1. Dipartimento di Medicina Veterinaria, Sezione di Clinica Ostetrica e Ginecologia, Università di Sassari, Sassari, Italy
2. Department of Animal Production, Faculty of Agriculture, Mansoura University, Mansoura, 35516, Egypt
3. Animal Production Research Institute, Dokki, Giza, Egypt
4. Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
5. Gamete Research Centre, Department of Veterinary Sciences, University of Antwerp, 2610 Wilrijk, Belgium