Experiment 1 The determination of the digestibility of amino acids in corn-soybean diet for Peking ducks of 6 weeks of ageSixteen 6-week-old Peking ducks were housed in dividual cages.

• 试验一6周龄北京鸭玉米-豆粕型饲粮氨基酸消化率的测定选用6周龄平均体重接近,采食正常,健康的北京公鸭为试验鸭,8只用来测定基础日粮氨基酸消化率,另外8只测定内源氨基酸排泄量。