Element Before calving Before calving Top of lactation n=10 n=10 n=10 Cu Mean 18.02 22.68 22.49 SD 11.91 17.56 17.93 Zn Mean 70.93 95.10 95.24 SD 27.45 18.01 23.05

Table 3: The contents of trace elements (mg/kg) in the TMR for dairy cows from western Slovakia.