本試驗的目的旨在探討當環境溫度偏高時添加皂化脂肪對乳牛早期泌乳性狀之影響 。20頭荷蘭母牛（14頭初產，6頭經產）依分娩日期逢機分配至2個處理組，分別餵予不同試 驗飼糧；對照組與添加4.5%皂化脂肪之試驗組，試驗期間為12週。結果顯示：添加皂化脂肪 提高乳量7.9%及3.5%乳脂校正乳量7%，但統計上並不顯著，而添加脂肪對牛乳的組成分並無 影響。在攝食量方面，無論是乾物質、中洗纖維或是酸洗纖維，脂肪添加組均有較高的趨勢 ，唯差異有限，且均有可能來自因應乳量調整所增加的精料採食量。對照組與脂肪添加組在 試驗期結束時的體重相若，代表牛隻在熱緊迫狀態下可有效利用外源性脂肪的添加來維持泌 乳。

　　　　　The purpose of this study was to investigate the influence of supplemented Calcium soap on milking traits of postpartum dairy cows under heat stress. 20 Holstein cows(14 primiparous and 6 multiparous) were randomly assigned, by calving date, to either control or fat-supplemented group (4.55% Megalac). Both groups received the same basal diet, and the experiment lasted 12 weeks. The results showed that the mailk yield and 3.5% FCM were increased 7.9% and 7% respectively, but the milk composition was not affected by fat supplementation. Intakes of DM and NDF were tended to increase by the fat addition, mainly because the increase in concentrate intake, since concentrate, was fed according to milk production. The body weight had few changes during peak performance, but it become lighter towards the end of study. This implies that cattle can unilize the fat as a source of energy to maintain the lactation. It was concluded that, dietary added Calcium salts of fatty acids can be the energy source to maintain the normal laction curve under heat stress.