| These experiments study the digestible ideal amino acid profile for the duck during the Brood time. It can as a theoretical base for the amino acid requirements of the duck nutrition requirement, applied for the practice reference for the reasoned utilize the protein feeds resource becoming more and more rarely .Experiment 1: Determination on the based dietary digestibility of the amino acidSelected the reproach average body weight, formly feeds intake , health of the 16 ducks . 8 ducks was used to determine the digestive of the based dietary, and the rest 8 ducks to determine the endogenous of the amino acid ,used the way of the true metabolisable energy to determine the digestibility of the amino acid . The amino acid to be determined include Lysine (Lys),methionine (Met), threonine (Thr), Trptophan (Trp), isoleucine(Ile) .The result are shown: the apparament digestibility of Lys, Met, Thr, Trp, He is 74. 16%, 80. 15%, 64. 14%, 87. 21%, 69. 99%, and the ture digestibility of Lys,Met, Thr, Trp, Iie is 92. 82%, 95. 68%, 90. 97%, 89. 58%, 88.08%= Experiment 2: Studies on the ideal proportion of the Lys, Met,Trp.This experiment studies on the ideal proportion of the Lys, Met, Trp. Assigned in 3X3 factorial arrangement. Lys, Met, Trp as three factors .Every factor is individually added three different levels . Therefore , there are 27 groups. Each group has three replicates and 14 ducks in each replicate with equal number of males and females. The level of the Lys is 0.95%, 1. 10%, 1.25% ; The level of Met is 0. 26%, 0. 46%, 0. 66%; The level of the Thr is 0. 20%, 0. 30, 0. 40%o The experiment results indicated that :l)There is not interaction among the lys , Met , Trp in the corn-soybean-peanut meal(CP: 20.26%) in 0-2 weeks. 2)The ideal added level of Lys,Met are 1. 10% and 0. 46%, which can apply for the growth for the duck. 3) Added the Trp could not effect the body weight , dietary intake, body gain , and so on . Experiment 3: Studies on the ideal proportion of the Trp, Thr, lie.This experiment studies on the ideal proportion of the Trp, Thr, Ile. Assigned in 3X3 factorial arrangement. Trp, Thr, Ile as three factors .Every factor is individually added three different levels .There are 27 experiment and one control groups. Each group has three replicates and 14 ducks in each replicate with equal number of males and females. Added level of Lys, Met are 1.10% and 0.46%. The level of theThr is 0. 70%, 0. 80%, 0. 90%; The level of the Ile is 0. 70%, 0. 80%, 0. 90%; The level of the Trp is 0. 25%, 0. 30, 0. 35%0 The experiment results indicated that :l)The body weight in the 14 days and 21 days, feed:gain in 14 days and 21 days, the average intake are not significantly (p>0. 05). The reason is high of the CP: 20. 26% or The level of the amino acid is high in the base dietary. 2) There is not interaction among the Thr , He, Trp in the corn-soybean-peanut meal(CP: 20.26%) .There is not significantly between the experiment group and the control group.Experiment 4: Studies on the ideal proportion of the Trp, Thr, lie in the low protein dietary.This experiment studies on the ideal proportion of the Trp, Thr, He. Assigned in 3X3 factorial arrangement. Trp, Thr, Ile as three factors .Every factor is individually added three different levels in the low protein dietary( CP 16.04%). There are 27 experiment groups and one control group. Each group has three replicates and 14 ducks in each replicate with equal number of males and females. Added level of Lys.Met are 1. 10% and 0. 46%. The level of the Thr is 0. 63%, 0. 73%,0.83%; The level of the He is 0. 63%, 0. 73%, 0. 83%; The level of the Trp is 0. 19%, 0. 24%, 0. 29%. The experiment results indicated that : 1)The body weight in the 14 days and 21 days, feed:gain in 14 days and 21 days, the average intake are not significantly (p>0. 05) under the level of the Thr and Ile. The amount of the Thr 0. 5272%, Ile0. 5327% in the based dietary can apply for growth . The 0.24% level of Trp that can significantly effects on the body weight in the 21days is better t...
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