本試驗目的係建立綠頭鴨在換羽期間之正常血清電解質數值及性別之間差異。綠 頭鴨共 40 隻，在 5 月至 10 月之換羽期間採血，以分析其血清電解質離子濃度。 試驗結 果顯示雄及雌綠頭鴨血清鈣濃度介於 7.59 ﹣ 14.54 mg ╱ dL； 血清磷濃度介於 2.5 ﹣ 8.7 mg ╱ dL； 血清鎂離子濃度介於 2.81 ﹣ 3.80 mg ╱ dL； 血清鈉離子濃度介於 147.51 ﹣ 155.18 mmol ╱ L；血清氯離子濃度介於 110.15 ﹣ 111.87 mmol ╱ L； 血清 鉀離子濃度介於 2.50 ﹣ 6.47 mmol ╱ L。 綠頭鴨之血清鈣、磷、鎂、鉀、鈉與氯離子濃 度隨月份之不同而改變。在 5 ﹣ 7 月雄綠頭鴨換羽期間與雌綠頭鴨之血清鈣、磷、鎂與鉀 離子濃度顯著高於雄鴨（ P ＜ 0.05 ）。

　　　　　The aim of this study was to characterize and compare the levels of serum electrolyte on male and female mallards at moult. Forty mallards (25 male, 15 female) were used in this experiment and blood samples were collected from May to October, 1998. The results showed that the range of calcium, phosphorous, magnesium, sodium, chloride and potassium concentrations in serum were 7.59-14.54 mg/dL, 2.5-8.7 mg/dL, 2.81-3.80 mg/dL, 147.51-155.18 mmol/L, 110.15-111.87 mmol/L and 2.50-6.47 mmol/L, respectively. The calcium and phosphorous concentrations changed significantly by month (P<0.05). At moult period from May to July, the serum concentration of calcium and phosphorous, magnesium, and potassium of male mallards were greater than those of female mallards (P<0.05).