KAYA A, KAYA H, MACIT M, CELEBI S, ESENBUGA N, YORUK MA, KARAOGLU M. Effects of Dietary Inclusion of Plant Extract Mixture and Copper into Layer Diets on Egg Yield and Quality, Yolk Cholesterol and Fatty Acid Composition. Kafkas Univ Vet Fak Derg, 19 (4): 673-679, 2013. DOI: 10.9775/kvfd.2013.8644