1. Department of Applied Microbiology Institute of Microbiology Faculty of Biology University of Warsaw I. Miecznikowa 1 02‐096 Warsaw Poland
2. Department of Microbiology and Reproductive Biology University of Life Sciences Akademicka 13 20‐950 Lublin Poland
3. Department and Clinic of Animal Reproduction Faculty of Veterinary Medicine University of Life Sciences Głęboka 30 20‐612 Lublin Poland
4. Department of Animal Hygiene and Environment University of Life Sciences Akademicka 13 20‐950 Lublin Poland
5. Regional Agrochemical Station in Lublin Sławinkowska 5 20‐810 Lublin Poland