Lukanov, A. Genchev, E. Halil   Department of Animal Science – monogastric and other animals, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria.   (Manuscript received 13 March 2018; accepted for publication 2 May 2018)   Abstract. The aim of

H. Lukanov1*, A. Genchev1, A. Pavlov2, I. Penchev1 1Department Animal Science – monogastric and other animals, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Pharmacology, Physiology of animals and Physiological chemistry, Faculty of Veteri

H. Lukanov1*, A. Genchev1, A. Pavlov2 1Department of Animal Science, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Pharmacology, Animal Physiology and Physiological Chemistry, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora,

H. Lukanov Abstract. Chicken eggs with blue-green coloured eggshells have been known for centuries. The pigmentation is due to deposition of biliverdin IX and biliverdin zinc chelate in eggshell and underlying membranes during their formation. The deposition of pigment is determined b