I. Zhelyazkova*, S. Lazarov *Department of Animal Science – non-ruminants and other animals, Faculty of Agriculture, Trakiа University, 6000 Stara Zagora, Bulgaria (Manuscript received 5 September 2017; accepted for publication 27 October 2017) Abstract. The objective of the pre

M. Petkova1*, M. Dimova2, D. Dimova1, S. Bistrichanov3 1Department of Genetics and Plant Breeding, Faculty of Agronomy, Agricultural University, 12 Mendeleev, 4000 Plovdiv, Bulgaria 2Department of Phytopathology, Faculty of Plant Protection and Agroecology, Agricultural University, 12