3Jost M F, Philipp , Kunz P. Reduction of Protein Content in Piglet Feed to Minimize Nitrogen Excretion, Rev [ J ]. Suisse Agric , 1993, 25(2) :109 -113.
4Hansen J A, Knabe D A, Burgoon K G. Amino Acid Supplementation of Low - Protein Sorghum - Soybean meal Diets for 5 - 20 kg Swine[J]. J Anita Sci,1993(71 ) :452 -458.
5Schutte J B, Weerden E J, Jong J. Tryptophan Requirement of Pigs in the Live Weight Period of 10 to 25 kg[ J ]. ILOB Report, 1989, 89:363 - 373.
6Li Y Z, Kerr B J, Kidd M T, et al. Use of Supplementary Tryptophan to Modify the Behavior of Pigs [ J ]. J Anim Sci ,2006,84:212 - 220.
8Peisker M, Simmins P H. Tryptophan as Feed Intake Stimu - Lant [J]. Feed Mix, 1998, 6:8 -12.
9Henry Y. Interactive Effects of Dietary Levels of Tryptophan and Protein on Voluntary Feed Intake and Growth Performance in Pigs in Relation to Plasma Free Amino Acid and Hypothalamic Serotonin [J].J Anita Sci, 1992, 70:1 873 -1 887 .
10Lee C Y, Bazer F W, Etherton T D, et al. Ontogeny of Insulin - Like Growth Factors ( IGF - Ⅰ and IGF - Ⅱ ) and IGF - Binding Proteins in Porcine Serum During Fetal and Postnatal Development [ J ]. Endocrinology, 1991, 128 : 2 336 - 2 344.
3Baker D H,Han Y.Ideal amino acid profile for broiler chicks during the first three weeks posthatching[J].Poultry Sci, 1994,73 : 1441-1447.
4Boomgaardt J,Baker D H.Tryptophan requirement of growing pigs at three levels of dietary protein[J].J Anita Sci, 1973,36 : 303 - 306.
5Burgoon K G,Knabe D A, Gregg E J.Digestible tryptophan requirements of starting, growing and finishing pigs[J] J Anim Sci, 1992,70 : 2493 - 2500.
6Chung T K,Baker D H.Ideal amino acid pattern for 10 kg pig[J].J Anita Sci,1992,70:3102 - 3111.
7Delhaye S ,Landry J.Quantitative determination of tryptophan in food and feedstuffs:practical considerations on autoclaving samples for hydrolysis[J].J Agric and Food Chem, 1993,41: 1633 - 1634.
8Fuller M F,DarcyvriUon B,Laplace J P,et al.The measurement of dietary amino-acid digestibility in pigs, rats and chickens-a comparison of methodologies[J].Anim Feed Sci Technol, 1994,48:305-324.
9Fuller M F,Mcwilliam R,Wang T C,et al.The optimal dietary amino acid pattern for growing pigs;Requirements for maintenance and for tissue protein accretion[J].Br J Nutr, 1989,62 : 255 - 263.
10Guzik A C,Southenr L L,Bidner D,et al.The tryptophan requirement of nursery pigs[J] J Am Sci, 2002,80: 2646 - 2655.
