Silage Corn lucerne Grass Element n=30 n=11 n=10 Cu Mean 11.02 13.78 13.02 SD 6.07 6.16 6.88 Zn Mean 21.77 75.04 58.13 SD 41.91 49.30 31.68

Table 6: The content of Cu and Zn (mg/kg) in feed from eastern Slovakia.