1. Department of Zoology and Anthropology, Faculty of Natural Sciences , Constantine the Philosopher University in Nitra , Nabrezie Mladeze 91, 949 74 Nitra , Slovak Republic
2. Institute of Animal Science , Pratelstvi 815, 104 00 Prague - Uhrineves, Czech Republic
3. Ss. Cyril and Methodius University in Skopje , Lazar Pop - Trajkov 5-7, 1000 Skopje , Republic of Macedonia
4. Department of Botany and Genetics, Faculty of Natural Sciences , Constantine the Philosopher University in Nitra , Nabrezie Mladeze 91, 949 74 Nitra , Slovak Republic
5. The Czech Academy of Sciences, Institute of Animal Physiology and Genetics , Rumburska 89, 277 21 Libechov , Czech Republic