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, 4000 Plovdiv, Bulgaria 3Freelance scientific advisor

Abstract. The growing scientific interest in the coagulation ability of milk in leading countries in Europe and in the world, is the premise for the research carried out by us in this direction. In this study 49 individual milk samples of goats from the autochthonous breed Kalofer Longhaired were examined for coagulation ability and qualitative composition of the milk. Analysis of individual coagulation ability was made in the dairy lab of Agricultural Institute, Stara Zagora through Computerized Renneting Metter – Polo Trade, Italy. The studied phenotypic parameters defining the dynamics of the qualitative composition of milk are with average values, respectively: fat – 4.15%, protein – 3.34%, dry non-fat substitutes (DNS) – 8.84%, lactose – 4.84% and pH – 6.62. The average values of exponents are rennet clotting time (RCT) – 11.47min, curd firming time (CR) – 0.86min, and curd firmness – 27.16 mm. Coagulation ability of the milk of Kalofer Longhaired goat have good technological properties for the production of traditionally identical milk products.