Journal of Poultry Science最新文献

{"title":"Effects of Polysaccharides-Rich Extract from <i>Gracilaria lemaneiformis</i> on Growth Performance, Antioxidant Capacity, Immune Function, and Meat Quality in Broiler Chickens.","authors":"Shengwang Jiang,&nbsp;Chaoyun Yang,&nbsp;Yintao Xiao,&nbsp;Saizhen Zheng,&nbsp;Qian Jiang,&nbsp;Jiashun Chen","doi":"10.2141/jpsa.2023018","DOIUrl":"https://doi.org/10.2141/jpsa.2023018","url":null,"abstract":"<p><p>This study investigated the effects of dietary supplementation with <i>Gracilaria lemaneiformis</i> polysaccharides (GLPs) on the growth performance, antioxidant capacity, immune function, and meat quality of broiler chickens. A total of 320 one-day-old Arbor Acres broiler chicks were individually weighed and randomly assigned to four groups of eight replicate cages (10 broilers per cage). Birds were fed a basal diet supplemented with 0 (control), 1,000, 2,000, or 4,000 mg/kg GLPs. Compared to that of the control group, dietary supplementation with 2,000 mg/kg GLPs linearly increased the average daily weight gain during days 0-42 (<i>P</i> < 0.05) and linearly decreased the feed to gain ratio during days 1-21 and 22-42 (<i>P</i> < 0.05). Broilers fed GLP-supplemented diets showed linear (<i>P</i> < 0.05) and quadratic (<i>P</i> < 0.05) increases in serum superoxide dismutase (<i>P</i> < 0.05), glutathione peroxidase, and catalase activities in the liver, whereas GLP supplementation decreased serum and liver malondialdehyde concentrations (<i>P</i> < 0.05). A linear increase in serum catalase activity was observed following supplementation with 2,000 or 4,000 mg/kg GLPs (<i>P</i> < 0.05). Broilers fed GLP-supplemented diets showed linear (<i>P</i> < 0.05) and quadratic (<i>P</i> < 0.05) increases in serum immunoglobulin (Ig) A, IgG, interleukin (IL)-6, IL-1β, IL-10, and interferon-γ concentrations (<i>P</i> < 0.05), and a trend towards linear improvement in IL-4 levels (<i>P</i> = 0.089). Dietary GLP supplementation increased the <i>Lactobacillus</i> spp. population compared to that of the control group (<i>P</i> < 0.05) and 2,000 and 4,000 mg/kg of GLPs nearly decreased the population of <i>E. coli</i> in the cecum (<i>P</i> = 0.056). Therefore, dietary GLP supplementation may improve broiler growth performance by altering antioxidant capacity, immune function, and the gut microbiota composition. Considering the effects of different doses of GLP on the above parameters, 2,000 mg/kg of GLPs was identified as the best dose.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023018"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/72/9a/jpsa-60-2023018.PMC10363415.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9861405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Historical Overview of Poultry in Japan.","authors":"Atsushi Tajima","doi":"10.2141/jpsa.2023015","DOIUrl":"https://doi.org/10.2141/jpsa.2023015","url":null,"abstract":"<p><p>To meet the strong quantitative demands for poultry products with high sanitary standards soon after World War II, the Japanese poultry industry experienced a rapid expansion period. However, it should be remembered that the post-war flourishment of the Japanese poultry industry was built on a solid academic and educational platform that took several pre-war decades to construct. In addition, poultry play a special cultural role in Japanese society. In this review, poultry in Japan is illustrated from the following three historical viewpoints: 1) development of the Japanese poultry industry; 2) academic and educational contributions to the poultry industry in Japan; and 3) ritualistic, mythic, and artistic attributes of poultry that are deeply embedded in Japanese society.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023015"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/09/81/jpsa-60-2023015.PMC10293860.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9793558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RNA-sequencing Reveals Differentially Expressed Genes of Laying Hens Fed Baihu Decoction Under Heat Shock.","authors":"Tingting Lu,&nbsp;Lihong Li,&nbsp;Yuwei Li,&nbsp;Xianghui Li","doi":"10.2141/jpsa.2023012","DOIUrl":"https://doi.org/10.2141/jpsa.2023012","url":null,"abstract":"<p><p>Egg production, an important economic trait in the poultry industry, is sensitive to heat stress. The hypothalamus is a crucial center for thermoregulation by detecting temperature changes and regulating the autonomic nervous system in poultry. Baihu decoction (BH), which contains four ingredients (<i>Rhizoma Anemarrhenae</i>, <i>Gypsum Fibrosum</i>, <i>Radix Glycyrrhizae</i>, and <i>Semen Oryzae Nonglutinosae</i>), is a traditional Chinese medicinal formula for clearing heat. Our study aimed to investigate the changes in gene transcription levels in the hypothalamus of laying hens treated with heat stress with and without BH using RNA sequencing. A total of 223 differentially expressed genes (DEGs) were identified in the heat-treated group compared with the control group and 613 DEGs were identified in the BH group compared with the heat-treated group. Heat shock led to significant changes in the expression of multiple genes involved in the \"neuroactive ligand-receptor interaction\" pathway. Moreover, feeding BH led to significant upregulation in the expression of eight genes encoding heat shock proteins (HSPs), which were highlighted as candidates to control the \"protein processing in the endoplasmic reticulum (ER)\" pathway. These results provide the novel insight that BH responds to heat stress by participating in regulation of the ER signaling pathway and HSPs expression.