[1] BOTTJE W,KONG B W.Cell biology symposium:feed efficiency:mitochondrial function to global gene expression[J].Journal of Animal Science,2013,91(4):1582-1593.

[2] KALMAR I D,VANROMPAY D,JANSSENS G P J.Broiler ascites syndrome:collateral damage from efficient feed to meat conversion[J].The Veterinary Journal,2013,197(2):169-174.

[3] CHENG H W,MUIR W M.Mechanisms of aggression and production in chickens:genetic variations in the functions of serotonin,catecholamine,and corticosterone[J].World's Poultry Science Journal,2007,63(2):233-254.

[4] CARVALHO R R,PALME R,DA SILVA VASCONCELLOS A.An integrated analysis of social stress in laying hens:the interaction between physiology,behaviour,and hierarchy[J].Behavioural Processes,2018,149:43-51.
[5] LV W J,WU X L,CHEN W Q,et al.The gut microbiome modulates the changes in liver metabolism and in inflammatory processes in the brain of chronic unpredictable mild stress rats[J].Oxidative Medicine and Cellular Longevity,2019,2019:7902874.
[6] MÜNGER E,MONTIEL-CASTRO A J,LANGHANS W,et al.Reciprocal interactions between gut microbiota and host social behavior[J].Frontiers in Integrative Neuroscience,2018,12:21.
[7] LYTE J M,LYTE M.Review:microbial endocrinology:intersection of microbiology and neurobiology matters to swine health from infection to behavior[J].Animal,2019,13(11):2689-2698.

[8] OBRENOVICH M E M.Leaky gut,leaky brain?[J].Microorganisms,2018,6(4):107.
[9] FORTE C,MOSCATI L,ACUTI G,et al.Effects of dietary
Lactobacillus acidophilus and
Bacillus subtilis on laying performance,egg quality,blood biochemistry and immune response of organic laying hens[J].Journal of Animal Physiology and Animal Nutrition,2016,100(5):977-987.

[10] QUIGLEY E M M.Prebiotics and probiotics in digestive health[J].Clinical Gastroenterology and Hepatology,2019,17(2):333-344.

[11] LI N N,WANG Q,WANG Y,et al.Oral probiotics ameliorate the behavioral deficits induced by chronic mild stress in mice via the gut microbiota-inflammation axis[J].Frontiers in Behavioral Neuroscience,2018,12:266.
[12] BAXTER M R.The welfare problems of laying hens in battery cages[J].The Veterinary Record,1994,134(24):614-619.

[13] GYURASZOVA M,KOVALCIKOVA A,GARDLIK R.Association between oxidative status and the composition of intestinal microbiota along the gastrointestinal tract[J].Medical Hypotheses,2017,103:81-85.
[14] ADEDOKUN S A,OLOJEDE O C.Optimizing gastrointestinal integrity in poultry:the role of nutrients and feed additives[J].Frontiers in Veterinary Science,2019,5:348.
[15] SARKODIE E K,ZHOU S X,BAIDOO S A,et al.Influences of stress hormones on microbial infections[J].Microbial Pathogenesis,2019,131:270-276.
[16] SHARMA S,TRIPATHI P.Gut microbiome and type 2 diabetes:where we are and where to go?[J].The Journal of Nutritional Biochemistry,2019,63:101-108.
[17] RIEDSTRA B,GROOTHUIS T G G.Early feather pecking as a form of social exploration:the effect of group stability on feather pecking and tonic immobility in domestic chicks[J].Applied Animal Behaviour Science,2002,77(2):127-138.

[18] RODENBURG T B,VAN KRIMPEN M M,DE JONG I C,et al.The prevention and control of feather pecking in laying hens:identifying the underlying principles[J].World's Poultry Science Journal,2013,69(2):361-374.

[19] 庄建明,曹庆华,曹文华,等.鸡啄癖病因、症状及防治[J].畜牧兽医科技信息,2019(11):145-146. ZHUANG J M,CAO Q H,CAO W H,et al.Causes,symptoms and prevention of pecking disorder in chickens[J].Chinese Journal of Animal Husbandry and Veterinary Medicine,2019(11):145-146.(in Chinese)
[20] DAIGLE C L,RODENBURG T B,BOLHUIS J E,et al.Individual consistency of feather pecking behavior in laying hens:once a feather pecker always a feather pecker?[J].Frontiers in Veterinary Science,2015,2:6.
[21] FOISTER S,DOESCHL-WILSON A,ROEHE R,et al.Social network properties predict chronic aggression in commercial pig systems[J].PLoS One,2018,13(10):e0205122.
[22] CHENG H W,MUIR W M.The effects of genetic selection for survivability and productivity on chicken physiological homeostasis[J].World's Poultry Science Journal,2005,61(3):383-397.

