Affiliation: | 1. Reproduction Laboratory, The Maxwell H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, USA;2. Veterinary Diagnostic Laboratory, Department of Veterinary Science, University of Kentucky, Lexington, USA;3. Woodford Equine Hospital, Versailles, Kentucky, USA;4. Hagyard Equine Medical Institute, Lexington, Kentucky, USA |