K. Stankov Department of Management, Faculty of Economics, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 22 August 2020; accepted for publication 16 October 2020) Abstract. A study was conducted on the effect of clinical mastitis at Holstein-Friesian cows on the

K. Stankov* Department of Management, Faculty of Economics, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 1 December 2019; accepted for publication 28 February 2020) Abstract. The economic efficiency of ewes from the Bulgarian dairy synthetic population (BDSP) an