A. Boudebza1*, M.C. Abdeldjelil1, N. Arzour-Lakhel1, N. Lakhdara2 1PADESCA laboratory, Institute of Veterinary Sciences, road of Guelma 25100 El Khroub, University of Mentouri Brothers, Constantine 1, Algeria 2Department of Animal Production, Institute of Veterinary Sciences, road of

K. Stankov* Department of Management, Faculty of Economics, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 15 June 2019; accepted for publication 23 September 2020) Abstract. The present study aims to assess the influence of the age of first insemination and first