1. Department of Agricultural and Food Sciences; Division of Animal Sciences; University of Bologna; Viale Fanin 46 40127 Bologna Italy
2. Institut für Populationsgenetik Veterinärmedizinische University Wien; Josef Baumann Gasse 1 1210 Wien Austria
3. Department of Statistical Sciences “Paolo Fortunati”; University of Bologna; Via delle Belle Arti 41 40126 Bologna Italy
4. Centre for Genome Biology; University of Bologna; Bologna Italy