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Prevotella and succinate treatments altered gut microbiota,increased laying performance,and suppressed hepatic lipid accumulation in laying hens

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Journal of Animal Science and Biotechnology 2024年第2期15卷 844-861页

作者： Min Liu Zeyue Kang Xikang Cao hongchao jiao Xiaojuan Wang Jingpeng Zhao Hai Lin College of Animal Science and Technology Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and PreventionKey Laboratory of Efficient Utilization of Non‑Grain Feed Resources(Co‑Construction by Ministry and Province)Ministry of Agriculture and Rural AffairsShandong Agricultural UniversityTai’an 271018China

Background This work aimed to investigate the potential benefits of administering Prevotella and its primary metabolite succinate on performance,hepatic lipid accumulation and gut microbiota in laying *** One hundred and fifty 58-week-old Hyline Brown laying hens,with laying rate below 80%and plasma triglyceride(TG)exceeding 5 mmol/L,were used in this *** hens were randomly allocated into 5 groups and subjected to one of the following treatments:fed with a basal diet(negative control,NC),oral gavage of 3 mL/hen saline every other day(positive control,PC),gavage of 3 mL/hen Prevotella melaninogenica(10^(7)CFU/mL,PM)or 3 mL/hen Prevotella copri(10^(7)CFU/mL,***)every other day,and basal diet supplemented with 0.25%sodium succinate(Succinate).The results showed that PM and *** treatments significantly improved laying rate compared to the PC(P0.05).PM treatment increased(P<0.05)the mRNA levels of genes PGC-1βand APB-5B at week 4,and ACC and CPT-1 at week *** results indicated enhanced antioxidant activities at week 8,as evidenced by reduced hepatic malondialdehyde(MDA)level and improved antioxidant enzymes activities in PM and Succinate groups(P<0.05).Supplementing with Prevotella or succinate can alter the cecal ***,the abundance of Prevotella in the Succinate group was significantly higher than that in the other 4 groups at the family and genus levels(P<0.05).Conclusions Oral intake of Prevotella and dietary supplementation of succinate can ameliorate lipid metabolism of laying *** beneficial effect of Prevotella is consistent across different *** finding highlights that succinate,the primary metaboli

关键词： Fatty liver Gut microbiota Laying hen Prevotella Succinate

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基于超参数优化算法的随机森林模型预测奶牛呼吸频率

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农业工程学报 2024年第11期40卷 195-203页

作者：严格齐赵婉莹于镇伟焦洪超林海李浩施正香王朝元山东农业大学动物科技学院泰安271018 中国农村技术开发中心北京100045 山东农业大学机械与电子工程学院泰安271018 中国农业大学水利与土木工程学院北京100083 农业农村部设施农业工程重点实验室北京100083

奶牛呼吸频率是评估环境造成的奶牛热应激程度的重要指标之一。该研究基于随机森林(random forest,RF)算法提出了适用于生产条件下的奶牛个体呼吸频率准确预测模型,为了平衡模型精度与计算效率问题,利用遗传算法(genetic algorithm,GA)... 详细信息

奶牛呼吸频率是评估环境造成的奶牛热应激程度的重要指标之一。该研究基于随机森林(random forest,RF)算法提出了适用于生产条件下的奶牛个体呼吸频率准确预测模型,为了平衡模型精度与计算效率问题,利用遗传算法(genetic algorithm,GA)、差分进化(differential evolution,DE)算法、粒子群优化(particle swarm optimization,PSO)算法、贝叶斯优化(Bayesian optimization,BO)算法对模型超参数进行优化,并与网格搜索(grid search,GS)下的人工神经网络(artificial neural network,ANN)和极限梯度提升机(extreme gradient boosting,XGBoost)模型进行了对比分析。研究结果表明,使用融合环境参数的修正温湿指数(adjusted temperature-humidity index,ATHI)、时间区域、奶牛产奶量、泌乳天数、身体姿势以及胎次作为输入特征时,基准RF模型的预测性能最佳。在此基础上,4种智能优化算法下的RF模型性能优于GS-ANN和GS-XGBoost,其中BO-RF的综合性能最优,其决定系数、平均绝对误差、平均绝对百分比误差以及均方根误差分别为0.614次/min、7.723次/min、14.4%、9.737次/min,超参数优化耗时约为DE-RF的1/220。特征重要性分析表明,输入因子对奶牛呼吸频率的影响程度不同,ATHI是影响力最高的因子,相对重要性(relative importance,RI)为0.73,其次是时间区域(RI=0.09)和奶牛产奶量(RI=0.07)。研究为奶牛生产、健康评价及牛舍环境精准调控提供了有效方法和基础。

