1. Escuela Agrícola Panamericana, El Zamorano; Carretera a Danli km 30, Valle del Yeguare Francisco Morazán Honduras
2. School of Nutrition and Food Sciences; Louisiana State University Agricultural Center; Baton Rouge LA 70803-4200 USA
3. Faculty of Veterinary and Agricultural Sciences; The University of Melbourne; Parkville VIC 3010 Australia