مؤلف: Wendy E. Vaala

Angus O. Mc Kinnon, BVSc, MSc, Diplomate ACT and ABVP, Goulburn Valley Equine Hospital, Victoria, Australia Edward L. Squires, BS, MS, Ph D, Executive Director of the Gluck Equine Research Foundation, Research Professor, Department of Veterinary Science, M.H. Gluck Equine Research Center, University of Kentucky, Lexington, KY Wendy E. Vaala, VMD, Diplomate ACVIM, Senior Equine Technical Service Veterinarian, Intervet/Schering-Plough Animal Health, Alma, WI Dickson D. Varner, DVM, MS, Diplomate ACT, Professor and Pin Oak Stud Chair of Stallion Reproductive Studies, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX