The content of Zn, Cu, Fe, Mn and Mg in the livers and muscles of fatteners fed on a mineral supplement Wisol T-87 from the 120th day of life to slaughter was determined by the method of atomic absorption spectrophotometry. The liver of fatteners fed on the mineral supplement Wisol T-87 was characterized by higher contents of Zn, Cu, Fe, Mn and a lower content of Mg. The muscles (m. longissimus dorsi) of fatteners fed on the mineral supplement Wisol T-87 contained a statistically significant lower level of Zn, Cu, Fe and Mn.