1. Department of Animal Science, Universidade Federal de Lavras , Lavras, Minas Gerais 37203-202 , Brazil
2. Department of Medicine Veterinary and Animal Science, Universidad de Ciencias Aplicadas y Ambientales (UDCA) , Cartagena, Bolivar 130001 , Colombia
3. Department of Veterinary Medicine, Universidade Federal de Lavras , Lavras, Minas Gerais 37203-202 , Brazil
4. Cargill Animal Nutrition/Nutron , Campinas, São Paulo 13086-903 , Brazil
5. Department of Animal Bioscience, University of Guelph , Guelph, ON, Canada N1G 2W1
6. Department of Animal Sciences, Division of Nutritional Sciences, University of Illinois , Urbana, IL 61801 , USA