With two last decades there has been a very big interest in various feed additives and supplements as, e.g. prebiotics, probiotics, phytobiotics and symbiotics which are applied to keep and maintain a necessary level of the useful microorganisms who could create an environment the nutrients of the feed to be digested more effectively in the tract of animal. From the 1st of January, 2006 in EU there was a ban announced regarding the use of feed antibiotics to obtain better productivity of agricultural animals. For this reason the growers of the agricultural animals started to look for an alternative which could be approved by numbers of the tests. The goal of the study – to reveal what was the influence of “ARBOCEL RC” and “VITACEL R 200” raw fiber concentrates on the both daily weight gain and carcass characteristics of the crossbreed pigs.