Silage Corn lucerne Grass Element n=30 n=11 n=10 Cu Mean 9.80 9.67 8.10 SD 4.70 4.39 4.83 Zn Mean 55.99 57.52 53.60 SD 34.61 27.51 30.10

Table 5: The content of Cu and Zn (mg/kg) in feed from western Slovakia.