The aim of the paper is the probable scenario of changes which can be observed in the soil under influence of feed additives used in animal farming which reach the soil with animal's manure. The feed additives (e.g. antibiotics) inactivate microbial community. It leads to increase of plant debris in soil and elements are not available for plants, their production (primary production) fall down. Reduction of bacteria could cause loss of food source for soil fauna (protozoans, nematodes, microarthropods etc.) and its reduction. The reduction of soil animals community causes reduction of the soil community biodiversity and destabilisation of soil ecosystem. Those processes can cause the degradation of the soil and decrease of its productivity.