The levels of microelements Mn, Fe, Cu, Co, Cd, Zn and Se in muscles and organs of broiler chickens were estimated. Sixty samples of breast muscles, gizzard, heart and liver were choosen for this purpose. The samples were obtained from three groups at time of slaughter, control one and other two groups fed on diets having high level of mineral mixture. The results revealed that adding excessive mineral mixture adversely affect food utilization efficiency manifested by increased feed intake and decreased weight gain development. The levels of Mn and Cu were significantly decreased in the examined samples of groups (2) and (3) while Fe was only decreased in group (1). Selenium level was increased as the dietary level increased. Other elements, Fe, Co, Zn and Cd were more or less changed. The public health significance of these microelements was discussed.