本研究目的係探討熱季環境曝曬下飲水中添加氯化鉀與水浴對白色菜鴨血漿電解質濃度及體溫之影響。本研究分二個試驗進行，試驗一：母白色菜鴨分為對照組及氯化鉀試驗組，各10隻共20隻。試驗組鴨隻在試驗前2天給予添加1%氯化鉀之飲用水，試驗初始二個處理組鴨隻分別在室外陽光曝曬後第0小時及第2小時，共2個時間點以紅外線溫度熱像儀測量其體溫，並從翼靜脈採血以進行血漿鈉、鉀及氯離子濃度之分析。試驗二：12隻白色菜鴨，分別在多雲及晴天室外曝曬後給予水浴，並測量水浴前後其臉部溫度及直腸溫度，試驗分別進行5及6小時。結果顯示，試驗一於飲水中添加氯化鉀對白色菜鴨於日曝曬下體溫變化及血漿鈉與氯離子濃度有影響，而血漿鉀離子濃度及體溫與對照組在二個處理組之間無顯著的影響；然而試驗二中菜鴨於日曝曬後給予水浴，其臉部溫度、直腸溫度則有顯著下降（P<0.05）。綜上所述，鴨隻在日曝曬後給予水浴相較於鴨飲水中添加氯化鉀對於白色菜鴨受熱緊迫之緩解有較為明顯效果，且也較符合動物福利。

This study aimed to investigate the effects of supplementation of potassium chloride in drinking water and bathing in water on the changes of plasma electrolytes and body temperatures of white-feathered Tsaiya ducks under exposure to sunlight during the hot season. In Experiment 1, the white Tsaiya ducks were allotted into two groups; the control and test group, each with 10 ducks. In the test group, two days prior to D1, drinking water supplemented with 1% KCl was provided to the ducks. Ducks in the two groups were exposed to the sun for 0 and 2 hours and subjected to body temperature check by infrared temperature thermal imaging camera. Blood samples collected from the wing veins were examined for the serum sodium, potassium and chloride ion concentrations. In Experiment 2, 12 white-feathered Tsaiya ducks were given water baths after outdoor exposure on cloudy and sunny days, and their facial and rectal temperatures were measured before and after the water baths. The experiments were conducted for 5 and 6 hours respectively. Our results showed that in Exp. 1 supplementation of KCl in drinking water had effects to some extent on serum sodium and chloride ion concentrations in white-feathered Tsaiya ducks exposed to the sun, yet showed no effects on body temperature changes and serum potassium as compared to the control group. In Exp. 2, taking a pond bath after sun exposure could significantly lower the facial temperature as well as rectal temperature (P<0.05). Taken together, the heat stress during hot seasons experienced by the white-feathered Tsaiya ducks after sun exposure could be better alleviated from the pond bathing than from the supplementation of KCl in drinking water, also a practical outcome for animal welfare.