1 Department of Animal Pathology, University of Zaragoza, Spain.
2 Department of Animal Production and Food Science, University of Zaragoza, Spain.
3 Department of Anatomy, Embryology and Animal Genetics, University of Zaragoza, Spain; Instituto Universitario de Investigación Mixto Agroalimentario de Aragón (IA2), University of Zaragoza, Spain.
4 Department of Animal Pathology, University of Zaragoza, Spain; Instituto Universitario de Investigación Mixto Agroalimentario de Aragón (IA2), University of Zaragoza, Spain.
5 Institute of Agrobiotechnology, CSIC-Public University of Navarra, Mutilva Baja, Navarra, Spain.
6 Department of Animal Production and Food Science, University of Zaragoza, Spain; Instituto Universitario de Investigación Mixto Agroalimentario de Aragón (IA2), University of Zaragoza, Spain.
7 Department of Animal Pathology, University of Zaragoza, Spain; Instituto Universitario de Investigación Mixto Agroalimentario de Aragón (IA2), University of Zaragoza, Spain. Electronic address: Lluis.Lujan@unizar.es.