[23] BLAIR R J R.Psychopathy,frustration,and reactive aggression:the role of ventromedial prefrontal cortex[J].British Journal of Psychology,2010,101(3):383-399.

[24] GOODSON J L.The vertebrate social behavior network:evolutionary themes and variations[J].Hormones and Behavior,2005,48(1):11-22.

[25] KUENZEL W J.Research advances made in the avian brain and their relevance to poultry scientists[J].Poultry Science,2014,93(12):2945-2952.

[26] DIETL M,PALACIOS J M.Receptor autoradiography as a tool for the study of the phylogeny of the basal ganglia[J].Journal of Receptor Research,1988,8(1/2/3/4):521-532.
[27] COMAI S,TAU M,GOBBI G.The psychopharmacology of aggressive behavior:a translational approach:part 1:neurobiology[J].Journal of Clinical Psychopharmacology,2012,32(1):83-94.

[28] CHAOULOFF F.Regulation of 5-HT receptors by corticosteroids:where do we stand?[J].Fundamental & Clinical Pharmacology,1995,9(3):219-233.

[29] DAVIES S,BECK M L,SEWALL K B.Territorial aggression in urban and rural song sparrows is correlated with corticosterone,but not testosterone[J].Hormones and Behavior,2018,98:8-15.
[30] AHMED A A,MA W Q,NI Y D,et al.Embryonic exposure to corticosterone modifies aggressive behavior through alterations of the hypothalamic pituitary adrenal axis and the serotonergic system in the chicken[J].Hormones and Behavior,2014,65(2):97-105.

[31] YAMAGUCHI T,LIN D Y.Functions of medial hypothalamic and mesolimbic dopamine circuitries in aggression[J].Current Opinion in Behavioral Sciences,2018,24:104-112.
[32] EDENS F W.Agonistic behavior and neurochemistry in grouped Japanese quail[J].Comparative Biochemistry and Physiology Part A.Physiology,1987,86(3):473-479.

[33] DENNIS R L,CHENG H W.The dopaminergic system and aggression in laying hens[J].Poultry Science,2011,90(11):2440-2448.

[34] COSTA-PINTO F A,PALERMO-NETO J.Neuroimmune interactions in stress[J].Neuroimmunomodulation,2010,17(3):196-199.

[35] LIU Y,ZHAO J P,FAN X D,et al.Dysfunction in serotonergic and noradrenergic systems and somatic symptoms in psychiatric disorders[J].Frontiers in psychiatry,2019,10:286.
[36] CHARNEY M E,HELLBERG S N,BUI E,et al.Evidenced-based treatment of posttraumatic stress disorder:an updated review of validated psychotherapeutic and pharmacological approaches[J].Harvard Review of Psychiatry,2018,26(3):99-115.

[37] NIKULINA E M,BORODIN P M,POPOVA N K.Alteration of some forms of aggressive-behavior and content of monoamines in the brain in the process of selection by taming of wild rats[J].Zhurnal Vysshei Nervnoi Deyatelnosti Imeni I.P. Pavlova,1985,35(4):703-709.
[38] NIKULINA E M.Neural control of predatory aggression in wild and domesticated animals[J].Neuroscience & Biobehavioral Reviews,1991,15(4):545-547.

[39] POLETTO R,KRETZER F C,HÖTZEL M J.Minimizing aggression during mixing of gestating sows with supplementation of a tryptophan-enriched diet[J].Physiology & Behavior,2014,132:36-43.
[40] BIRKL P,FRANKE L,RODENBURG T B,et al.A role for plasma aromatic amino acids in injurious pecking behavior in laying hens[J].Physiology & Behavior,2017,175:88-96.
[41] CLEARE A J,BOND A J.Ipsapirone challenge in aggressive men shows an inverse correlation between 5-HT
1A receptor function and aggression[J].Psychopharmacology,2000,148(4):344-349.

[42] DE HAAS E N,VAN DER EIJK J A J.Where in the serotonergic system does it go wrong? Unravelling the route by which the serotonergic system affects feather pecking in chickens[J].Neuroscience & Biobehavioral Reviews,2018,95:170-188.
[43] PETROSUS E,SILVA E B,LAY JR D,et al.Effects of orally administered cortisol and norepinephrine on weanling piglet gut microbial populations and
Salmonella passage[J].Journal of Animal Science,2018,96(11):4543-4551.
[44] SUDO N,CHIDA Y,AIBA Y,et al.Postnatal microbial colonization programs the hypothalamic-pituitary-adrenal system for stress response in mice[J].The Journal of Physiology,2004,558(Pt 1):263-275.
[45] BRUCE-KELLER A J,SALBAUM J M,BERTHOUD H R.Harnessing gut microbes for mental health:getting from here to there[J].Biological Psychiatry,2018,83(3):214-223.