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023012"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/19/93/jpsa-60-2023012.PMC10189359.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9503304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Dietary <i>Gelsemium elegans</i> Benth. Extract on the Growth, Slaughter Performance, Meat Quality, Intestinal Morphology, and Microflora of Yellow-Feathered Chickens.","authors":"Yu-Hang Cao,&nbsp;Ting-Ting Chen,&nbsp;Xiong Peng,&nbsp;Rong-Rong Wu,&nbsp;Xiang Li,&nbsp;Gao-Feng Liu,&nbsp;Li-Xia Shen,&nbsp;Xiao-Jun Chen,&nbsp;Zi Yang,&nbsp;Zhao-Ying Liu,&nbsp;Zhi-Liang Sun,&nbsp;Yong Wu","doi":"10.2141/jpsa.2023023","DOIUrl":"https://doi.org/10.2141/jpsa.2023023","url":null,"abstract":"<p><p>The plant species <i>Gelsemium elegans</i> Benth. (GEB) promotes pig and sheep growth; however, little is known about its effects in chickens. In this study, a GEB extract (GEBE) was prepared, and its effects on the growth, slaughter, antioxidant performance, meat quality, serum biochemical indices, intestinal morphology, and microflora of yellow-feathered chickens were evaluated. In total, 600 chickens aged 15 days were randomly divided into four groups with five replicates each and fed a basal diet containing 0% (control), 0.25% (0.25 GEBE), 0.75% (0.75 GEBE), or 1.25% (1.25 GEBE) GEBE until 49 days of age. Chickens were then killed, and their meat, organs, and serum and cecal contents were collected. GEBE reduced the feed conversion ratio, particularly in the 0.75 and 1.25 GEBE groups. Furthermore, the GEBE diet improved meat tenderness and reduced the meat expressible moisture content and liver malondialdehyde content, indicating high meat quality. Whereas the 0.25 GEBE diet increased the level of <i>Lactobacillus acidophilus</i> in the cecum, the 0.75 GEBE diet decreased the <i>Escherichia coli</i> level therein. These findings demonstrate that GEBE may improve the meat quality and cecal microbiota of yellow-feathered chickens, providing a basis for identifying candidate alternatives to conventional antibiotics as growth promoting feed additives.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 ","pages":"2023023"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/cb/e2/jpsa-60-2023023.PMC10482210.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10218645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of Polymorphisms in the <i>HERC2</i>-<i>OCA2</i> Gene Locus and their Association with Feather Color in Quail.","authors":"Xiaohui Zhang,&nbsp;Yanxia Qi,&nbsp;Youzhi Pang,&nbsp;Bingjie Yuan,&nbsp;Xiaolong Li","doi":"10.2141/jpsa.2023013","DOIUrl":"https://doi.org/10.2141/jpsa.2023013","url":null,"abstract":"<p><p>Mutations in the <i>HERC2</i> and <i>OCA2</i> genes have the potential to affect pigment deposition and alter feather color in birds. Therefore, in this study, we evaluated <i>HERC2-OCA2</i> gene locus polymorphisms in Korean and Beijing white quails using RNA-Seq and KASP technology. The expression levels of <i>HERC2</i> and <i>OCA2</i> mRNA in skin tissues were analyzed using RT-qPCR. Ten single nucleotide polymorphisms were identified by RNA-Seq, of which three (n.117627564T>A, n.117674275T>G, n.117686226A>C) exhibited significant association with feather color in quail. The expression of <i>OCA2</i> mRNA was significantly lower in the skin of Beijing white quails than that in the skin of Korean quails. These results suggested that variants in <i>HERC2-OCA2</i> intergenic region could influence the expression of <i>OCA2</i>, which may underlie diluted feather color in the Beijing white quail.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023013"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/86/8e/jpsa-60-2023013.PMC10202620.