【摘要】 试验用两个能量水平的日粮（１１．７１ＭＪ／ｋｇ和１２．５５ＭＪ／ｋｇ）分别饲喂芙蓉瘦肉鸭１２羽，采用全收粪法对肉鸭１８～２１，３２～３５，４６～４９日龄三个阶段各种日粮的代谢能、能量代谢率、干物质消化率、氮沉积和氨基酸表观消化率进行了测定。结果表明：１．日粮代谢能实测值均大于计算值（４．０６％～１０．９３％）；高能日粮（简称ＨＥ）比低能日粮（简称ＬＥ）的代谢能计算值更接近于实测值；２．随肉鸭日龄的增大，后期氮的沉积率显著降低（Ｐ＜０．０１），干物质消化率和能量代谢率有所提高（Ｐ＞０．０５）；３．提高日粮能量浓度后，干物质消化率显著提高（Ｐ＜０．０５），能量代谢率和氮沉积率稍有提高（Ｐ＞０．０５）；４．受测氨基酸中，蛋氨酸的表观消化率最高，提高日粮能量浓度后，赖氨酸表观消化率，前、后期显著提高（Ｐ＜０．０５），中期略有降低（Ｐ＞０．０５），胱氨酸表观消化率前期显著提高（Ｐ＜０．０５），中、后期无显著影响（Ｐ＞０．０５）。更多还原

【Abstract】 An experiment was conducted with 12 Furong ducklings to determine the metabolizable energy(ME), dry matter(DM) digestibility, nitrogen retention(NR) and apparent digestibility(AD) of amino acids in duck diets during three periods(18-21, 32-35 and 46-49 days of age)using total feces collection method. The ducks were fed on various diets with low energy(LE) and high energy(HE) levels, respectively. The results showed that: 1. the measured values of ME in duck diets were higher than the calculated values,the measured values in HE diets were closer to calculated values,when compared with LE diets; 2. as the ducks aged, the NR decreased significantly(P<0. 05), but the DM digestibility and energy metabolizability increased(P<0. 01 ); 3. when the dietary energy increased,the DM digestibility increased significantly(P<0. 05),but the energy metabolozability and NR increased(P>0. 05) slightly; 4. the AD of methionine was the highest among the amino acids tested ; and when the dietary energy increased,the AD of lysine increased significantly(P<0. 05)in 0-21 and 36-49 days of age,but decreased slightly(P>0. 05) in 22-35 days of age;in the meantime, the AD of cystine increased significantly(P<0. 05)only in 0-21 days of age,and was not affected significantly(P>0. 05)in 22-35 and 36-49 days of age.更多还原