1. Department of Large Animal Clinical Sciences; College of Veterinary Medicine; University of Florida; Gainesville FL USA
2. Department of Animal Science; University of California; Davis CA USA
3. Department of Animal Sciences; University of Illinois; Urbana IL USA
4. Research Triangle Institute; Research Triangle Park NC USA
5. Department of Veterinary Science; Maxwell H. Gluck Equine Research Center; University of Kentucky; Lexington KY USA