关键词：奶牛呼吸频率模型元启发式算法贝叶斯优化随机森林

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Dietary L-citrulline supplementation modulates nitric oxide synthesis and antioxidant status of laying hens during summer season

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Journal of Animal Science and Biotechnology 2021年第2期12卷 661-676页

作者： Victoria A.Uyanga hongchao jiao Jingpeng Zhao Xiaojuan Wang Hai Lin Department of Animal Science College of Animal Science and Veterinary MedicineShandong Provincial Key Laboratory of Animal Biotechnology and Disease ControlShandong Agricultural UniversityNo.61 Daizong StreetTai'an 271018ShandongChina

Background:L-citrulline(L-Cit),a non-protein amino acid,has been implicated in several physiological functions including anti-inflammatory,anti-oxidative,and hypothermic roles,however,there is a paucity of information with regards to its potential in poultry ***:This study was designed to investigate the effects of dietary L-Cit supplementation on the production performance,nitric oxide production,and antioxidant status of laying hens during summer ***-Line Brown laying hens(n=288,34 weeks old)were allotted to four treatment,6 replicates of 12 chickens *** treatments of control(basal diets),0.25%,0.50%and 1.00%L-Cit supplementation were fed to chickens for eight(8)*** performance,free amino acid profiles,nitric oxide production,and antioxidant properties were *** samples were collected at the 4th and 8th weeks of the ***:Air temperature monitoring indicated an average daily minimum and maximum temperatures of 25.02°C and 31.01°C *** supplementation with L-Cit did not influence(P>0.05)the production performance,and rectal temperature of laying *** shape index was increased(P<0.05)with increasing levels of ***-free content of arginine,citrulline,ornithine,tryptophan,histidine,GABA,and cystathionine were elevated,but taurine declined with L-Cit *** nitric oxide(NOx)concentration was highest at 1%***,nitric oxide synthase(NOS)activity for total NOS(tNOS)and inducible NOS(iNOS)were upregulated with increasing L-Cit levels,although,tNOS was not affected at the 4th ***-oxidant enzymes including catalase and superoxide dismutase(SOD)were increased with L-Cit supplementation,however,SOD activity was unchanged at 4th week,while total anti-oxidant capacity increased at the 8th week.L-Cit supplementation attenuated the extent of lipid peroxidation,and also inhibited glutathione peroxidase ***:Dietary L-Cit supplementation modulated systemi

关键词： Arginine Antioxidants Laying hens L-citrulline Nitric oxide Summer

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Effect of dexamethasone on hypothalamic expression of appetite-related genes in chickens under different diet and feeding conditions

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Journal of Animal Science and Biotechnology 2016年第4期7卷 554-560页

作者： Lei Liu Shaohua Xu Xiaojuan Wang hongchao jiao Jingpeng Zhao Hai Lin Department of Animal Science Shandong Agricultural UniversityShandong Key Lab for Animal Biotechnology and Disease Control

