1. Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL, USA
2. Current Address: San Luis Rey Equine Hospital, Bonsall, CA, USA
3. Department of Animal Sciences, University of Florida, Gainesville, FL, USA
4. Current Address: Care First Animal Hospital, Cary, NC, USA
5. Current Address: Boehringer Ingelheim Animal Health, Duluth, GA, USA