1 Department of Veterinary Sciences, University of Turin, Grugliasco (TO), Italy.
2 Wageningen University & Research, Wageningen Livestock Research, De Elst 1, 6700 AH Wageningen, the Netherlands.
3 Instituto de Ganadería de Montaña (CSIC-University of León), Finca Marzanas s/n, 24346 Grulleros, León, Spain.
4 Universidad Autónoma del Estado de México, Facultad de Medicina Veterinaria y Zootecnia, Instituto Literario 100. Toluca, Estado de México 50000, México.
5 Department of Agricultural, Forest and Food Sciences, University of Turin, Grugliasco (TO), Italy.