The aim of this study was to evaluate the effects of oral supplements of zinc and copper on lameness and reproductive performance in dairy cattle. Performance indicators on a dairy farm are very different. In this study which was conducted on 40 Holstein cows at one of Amol's dairy farms, some of these indicators include lameness, abortion; retained placenta and open days were studied. 360 mg zinc and 125 mg copper were added to rations of daily 20 heads of cattle (case group) daily for one year. Control group was given same diet without the supplement. Regular and seasonal blood sampling were done and serum levels of zinc and copper were analyzed. The results suggested that lameness (
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