[46] AMBROSINI Y M,BORCHERDING D,KANTHASAMY A,et al.The gut-brain axis in neurodegenerative diseases and relevance of the canine model:a review[J].Frontiers in Aging Neuroscience,2019,11:130.
[47] FOSTER J A,RINAMAN L,CRYAN J F.Stress & the gut-brain axis:regulation by the microbiome[J].Neurobiology of Stress,2017,7:124-136.
[48] VILLAGELIŨ D N,LYTE M.Microbial endocrinology:why the intersection of microbiology and neurobiology matters to poultry health[J].Poultry Science,2017,96(8):2501-2508.

[49] BIRKL P,BHARWANI A,KJAER J B,et al.Differences in cecal microbiome of selected high and low feather-pecking laying hens[J].Poultry Science,2018,97(9):3009-3014.

[50] CHEN S Y,XIANG H,ZHANG H,et al.Rearing system causes changes of behavior,microbiome,and gene expression of chickens[J].Poultry Science,2019,98(9):3365-3376.

[51] VAN DER EIJK J A J,DE VRIES H,KJAER J B,et al.Differences in gut microbiota composition of laying hen lines divergently selected on feather pecking[J].Poultry Science,2019,98(12):7009-7021.

[52] CRYAN J F,DINAN T G.Mind-altering microorganisms:the impact of the gut microbiota on brain and behaviour[J].Nature Reviews Neuroscience,2012,13(10):701-712.

[53] KANTAK P A,BOBROW D N,NYBY J G.Obsessive-compulsive-like behaviors in house mice are attenuated by a probiotic (
Lactobacillus rhamnosus GG)[J].Behavioural Pharmacology,2014,25(1):71-79.

[54] CHENG H W,JIANG S,HU J Y.Gut-brain axis:probiotic,
Bacillus subtilis,prevents aggression via the modification of the central serotonergic system[M]//MAHMOUDI R.Oral health by using probiotic products.IntechOpen:Razzagh Mahmoudi,2019:1-32.
[55] WANG W C,YAN F F,HU J Y,et al.Supplementation of
Bacillus subtilis-based probiotic reduces heat stress-related behaviors and inflammatory response in broiler chickens[J].Journal of Animal Science,2018,96(5):1654-1666.

[56] KAELBERER M M,BUCHANAN K L,KLEIN M E,et al.A gut-brain neural circuit for nutrient sensory transduction[J].Science,2018,361(6408):eaat5236.
[57] PRADHANANGA S,TASHTUSH A A,ALLEN-VERCOE E,et al.Protease-dependent excitation of nodose ganglion neurons by commensal gut bacteria[J].The Journal of Physiology,2020,598(11):2137-2151.

[58] BUCKLEY M M,O'BRIEN R,BROSNAN E,et al.Glucagon-like peptide-1 secreting l-cells coupled to sensory nerves translate microbial signals to the host rat nervous system[J].Frontiers in Cellular Neuroscience,2020,14:95.
[59] HIRAMATSU K.Chicken intestinal L cells and glucagon-like peptide-1 secretion[J].The Journal of Poultry Science,2020,57(1):1-6.

[60] BRAVO J A,FORSYTHE P,CHEW M V,et al.Ingestion of
Lactobacillus strain regulates emotional behavior and central GABA receptor expression in a mouse via the vagus nerve[J].Proceedings of the National Academy of Sciences of the United States of America,2011,108(38):16050-16055.

[61] BERCIK P,PARK A J,SINCLAIR D,et al.The anxiolytic effect of
Bifidobacterium longum NCC3001 involves vagal pathways for gut-brain communication[J].Neurogastroenterology & Motility,2011,23(12):1132-1139.

[62] GAO K,MU C L,FARZI A,et al.Tryptophan metabolism:a link between the gut microbiota and brain[J].Advances in Nutrition,2020,11(3):709-723.

[63] SHEN Y B,VOILQUÉ G,ODLE J,et al.Dietary
L-tryptophan supplementation with reduced large neutral amino acids enhances feed efficiency and decreases stress hormone secretion in nursery pigs under social-mixing stress[J].The Journal of Nutrition,2012,142(8):1540-1546.

