Jerry R. RobersonDepartment of Large Animal Clinical Sciences, Virginia- Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061- 0442.
William S. Swecker JrDepartment of Large Animal Clinical Sciences, Virginia- Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061- 0442.
Lari L. HullenderDepartment of Large Animal Clinical Sciences, Virginia- Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061- 0442. Present address is Equicare, 1176 Congaree Rd, Hopkins, SC 29061.