R. Binev*, I. Valchev, R. Russenov, Y. Nikolov Department of Internal Non-Infectious Diseases, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 7 September 2016; accepted for publication 19 December 2016) Abstract. Experiments for mon

R. Binev1*, I. Valchev1, R. Mihaylov2, Y. Nikolov1 1Department of Internal Non-Infectious Diseases, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Animal Morphology, Physiology and Nutrition, Faculty of Agriculture, Trakia University, 600