RT Journal Article SR Electronic A1 Filipčík, Radek A1 Šubrt, Jan A1 Vyroubal, Martin T1 Biological characteristics that influence the SEUROP system classification for Czech fleckvieh and Holstein bull carcasses JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis YR 2014 VO 54 IS 2 SP 31 OP 40 DO 10.11118/actaun200654020031 UL https://acta.mendelu.cz/artkey/acu-200602-0004.php AB The aim of this work was to analyse the influence of certain characteristics (aptitude, age, carcass weight, net daily gain, feeding) on the final carcass classification in the SEUROP system. 703 Czech Fleckvieh bulls and 642 Holstein bulls were studied. The animals were slaughtered and evaluated at a designated beef processing company. Combine aptitude carcasses shown significant differences between characteristics. Remarkable differences of group averages (P&gt;0, 01) were established between farms and they were due to various rearing conditions. Also the levels of net daily gain between aptitudes were proved significantly. Holstein breed showed significant difference among The net daily gain &lt; 500 g.day<sup>-1</sup> and levels 551-600; 601-650 and above 651 g.day<sup>-1</sup>. The SEUROP system is influenced the most by the feeding regime, which is described by a net daily gain in this work, and farm impact.