1. Equine Science Center, Department of Animal Sciences, Rutgers the State University, 84 Lipman Drive, New Brunswick, NJ 08901-8525, USA.
2. Federal Rural University of Pernambuco, Rua Dom Manuel de Medeiros s/n, Dois Irmãos, Recife 52171900, PE, Brazil.
3. Department of Nutritional Sciences, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA.