The article provides information on the mineral metabolism in the body of an agricultural bird. Studies have shown that when incorporating biologically active substances along with plant extracts, they help to improve the immunity of the birds. This article is devoted to the study of the effect of antibiotic and oak bark extract on mineral metabolism in the body of broiler chickens. During the study it was revealed that the pectoral muscles of the bird contain an excess of such trace elements as cobalt, silicon, vanadium, copper, zinc, and iodine. Oak bark extract in the pectoral muscles and in the muscles of the thigh contributed to the elimination of toxic elements, so the level of aluminum in absolute terms was significantly reduced. The inclusion of antibiotics also led to a significant decrease with respect to aluminum control. The maximum decrease in the level of toxic elements was observed in the group that was additionally co-administered with an antibiotic and oak bark extract. It has been found that extracts of these herbs enhance broiler immunity and help balance the intestinal flora necessary for digestion and for protection against pathogenic microorganisms.Index Terms-Broiler muscle tissue, mineral metabolism, macronutrient composition, muscles of the bird, tetracycline antibiotic, toxic elements.