1. Gamete Research Centre, Laboratory for Veterinary Physiology and Biochemistry, Department of Veterinary Sciences, University of Antwerp, 2610 Wilrijk, Belgium
2. Centre for Proteomics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
3. Health Unit, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium
4. Department of Theriogenology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt