1. Faculty of Veterinary Medicine, University of Teramo, Teramo 64100, Italy
2. Genetics Unit, Department of Biology, University Autónoma of Madrid, Catoblanco, 28049 Madrid, Spain
3. Department of Reproduction Management, Leibniz Institute for Zoo and Wildlife Research, Berlin 10315, Germany
4. Present: Faculty of Veterinary Medicine, University of Teramo, Teramo 64100, Italy