Selenium (Se) deficiency is documented in several species of wild ruminant animals in California. Because it has been shown that Se intrarumenal pellet supplementation of mule deer (Odocoileus hemiorus) docs can triple fawn survivability, we collected limited pilot data on the consumption of several formulations of livestock range blocks and loose mineral by deer. Our experience indicated little opportunity for Se supplementation of deer by this route. We were unable to identify ingredients that fostered measurable consumption. The safety and efficacy of using a commercially produced Se fertilizer (1% Se as selenate) on deer browse was also evaluated as a means of elevating Se in the diet. On our limited plots, Se fertilizer was effective at elevating Se content of deficient forage to efficacious levels when applied at 1 kg/ha . When applied at 4 kg/ha, Se uptake from fertilization remained below the minimal toxicity level. Larger scale fertilizer work with browse is in progress. Opportunities exist for further research into improving fawn survivability by Se supplementation.
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