Animal Science, at the Pennsylvania State University. Reprinted with permission of Penn State. For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/.