• 作者： 吳春利; 楊清白
• 作者服務機構： 國立臺灣大學畜牧學系
• 中文摘要： 本文的五個試驗，用來研究年齡及飼養條件對土蕃鴨蛋白質消化之影響。試驗一是用成熟土蕃鴨手術人工肛門法來證明化學分離伕，在研究土蕃鴨之蛋白質消化是可行的。試驗二是不同蛋白質量對雛鴨蛋白質消化之影響，當飼料中蛋白質提高時，蛋白質的消化率輕微的下降，而氮貯積率減低很明顯。試驗三是 18% 與 20% 蛋白質和用 2,300，2,800 與 3,300 kcal/kg 代謝能，飼料中蛋白質含量不變，增加飼料能量，對蛋白質消化率及氮貯積率提高，氮貯積率提高較蛋白質消化率更明顯。試驗四是用限制量採食 100%，80% 及 60%，對蛋白質消化利用，限制採食量只能提高氮貯積率。試驗五是年齡對蛋白質消化利用之影響，結果指出，蛋白質消化率，隨著年齡增加而緩慢減低，而氮貯積率下降很明顯。
• 英文摘要： Five experiments were conducted to studythe effects of age and feeding conditions on thedigestibility of protein in mule ducks. Experimentl was used to demonstrate that the chemicalmethod may be used in place of the surgicalmethod in studying the digestibility of protein.Experiment 2 was used to study the influencesof various levels of protein on the digestibilityof protein. When the protein level of the dietwas increased, there was a slight decrease inthe digestibility of protein; nitrogen retentionwas seriously decreased. Experiment 3 was afactorial desgin with 2 levels of protein (18 and20%) and 3 levels of metabolizable energy (2300,2800 and 3300 kcal/kg). Increasing the me-tabolizable energy in diet increased the diges-tibility of protein and nitrogen retention iniso-protein diet. Increased nitrogen retentionwas greater than the digestibility of protein.Experiment 4 was conducted to give the restrictedfeed intake 100, 80 and 60%. The results in-dicated that the restricted feed intake was in-creased in nitrogen retention only. Experiment5 was used to study the effect of age on thedigestibility and utilization of protion of protein.The results showed that increased age decreasedthe digestibility of protein and nitrogen retention.Decreased nitrogen retention was much greaterthan protein digestibility.
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