1 Department of Animal Science, Agrifood Research and Technology Centre of Aragon (CITA), Avda. Montañana 930, 50059 Zaragoza, Spain; AgriFood Institute of Aragon - IA2 (CITA-University of Zaragoza), Zaragoza, Spain. Electronic address: emunnozul@cita-aragon.es.
2 INMA (CSIC-University of Zaragoza), c/ María de Luna, 3, 50018 Zaragoza, Spain.
3 Department of Animal Science, Agrifood Research and Technology Centre of Aragon (CITA), Avda. Montañana 930, 50059 Zaragoza, Spain; AgriFood Institute of Aragon - IA2 (CITA-University of Zaragoza), Zaragoza, Spain.