Element Before calving Before calving Top of lactation n=12 n=12 n=12 Cu Mean 20.12 19.95 19.80 SD 10.95 10.60 5.14 Zn Mean 100.43 109.35 105.29 SD 55.56 47.89 38.92

Table 4: The contents of trace elements (mg/kg) in the TMR for dairy cows from eastern Slovakia.