| 摘要 |
A trace element solution includes at least the metals: zinc, manganese, selenium, and copper, and comprises a concentration of the metal(s) of at least 90 mg/ml. The solution may comprise the following concentrations: at least 60 mg/ml zinc; at least 10 mg/ml manganese; at least 5 mg/ml selenium; and at least 15 mg/ml copper. The solution may furthermore comprise chromium and iodine.
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