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9532110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms underlying the Effects of Heat Stress on Intestinal Integrity, Inflammation, and Microbiota in Chickens.","authors":"Motoi Kikusato,&nbsp;Masaaki Toyomizu","doi":"10.2141/jpsa.2023021","DOIUrl":"https://doi.org/10.2141/jpsa.2023021","url":null,"abstract":"<p><p>Poultry meat and egg production benefits from a smaller carbon footprint, as well as feed and water consumption, per unit of product, than other protein sources. Therefore, maintaining a sustainable production of poultry meat is important to meet the increasing global demand for this staple. Heat stress experienced during the summer season or in tropical/subtropical areas negatively affects the productivity and health of chickens. Crucially, its impact is predicted to grow with the acceleration of global warming. Heat stress affects the physiology, metabolism, and immune response of chickens, causing electrolyte imbalance, oxidative stress, endocrine disorders, inflammation, and immunosuppression. These changes do not occur independently, pointing to a systemic mechanism. Recently, intestinal homeostasis has been identified as an important contributor to nutrient absorption and the progression of systemic inflammation. Its mechanism of action is thought to involve neuroendocrine signaling, antioxidant response, the presence of oxidants in the diet, and microbiota composition. The present review focuses on the effect of heat stress on intestinal dysfunction in chickens and the underlying causative factors. Understanding these mechanisms will direct the design of strategies to mitigate the negative effect of heat stress, while benefiting both animal health and sustainable poultry production.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023021"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f2/d4/jpsa-60-2023021.PMC10406517.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9976223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Bacterial 6-Phytase Improves Productive Performance, Precaecal Digestibility of Phosphorus, and Bone Mineralization in Laying Hens Fed a Corn-Soybean Meal Diet Low in Calcium and Available Phosphorus.","authors":"Maamer Jlali,&nbsp;Clémentine Hincelin,&nbsp;Maria Francesch,&nbsp;Tania Rougier,&nbsp;Pierre Cozannet,&nbsp;Sarper Ozbek,&nbsp;Marcio Ceccantini,&nbsp;Baris Yavuz,&nbsp;Aurélie Preynat,&nbsp;Estelle Devillard","doi":"10.2141/jpsa.2023019","DOIUrl":"https://doi.org/10.2141/jpsa.2023019","url":null,"abstract":"<p><p>Exogenous phytases are commonly added to low-phosphorus and low-calcium diets to improve P availability and reduce P excretion by poultry. This study investigated the effect of supplementation with a novel bacterial 6-phytase on egg production, egg quality, bone mineralization, and precaecal digestibility of P in laying hens fed corn-soybean meal-based diets. A total of 576 Hy-Line brown laying hens were used in a completely randomized block design at 25-45 weeks of age (woa). The three treatments included a positive control (PC) adequate-nutrient diet with 2840 kcal metabolizable energy/kg, 0.77% digestible lysine, 3.5% Ca, and 0.30% available P (avP); a negative control (NC) diet with 0.16% points less Ca and avP; and an NC diet supplemented with a novel bacterial 6-phytase at 300 phytase units/kg diet. Hen performance and the percentage of damaged eggs were measured every 4 weeks. Body weight, precaecal digestibility of P, and bone parameters at 45 woa were also measured. The reduction in avP and Ca in the NC diet did not compromise performance or egg quality. However, it decreased (P < 0.001) body weight, tibial dry matter, tibial ash and P content, and precaecal digestibility of P. Importantly, all these parameters were significantly improved (P < 0.001) and essentially restored to the levels measured in PC diet-fed hens upon supplementation with phytase. In summary, the present study demonstrates that the new bacterial 6-phytase could effectively counteract the negative effects of P and Ca deficiencies on body weight, bone mineralization, and P availability, thereby supporting high productivity without compromising the welfare of laying hens.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 ","pages":"2023019"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/dc/23/jpsa-60-2023019.PMC10397639.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9944353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of <i>Artemisia annua</i> L. Water Extract on Growth Performance and Intestinal Related Indicators in Broilers.","authors":"Shiwei Guo,&nbsp;Jiaxin Ma,&nbsp;Yuanyuan Xing,&nbsp;Yuanqing Xu,&nbsp;Xiao Jin,&nbsp;Sumei Yan,&nbsp;Lulu Shi,&nbsp;Linghui Zhang,&nbsp;Binlin Shi","doi":"10.2141/jpsa.2023024","DOIUrl":"https://doi.org/10.2141/jpsa.2023024","url":null,"abstract":"<p><p><i>Artemisia annua</i> L. is a natural herb with a variety of bioactive substances, which can play a variety of biological functions such as anti-inflammatory, antioxidant, antibacterial and antiviral, and can be used as a potential feed additive. The purpose of this study was to investigate the effects of different doses of <i>Artemisia annua</i> L. water extract (AAWE) on growth performance and intestinal related indicators in broilers. A total of 200 one-day-old Arbor Acre broilers were selected and randomly divided into five treatment groups, with five replicates in each group and eight birds per replicate. The control group was fed a basal diet, whereas the other groups were fed a basal diet supplemented with 0.5, 1.0, 1.5, or 2.0 g/kg AAWE. On d 