H. Lukanov1*, I. Pavlova2, A. Genchev1 1Department of Animal Science – monogastric and other animals, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of General livestock breeding, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Z

N. Arzour-Lakehal*, A. Boudebza PADESCA laboratory, Institute of Veterinary Sciences, road of Guelma 25100 El Khroub, University of Mentouri Brothers, Constantine 1, Algeria (Manuscript received 20 April 2021; accepted for publication 8 October 2021) Abstract. The objective of the res