Effect of feeding chelate complexes of trace elements on the average daily balance of Cu, Zn and Mn in the organism of cows during the period of lacta-tion
Naukovij vìsnik Lʹvìvsʹkogo nacìonalʹnogo unìversitetu veterinarnoï medicini ta bìotehnologìj ìmenì S.Z. G̀žicʹkogo