[1] KERR B J,EASTER R A.Effect of feeding reduced protein, amino acid-supplemented diets on nitrogen and energy balance in grower pigs[J].Journal of Animal Science,1995,73(10):3000-3008.

[2] WANG Y M,ZHOU J Y,WANG G,et al.Advances in low-protein diets for swine[J].Journal of Animal Science and Biotechnology,2018,9:60.
[3] PHONGTHAI S,D'AMICO S,SCHOENLECHNER R,et al.Fractionation and antioxidant properties of rice bran protein hydrolysates stimulated by
in vitro gastrointestinal digestion[J].Food Chemistry,2018,240:156-164.
[4] 王钰明.日粮蛋白质水平对猪肠道营养物质消化代谢的影响及机制研究[D].博士学位论文.北京:中国农业大学,2020. WANG Y M.Effects and mechanisms of dietary crude protein level on intestinal nutrient digestion and metabolism in pigs[D].Ph. D.Thesis.Beijing:China Agricultural University,2020.(in Chinese)
[5] HE L Q,WU L,XU Z Q,et al.Low-protein diets affect ileal amino acid digestibility and gene expression of digestive enzymes in growing and finishing pigs[J].Amino Acids,2016,48(1):21-30.

[6] HEINRITZ S N,WEISS E,EKLUND M,et al.Intestinal microbiota and microbial metabolites are changed in a pig model fed a high-fat/low-fiber or a low-fat/high-fiber diet[J].PLoS One,2016,11(4):e0154329.
[7] SHARMA M,WASAN A,SHARMA R K.Recent developments in probiotics:an emphasis on
Bifidobacterium[J].Food Bioscience,2021,41:100993.
[8] VAN DEN ABBEELE P,BELZER C,GOOSSENS M,et al.Butyrate-producing
Clostridium cluster XIVa species specifically colonize mucins in an
in vitro gut model[J].The ISME Journal,2013,7(5):949-961.

[9] ORMEROD K L,WOOD D L A,LACHNER N,et al.Genomic characterization of the uncultured
Bacteroidales family S24-7 inhabiting the guts of homeothermic animals[J].Microbiome,2016,4(1):36.
[10] TILOCCA B,BURBACH K,HEYER C M E,et al.Dietary changes in nutritional studies shape the structural and functional composition of the pigs'fecal microbiome-from days to weeks[J].Microbiome,2017,5(1):144.
[11] ROSE W C,SMITH L C,WOMACK M,et al.The utilization of the nitrogen of ammonium salts, urea, and certain other compounds in the synthesis of non-essential amino acids
in vivo[J].The Journal of Biological Chemistry,1949,181(1):307-316.

[12] DEGUCHI E,NAMIOKA S.Synthesis ability of amino acids and protein from non-protein nitrogen and role of intestinal flora on this utilization in pigs[J].Bifidobacteria and Microflora,1989(8):1-12.
[13] MANSILLA W D,COLUMBUS D A,HTOO J K,et al.Nitrogen absorbed from the large intestine increases whole-body nitrogen retention in pigs fed a diet deficient in dispensable amino acid nitrogen[J].The Journal of Nutrition,2015,145(6):1163-1169.

[14] MANSILLA W D,HTOO J K,DE LANGE C F M.Nitrogen from ammonia is as efficient as that from free amino acids or protein for improving growth performance of pigs fed diets deficient in nonessential amino acid nitrogen[J].Journal of Animal Science,2017,95(7):3093-3102.
[15] MANSILLA W D,SILVA K E,ZHU C L,et al.Ammonia-nitrogen added to low-crude-protein diets deficient in dispensable amino acid-nitrogen increases the net release of alanine,citrulline,and glutamate post-splanchnic organ metabolism in growing pigs[J].The Journal of Nutrition,2018,148(7):1081-1087.
[16] LI P L,WU F,WANG Y M,et al.Combination of non-protein nitrogen and N-carbamylglutamate supplementation improves growth performance,nutrient digestibility and carcass characteristics in finishing pigs fed low protein diets[J].Animal Feed Science and Technology,2021,273:114753.
[17] WU X,RUAN Z,GAO Y L,et al.Dietary supplementation with
L-arginine or N-carbamylglutamate enhances intestinal growth and heat shock protein-70 expression in weanling pigs fed a corn-and soybean meal-based diet[J].Amino Acids,2010,39(3):831-839.

