1. National Agricultural and Food Centre Nitra, Animal Production Research Centre Nitra, Luzianky, Slovak Republic
2. Slovak University of Agriculture in Nitra, Faculty of Biotechnology and Food Sciences, Department of Animal Physiology, Nitra, Slovak Republic
3. Universidad Miguel Hernández de Elche, Department of Agro-Food Technology, Orihuela, Spain
4. Pedagogical University of Cracow, Institute of Biology, Kraków, Poland