the objective of this study was to comparatively analyse the physical parameters, basic chemical composition and the macro- and mi- croelement content of offal obtained from fattening pigs raised in deep litter and slatted floor housing systems. the experiment involved a group of 80 Puławska fatteners, including 40 pigs kept in deep-litter pens (group i) and 40 pigs in slatted pens without bedding (group ii). offal (tongues, kidneys, hearts, lungs and livers) was evaluated for weight, physical characteristics (ph45, ph24, whC), chemical composition (water, protein, fat) and the content of minerals: macro- (k, na, Mg, Ca) and microelements (Zn, fe, Mn, Cu). Based on the results obtained, associations were found between housing system and basic chemical composition of some offal, i.e. percentage of water (slatted floordeep litter) in lungs, content of protein (slatted floor>deep litter) and fat (slatted floordeep litter); lungs: sodium (slatted floor>deep litter), potassium (slatted floordeep litter) and copper (slatted floor