Background： Glucocorticoids （GCs） are involved in the control of appetite in birds and mammals. The effect of GCs on feed intake in birds depends on their dietary energy level. But the regulation mechanism of GCs on appetite is still unclear in chickens facing to different energy level. An experiment was conducted to investigate the effect of dexamethasone （DEX） on hypothalamic expression of appetite-related peptides in chickens fed high/low fat diet and under fasting/feeding condition. Results： An interaction between DEX injection and dietary energy level was found on hypothalamic corticotropin- releasing hormone （CRH） gene expression in fasted chickens （P 〈 0.05）. The chickens, given a DEX injection and a low fat diet treatment, had the highest CRH mRNA levels than any of the fasted chickens given treatments （P 〈 0.05）. Under fasting conditions, the DEX treatment significantly increased hypothalamic neuropeptide Y （NPY） and GC receptors mRNA levels （P 〈 0.05）. Under re-feeding conditions, DEX treatment significantly decreased hypothalamic expression levels of NPY and agouti-related peptide （AgRP） but significantly increased the level of hypothalamic CRH expression （P 〈 0.05）. Conclusion： A regulatory network formed by NPY, AgRP and CRH is associated with the appetite-control by GCs. The result suggests that the regulation of GCs on orexigenic neuropeptides expression is dependent at least partially on dietary energy level and feeding state.

关键词： Chickens Glucocorticoids Hypothalamus Neuropeptides

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L-Arginine/nitric oxide regulates skeletal muscle development via muscle fibre-specific nitric oxide/mTOR pathway in chickens

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Animal Nutrition 2022年第3期10卷 68-85页

作者： Ruxia Wang Kelin Li Li Sun hongchao jiao Yunlei Zhou Haifang Li Xiaojuan Wang Jingpeng Zhao Hai Lin Key Lab for Animal Biotechnology and Disease Control Department of Animal ScienceShandong Agricultural UniversityTai'an271000China Institute of Biological Resources Jiangxi Academy of SciencesNanchang330096China

L-Arginine (L-Arg), the precursor of nitric oxide (NO), plays an important role in muscle function. Fasttwitchglycolytic fibres are more susceptible to age-related atrophy than slow-twitch oxidative *** effect of L-Arg/NO on protein metabolism of fast- and slow-twitch muscle fibres was evaluated inchickens. In Exp. 1, 48 chicks at 1 day old were divided into 4 groups of 12 birds and subjected to 4treatments: basal diet without supplementation or supplemented with 1% L-Arg, and water supplementedwith or without L-nitro-arginine methyl ester (L-NAME, 18.5 mM). In Exp. 2, 48 chicks weredivided into 4 groups of 12 birds fed with the basal diet and subjected to the following treatments: tapwater (control), tap water supplemented with L-NAME (18.5 mM), or molsidomine (MS, 0.1 mM), or18.5 mM L-NAME t 0.1 mM MS (NAMS). The regulatory effect of L-Arg/NO was further investigatedin vitro with myoblasts obtained from chicken embryo pectoralis major (PM) and biceps femoris (BF).In vivo, dietary L-Arg supplementation increased breast (t14.94%, P < 0.05) and thigh muscle mass(t23.40%, P < 0.05);whereas, MS treatment had no detectable influence. However, L-NAME treatmentblocked the beneficial influence of L-Arg on muscle development. L-Arg decreased (P < 0.05) proteinsynthesis rate, phosphorylated mTOR and ribosomal protein S6 kinase beta-1 (p70S6K) levels in breastmuscle, which was recovered by L-NAME treatment. In vitro, L-Arg or sodium nitroprusside (SNP)reduced protein synthesis rate, suppressed phosphorylated mTOR/p70S6K and decreased atrogin-1 andmuscle RING finger 1 (MuRF1) in myoblasts from PM muscle (P < 0.05). L-NAME abolished the inhibitoryeffect of L-Arg on protein synthesis and the mTOR/p70S6K pathway. However, myoblasts from BF muscleshowed the weak influence. Moreover, blocking the mTOR/p70S6K pathway with rapamycin suppressedprotein synthesis of the 2 types of myoblasts;whereas, the protein expression of atrogin-1 and MuRF1levels were restricted only in myobl

