1. Animal Physiology Laboratory; Veterinary Medicine School; National University of San Marcos; San Borja Lima Perú
2. Experimental Centre IVITA-El Mantaro; Veterinary Medicine School; National University of San Marcos; San Borja Lima Perú
3. Veterinary and Zootecnic Medicine School; Cayetano Heredia University (UPCH); San Martin de Porres Lima Perú
4. Department of Histology and Embryology; School of Veterinary Sciences, National University of La Plata; La Plata Buenos Aires Argentina
5. National Scientific and Technical Research Council (CONICET-CCT La Plata); Buenos Aires Argentina