Affiliations:
1 School of Veterinary Medicine, Faculty of Veterinary Medicine and Agronomy, Universidad de las Américas, Concepción, Chile. (I.T)
2Faculty of Agricultury Sciences, Universidad del Alba, Chillán, Chile. (I.T)
3Manager of the Equine Tracer Center. Chilean Army Agreement –INDAP. Municipality of Bulnes and San Carlos, Ñuble, Chile. (RC)
4Departament of Animal Sciences, Faculty of Veterinary Science, Universidad de Concepción, Av. Vicente Méndez 595, Chillán, Chile. (F.S, S.ML)
5Pathology Departament, Faculty of Veterinary Science, Universidad de Concepción, Av. Vicente Méndez 595, Chillán, Chile. (R.O, N.Z)