1. Centre of Biosciences of the Slovak Academy of Sciences, Institute of Animal Physiology, Oddelenie fyziologie traviaceho traktu, Kosice, Slovakia
2. University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
3. Department für Nutztiere und öffentliches Gesundheitswesen, Institute of Animal Nutrition and Functional Plant Compounds, University of Veterinary Medicine Vienna, Vienna, Austria
4. National Agricultural and Food Centre, Nitra-Luzianky, Slovakia
5. Katedra mikrobiologie a imunologie, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia
6. Katedra biologie a fyziologie, University of Veterinary Medicine and Pharmacy, Kosice, Slovakia