The aim of this study was to find out, whether fattening yield and trace element contents in plasma and liver are influenced when lower levels of trace elements as chelate compounds are given. Two groups of 40 4 weeks old piglets (body weight 7.81 ±1.19 kg) received rearing feed for 6 weeks and fattening feed for 12 weeks. The rearing feed of the control group (CG) contained 121 mg copper, 108 mg zinc, 199 mg iron and 97 mg manganese from sulphate compounds, whereas the feed of the experimental group (EG) contained 85 mg copper, 84 mg zinc, 171 mg iron and 82 mg manganese from chelated compounds. 25 and 16 mg copper, 110 and 67 mg zinc, 157 and 106 mg iron as well as 57 and 36 mg manganese were determined in the fattening feed stage I of the CG and EG, respectively, the fattening feed stage II contained 22 and 16 mg copper, 88 and 54 mg zinc, 123 and 108 mg iron, 57 and 40 mg manganese in the CG and in the EG, respectively. Every 6 weeks blood samples were taken to determine Zn and Cu content. At the end of the trial, the mean body weight of the CG (97.26 ±11.50 kg) was 0.92 kg higher than that of the EG. Feed conversion during the 12 weeks finishing period was 2.62 in the CG and 2.52 in the EG. After 6 weeks rearing period the plasma Cu content and after 6 weeks fattening period the plasma Zn content was significantly higher in the CG. At the end of the fattening period, the plasma Zn content as well as the plasma copper values were significantly higher in the CG (742 ±216 vs. 612 ±198 µg/l and 1479 ±289 vs. 1333 ±273 µg/l). In the liver tissue, zinc (206 ±85 vs.158 ±28 mg/kg dry matter) and iron were significantly higher in the CG, whereas no difference was found concerning copper and manganese values. Despite the lower concentrations of trace elements in plasma and tissue, the fattening performance shows that diets with lower trace element contents given as chelated compounds support normal growth rates and health status in fattening pigs.