T. Angelova*, J. Krastanov, D. Yordanova Agricultural Institute, 6000 Stara Zagora, Bulgaria (Manuscript received 11 February 2021; accepted for publication 20 September 2021) Abstract. The aim of the present study was to evaluate allele frequencies and genotypes of kappa casein (CSN3

G. Kalaydzhiev1*, A. Vuchkov2*, T. Angelova1, D. Yordanova1, V. Karabashev1, J. Krastanov1, D. Dimov2, N. Oblakov3, S. Laleva1, Y. Popova1 1Agricultural Institute, 6000 Stara Zagora, Bulgaria 2Departmet of Animal Science, Faculty of Agronomy, Agricultural University, 12 Mendeleev, 400