1Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, México
2Animal Production and Health Section International Atomic Energy Agency, Vienna, Austria
3Centre of Advanced Studies in Animal Nutrition, Indian Veterinary Research Institute, Izatnagar-243 122, India
*Corresponding author: salem@uaemex.mx
Online published on 4 January, 2014.