[64] XIE R N,JIANG P,LIN L,et al.Oral treatment with
Lactobacillus reuteri attenuates depressive-like behaviors and serotonin metabolism alterations induced by chronic social defeat stress[J].Journal of Psychiatric Research,2020,122:70-78.
[65] LIU W H,CHUANG H L,HUANG Y T,et al.Alteration of behavior and monoamine levels attributable to
Lactobacillus plantarum PS128 in germ-free mice[J].Behavioural Brain Research,2016,298:202-209.
[66] YOSHIDA J,ERWAN E,CHOWDHURY V S,et al.Comparison of centrally injected tryptophan-related substances inducing sedation in acute isolation stress-induced neonatal chicks[J].Pharmacology Biochemistry and Behavior,2015,129:1-6.
[67] YAN F F,WANG W C,CHENG H W.
Bacillus subtilis based probiotic improved bone mass and altered brain serotoninergic and dopaminergic systems in broiler chickens[J].Journal of Functional Foods,2018,49:501-509.
[68] VAN HIERDEN Y M,KOOLHAAS J M,KORTE S M.Chronic increase of dietary
L-tryptophan decreases gentle feather pecking behaviour[J].Applied Animal Behaviour Science,2004,89(1/2):71-84.
[69] ERNY D,DE ANGELIS A L H,JAITIN D,et al.Host microbiota constantly control maturation and function of microglia in the CNS[J].Nature Neuroscience,2015,18(7):965-977.

[70] ZHANG J M,SUN Y S,ZHAO L Q,et al.SCFAs-induced GLP-1 secretion links the regulation of gut microbiome on hepatic lipogenesis in chickens[J].Frontiers in Microbiology,2019,10:2176.
[71] CRYAN J F,O'RIORDAN K J,COWAN C S M,et al.The microbiota-gut-brain axis[J].Physiological Reviews,2019,99(4):1877-2013.

[72] LYTE M.Microbial endocrinology and the microbiota-gut-brain axis[M]//LYTE M,CRYAN J F.Microbial endocrinology:the microbiota-gut-brain axis in health and disease.New York:Springer,2014:3-24.
[73] MEIMANDIPOUR A,SOLEIMANI A F,HOUSHMAND M,et al.Effects of rough handling on short chain fatty acid production and gastrointestinal pH in broilers and modulatory role of
Lactobacilli[J].African Journal of Biotechnology,2011,10(74):17030-17037.
[74] TIAN P J,WANG G,ZHAO J X,et al.Bifidobacterium with the role of 5-hydroxytryptophan synthesis regulation alleviates the symptom of depression and related microbiota dysbiosis[J].Journal of Nutritional Biochemistry,2019,66:43-51.
[75] WESTFALL S,PASINETTI G M.The gut microbiota links dietary polyphenols with management of psychiatric mood disorders[J].Frontiers in Neuroscience,2019,13:1196.
[76] PEIRCE J M,ALVIÑA K.The role of inflammation and the gut microbiome in depression and anxiety[J].Journal of Neuroscience Research,2019,97(10):1223-1241.

[77] GADDE U D,OH S,LEE Y,et al.Dietary
Bacillus subtilis-based direct-fed microbials alleviate LPS-induced intestinal immunological stress and improve intestinal barrier gene expression in commercial broiler chickens[J].Research in Veterinary Science,2017,114:236-243.
[78] DENG W,DONG X F,TONG J M,et al.The probiotic
Bacillus licheniformis ameliorates heat stress-induced impairment of egg production,gut morphology,and intestinal mucosal immunity in laying hens[J].Poultry Science,2012,91(3):575-582.

[79] CHANG C H,TENG P Y,LEE T T,et al.The effects of the supplementation of multi-strain probiotics on intestinal microbiota,metabolites and inflammation of young SPF chickens challenged with
Salmonella enterica subsp. enterica[J].Animal Science Journal,2019,90(6):737-746.

[80] CHUNCHAI T,THUNAPONG W,YASOM S,et al.Decreased microglial activation through gut-brain axis by prebiotics,probiotics,or synbiotics effectively restored cognitive function in obese-insulin resistant rats[J].Journal of Neuroinflammation,2018,15(1):11.
[81] SAMARTGIS J R,SCHACHTE L,HAZI A,et al.Brain-derived neurotrophic factor facilitates memory consolidation and reconsolidation of a weak training stimulus in the day-old chick[J].Neuroscience Letters,2012,516(1):119-123.

[82] LORIA M J,WHITE S W,ROBBINS S A,et al.Brain-derived neurotrophic factor response in vulnerable and resilient genetic lines in the chick anxiety-depression model[J].Behavioural Brain Research,2013,245:29-33.
[83] MAQSOOD R,STONE T W.The gut-brain axis,BDNF,NMDA and CNS disorders[J].Neurochemical Research,2016,41(11):2819-2835.

[84] TIAN P J,ZOU R Y,SONG L H,et al.Ingestion of
Bifidobacterium longum subspecies infantis strain CCFM687 regulated emotional behavior and the central BDNF pathway in chronic stress-induced depressive mice through reshaping the gut microbiota[J].Food & Function,2019,10(11):7588-7598.

[85] RANUH R,ATHIYYAH A F,DARMA A,et al.Effect of the probiotic
Lactobacillus plantarum IS-10506 on BDNF and 5HT stimulation:role of intestinal microbiota on the gut-brain axis[J].Iranian Journal of Microbiology,2019,11(2):145-150.