peer reviewed ; Beef cattle are susceptible to trace element deficiencies. The goal of this trial was to study the efficacy of dam supplementation with organic or inorganic trace minerals. Thirteen Belgian Blue farms divided into two groups per farm were investigated, resulting in a randomized block design, with two treatments. Animals in treatment A group received a supplement containing 50% organic and 50% inorganic selenium, zinc, and copper, while those in treatment B group received 100% inorganic sources. Blood zinc (p=0.08), selenium in blood (p<0.01) and colostrum (p<0.01) were higher in group A. No difference (p>0.1) was found between treatments regarding the incidence of disease or daily weight gain of the calves. Although the zootechnical performance was equal for both treatments, supplementation with organic trace minerals resulted in a greater nutritional efficacy to sustain the selenium and zinc statuses of the Belgian Blue cattle, and also seemed to mitigate inflammation associated with cesarean section.