1. Department of Food Science and Technology; Faculty of Agriculture; Aristotle University of Thessaloniki; 54124 Thessaloniki Greece
2. Dairy Research Institute; NAGREF; Ethnikis Antistaseos 3, Katsikas Ioannina 45221 Greece
3. Unita di Ricerca per la Zootecnia Estensiva; CRA-ZOE, Consilio per la Ricerca e Sperimentazione in Agricoltura; Bella (PZ) Italy