1. Department of Agricultural Sciences; University of Naples “Federico II”; 80055 Portici NA Italy
2. Department of Veterinary Sciences; University of Pisa; 56124 Pisa Italy
3. Department of Agricultural Sciences; University of Sassari; 07100 Sassari Italy
4. Department of Physiology; Kasetsart University; 10900 Bangkok Thailand
5. Research and Development Institute for Bovine Breeding; 077015 Balotesti Bucharest Romania
6. Department of Agricultural, Forest and Food Science; University of Torino; 10095 Grugliasco TO Italy