S. Slavova* Agricultural Institute, Radnevo road, 6000 Stara Zagora, Bulgaria (Manuscript received 11 July; accepted for publication 01 September 2022) Abstract. Selection is an important part of animal breeding and is usually performed on the basis of a set of traits, each of them ch

1_AST_2_June_2022S. Slavova*, T. Angelova, J. Krastanov Agricultural Institute, 6000 Stara Zagora, Bulgaria (Manuscript received 4 April 2022; accepted for publication 23 May 2022) Abstract. Bio-economic models for deriving economic weights in livestock have a significant development