【摘要】 本研究用同一蛋白质和能量水平、不同脂肪和糖含量的饲料投喂试验青鱼，分别测定其在一天中氨氮、尿氮排泄量及耗氧量、CO2排出量，计算出用作能量消耗的蛋白质、脂肪和糖量。结果表明：当饲料中脂肪含量为0时，用作能量消耗的蛋白质为10．38毫克／克·日，当脂肪含量为12％时，用作能量消耗的蛋白质为5．78毫克／克·日，脂肪含量过低或过高（0或12％），均能引起饲料中用作能量消耗的蛋白质量的增加，从而导致氨排泄量的升高，分别为1．68毫克氮／克·日和0．93毫克氮／克·日，当脂肪含量为7％时，用作能量消耗的蛋白质部分最少，只有1．95毫克／克·日，氨的排泄量最低，只有0．31毫克氮／克·日。因此，饲料中适宜的能量、蛋白质、糖和脂肪含量，对蛋白质能起到较好的节约效果。更多还原

【Abstract】 The quantities of ammonnia-N, Urine-N excretion, oxgen consumption and CO2 production are measured for two-year fingerling of black carp (Mylopharyngodon piceus), whose average body weight is 10±2g. There are five groups, each group is fed with the different sorts of feeds containing same levels of energy and protein but different level of fat and carbohydrate. The amount of protein, fat and carbohydrate used for energy consumption was caculated. The result shows that the amount of protein, fat and carbohydrate used for energy if closely related to the nutrition composition of feed. Protein could be spared by adding proper amount of carbohydrate and fat. When the content of dietary fat is 0 and 12 %, the amount of protein used for energy consumption is 10. 38mg/g·day and 5. 78mg/g.day. While nitrogen excretion is 1. 66mg N/g·day and 0. 93mgN/g·day respectively. Hower the protein is only 1. 95mg/g·day, excreteed nitrogen is 0. 31mgN/g·day when the content of dietary fat is 7%. The experiment shows that the appropriate content of dietary fat and carbohydrate may decreases the consumption of protein used for energy.更多还原