1. Wroclaw University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Reproduction and Clinic of Farm Animals, pl. Grunwaldzki 49, 50-366 Wroclaw, Poland
2. University of Tabriz, Faculty of Veterinary Medicine, Department of Basic Sciences, Tabriz, Iran
3. Mountain Top University, College of Basic and Applied Sciences, Department of Biological Sciences, Ogun State, Nigeria