1. Department of Botany and Genetics, Constantine the Philosopher University, Nitra 949 74, Slovakia
2. Department of Veterinary Disciplines, Slovak University of Agriculture, Nitra 949 76, Slovakia
3. Department of Animal Physiology, Slovak University of Agriculture, Nitra 949 76, Slovakia
4. Department of Zoology and Anthropology, Constantine the Philosopher University, Nitra 949 74, Slovakia