21, with the increase in AAWE dose, final body weight and feed efficiency showed a quadratic increase effect, whereas feed intake showed a linear reduction effect; however, the apparent metabolic rate of dry matter, crude protein, and ether extract increased quadratically on d 42. In addition, the activity of duodenal chymotrypsin and trypsin, and of jejunal lipase quadratically increased, whereas the intestine crypt depth linearly decreased on d 42. The number of total anaerobic bacteria increased quadratically, whereas the number of <i>Escherichia coli</i> decreased quadratically. The number of <i>Lactobacillus</i> increased linearly, whereas H₂S emission linearly decreased on d 21; moreover, NH₃ emission (24 h) quadratically decreased on d 42. In conclusion, AAWE promoted the growth performance and intestinal related indicators of broilers.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 ","pages":"2023024"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/ca/70/jpsa-60-2023024.PMC10495255.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10263034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Chicken-Derived Genotype VII Newcastle Disease Virus Isolates from Northwest China.","authors":"Xinxin Qiu,&nbsp;Yanqing Jia,&nbsp;Zhencang Zhang,&nbsp;Xianglin Fo,&nbsp;Wenhui Wang","doi":"10.2141/jpsa.2023010","DOIUrl":"https://doi.org/10.2141/jpsa.2023010","url":null,"abstract":"ABSTRACT Newcastle disease virus (NDV) threatens global poultry production, with genotype VII the most prevalent strain in China. However, little information is available regarding viral multiplication and pathogenicity based inoculation route. The objectives of this study were to sequence NDV VII isolates and to analyze their biological characteristics in detail. A total of 86 oral and cloacal swabs were collected from Shaanxi and Gansu provinces in northwest China. Identification of genotype VII NDV based on the M gene was performed by qPCR. Viral multiplication and pathogenicity were assessed as a function of route of infection. We observed increased morbidity and mortality using intravenous injection, whereas intranasal, intraocular, and cloacal infections resulted in slower progression and milder clinical disease, with viral proliferation obvious in different tissues. These results provide an important basis for the clinical control and prevention of NDV epidemics in poultry.","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023010"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0b/8e/jpsa-60-2023010.PMC10132845.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9450494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Dietary Tryptophan on Growth Performance, Plasma Parameters, and Internal Organs of 1-28-Day-Old Sichuan White Geese.","authors":"Yang Fu,&nbsp;Bo Liu,&nbsp;Hui Lei,&nbsp;Zhenping Lin,&nbsp;JunPeng Chen,&nbsp;Yongwen Zhu,&nbsp;Hui Ye,&nbsp;Lin Yang,&nbsp;Wence Wang","doi":"10.2141/jpsa.2023008","DOIUrl":"https://doi.org/10.2141/jpsa.2023008","url":null,"abstract":"<p><p>Although the nutrient requirements of geese during the growing stage are known, the dietary requirement of amino acids during the starting period remains unclear. Optimum nutrient supplementation during the starting period is crucial for improved survival rates, body-weight gain, and marketing weight in geese. Our study focused on the effect of dietary tryptophan (Trp) supplementation on the growth performance, plasma parameters, and internal-organ relative weights in 1-28-day-old Sichuan white geese. A total of 1080 1-day-old geese were divided randomly into six Trp-supplemented (0.145%, 0.190%, 0.235%, 0.280%, 0.325%, and 0.370%) groups. Average daily feed intake (ADFI), average daily gain (ADG), and duodenal relative weight were highest in the 0.190% group, brisket protein level and jejunal relative weight in the 0.235% group, and plasma total protein and albumin levels in the 0.325% group (<i>P</i> < 0.05). Dietary Trp supplementation did not significantly affect the relative weights of the spleen, thymus, liver, bursa of Fabricius, kidneys, and pancreas. Moreover, the 0.145% - 0.235% groups showed significantly decreased liver fat (<i>P</i> < 0.05). Based on the non-linear regression analysis of ADG and ADFI, the dietary Trp levels between 0.183% and 0.190% were estimated to be optimal for 1-28-day-old Sichuan white geese. In conclusion, optimal dietary Trp supplementation in 1-28-day-old Sichuan white geese resulted in increased growth performance (0.180% - 0.190%) along with improved proximal intestinal development and brisket protein deposition (0.235%). Our findings provide basic evidence and guidance for optimal levels of Trp supplementation in geese.</p>","PeriodicalId":16883,"journal":{"name":"Journal of Poultry Science","volume":"60 2","pages":"2023008"},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a1/ed/jpsa-60-2023008.PMC10072300.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9253005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}