[18] ZHANG H,PENG A,YU Y,et al.N-Carbamylglutamate and
L-arginine promote intestinal absorption of amino acids by regulating the mTOR signaling pathway and amino acid and peptide transporters in suckling lambs with intrauterine growth restriction[J].The Journal of Nutrition,2019,149(6):923-932.

[19] DAI Z L,LI X L,XI P B,et al. Regulatory role for
L-arginine in the utilization of amino acids by pig small-intestinal bacteria[J].Amino Acids,2012,43(1):233-244.

[20] WU G Y,KNABE D A,KIM S W.Arginine nutrition in neonatal pigs[J].The Journal of Nutrition,2004,134(10 Suppl):2783S-2790S.
[21] 赵元,何立荣,李金林,等.低蛋白质日粮添加N-氨甲酰谷氨酸、维生素A对育肥猪肉品质的影响[J].中国饲料,2016(21):12-17. ZHAO Y,HE L R,LI J L,et al.Effects of N-carbamylglutamic acid and vitamin A supplementation on fattening pork quality in low-protein diets[J].China Feed,2016(21):12-17.(in Chinese)
[22] YE C C,ZENG X Z,ZHU J L,et al.Dietary N-carbamylglutamate supplementation in a reduced protein diet affects carcass traits and the profile of muscle amino acids and fatty acids in finishing pigs[J].Journal of Agricultural and Food Chemistry,2017,65(28):5751-5758.

[23] 孙卫.低蛋白质日粮添加N-氨甲酰谷氨酸对生长育肥猪生长性能的影响[D].硕士学位论文.北京:中国农业大学,2019. SUN W.Effects of N-carbamylglutamate on the growth performance of growing-finishing pigs fed low-protein diets[D].Master's Thesis.Beijing:China Agricultural University,2019.(in Chinese)
[24] 周俊言.低蛋白质日粮淀粉组成改善生长猪氮利用效率的机制研究[D].博士学位论文.北京:中国农业大学,2022. ZHOU J Y.Exploring the mechanism of starch composition in low-protein diets to improve nitrogen efficiency of growing pigs[D].Ph. D.Thesis.Beijing:China Agricultural University,2022.(in Chinese)
[25] FUJITA S,DREYER H C,DRUMMOND M J,et al.Nutrient signalling in the regulation of human muscle protein synthesis[J].The Journal of Physiology,2007,582(2):813-823.

[26] ROOS S,LAGERLÖF O,WENNERGREN M,et al.Regulation of amino acid transporters by glucose and growth factors in cultured primary human trophoblast cells is mediated by mTOR signaling[J].American Journal of Physiology Cell Physiology,2009,297(3):C723-C731.
[27] DIMITRIADIS G,MITROU P,LAMBADIARI V,et al.Insulin effects in muscle and adipose tissue[J].Diabetes Research and Clinical Practice,2011,93 Suppl 1:S52-S59.
[28] MAO X B,ZENG X F,HUANG Z M,et al.Leptin and leucine synergistically regulate protein metabolism in C2C12 myotubes and mouse skeletal muscles[J].The British Journal of Nutrition,2013,110(2):256-264.

[29] TESTER R F,KARKALAS J,QI X.Starch-composition,fine structure and architecture[J].Journal of Cereal Science,2004,39(2):151-165.

[30] ZHOU J Y,WANG L,ZHOU J C,et al.Effects of using cassava as an amylopectin source in low protein diets on growth performance,nitrogen efficiency,and postprandial changes in plasma glucose and related hormones concentrations of growing pigs[J].Journal of Animal Science,2021,99(12):skab332.
[31] ZHENG L F,ZUO F R,ZHAO S J,et al.Dietary supplementation of branched-chain amino acids increases muscle net amino acid fluxes through elevating their substrate availability and intramuscular catabolism in young pigs[J].The British Journal of Nutrition,2017,117(7):911-922.

[32] WU G.Intestinal mucosal amino acid catabolism[J].The Journal of Nutrition,1998,128(8):1249-1252.

[33] YIN F G,ZHANG Z Z,HUANG J,et al.Digestion rate of dietary starch affects systemic circulation of amino acids in weaned pigs[J].The British Journal of Nutrition,2010,103(10):1404-1412.

[34] MAO Z,ZHANG W Z.Role of mTOR in glucose and lipid metabolism[J].International Journal of Molecular Sciences,2018,19(7):2043.
[35] SASAKI T,YASUI T,MATSUKI J.Effect of amylose content on gelatinization, retrogradation, and pasting properties of starches from waxy and nonwaxy wheat and their F1 seeds[J].Cereal Chemistry,2000,77(1):58-63.