1. Institute of Animal Reproduction and Food Research of Polish Academy of Sciences (A.W., A.B., M.M.K., A.J.Z.), 10-747 Olsztyn, Poland
2. Department of Physiology (A.R.-M., L.J.S.B., N.A.R.), University of Turku, 20520 Turku, Finland
3. Graduate School of Integrated Science and Art (K.W.), University of East Asia, Yamaguchi 750-8503, Japan