关键词： Muscle fibre L-Arginine Nitric oxide/mTOR/p70S6K Atrogin-1 Muscle RING finger 1 Chicken

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Functional roles of taurine,L-theanine,Lcitrulline,and betaine during heat stress in poultry

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Journal of Animal Science and Biotechnology 2022年第4期13卷 967-986页

作者： Victoria Anthony Uyanga Emmanuel OOke Felix Kwame Amevor Jingpeng Zhao Xiaojuan Wang hongchao jiao Okanlawon MOnagbesan Hai Lin Department of Animal Science College of Animal Science and Veterinary MedicineShandong Provincial Key Laboratory of Animal Biotechnology and Disease ControlShandong Agricultural UniversityNo.61 Daizong StreetTai’an 271018Shandong ProvinceChina Department of Animal Physiology Federal University of AgricultureP.M.BAbeokutaOgun State 2240Nigeria Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengduSichuanChina.

Heat stress(HS)is an important environmental stress factor affecting poultry production on a global *** the rise in ambient temperature and increasing effects of global warming,it becomes pertinent to understand the effects of HS on poultry production and the strategies that can be adopted to mitigate its detrimental impacts on the performance,health,welfare,immunity,and survival of *** acids(AAs)have been increasingly adopted as nutritional modifiers in animals to ameliorate the adverse effects of *** are essential for protein synthesis,growth,maintenance,reproduction,immunity,stress response,and whole-body ***,HS tends to adversely affect the availability,transport,absorption,and utilization of these *** have investigated the provision of these AAs to poultry during HS conditions,and variable findings have been ***,L-theanine,and L-citrulline are non-essential amino acids that are increasingly gaining attention as nutritional supplements in HS ***,betaine is an amino acid derivative that possesses favorable biological properties which contributes to its role as a functional additive during *** particular note,taurine is negligible in plants,while betaine,L-theanine,and L-citrulline can be found in selected *** nutrients are barely found in feed ingredients,but their supply has been shown to elicit important physiological roles including anti-stress effects,anti-oxidative,anti-inflammatory,gut promoting,and immunomodulatory *** present review provides information on the use of these nutritionally and physiologically beneficial nutrients as functional additives to poultry diets during HS ***,although several studies have reported on the positive effects of these additives in human and murine studies,however,there is limited information regarding their utilization during heat stress in poultry ***,this review aims to expound on the functional pr

关键词： Amino acids Antioxidant Heat Stress Immunity Inflammation Nutrition Performance Poultry

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Effects of arginine replacement with L-citrulline on the arginine/nitric oxide metabolism in chickens:An animal model without urea cycle

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Journal of Animal Science and Biotechnology 2023年第3期14卷 1182-1200页

作者： Victoria Anthony Uyanga Lijing Sun Yu Liu Meiming Zhang Jingpeng Zhao Xiaojuan Wang hongchao jiao Okanlawon M.Onagbesan Hai Lin Department of Animal Science College of Animal Science and Veterinary MedicineShandong Provincial Key Laboratory of Animal Biotechnology and Disease ControlShandong Agricultural UniversityNo.61 Daizong StreetTai’an CityShandong Province 271018China Department of Animal Physiology Federal University of AgricultureOgun StateAbeokuta P.M.B 2240Nigeria

Background This study examined the efficacy of L-citrulline supplementation on the arginine/nitric oxide metabolism,and intestinal functions of broilers during arginine deficiency.A total of 288 day-old Arbor Acre broilers were randomly assigned to either an arginine deficient basal diet(NC diet),NC diet+0.50%L-arginine(PC diet),or NC diet+0.50%L-citrulline(NCL diet).Production performance was recorded,and at 21 days old,chickens were euthanized for tissue *** The dietary treatments did not affect the growth performance of broilers(P>0.05),although NC diet increased the plasma alanine aminotransferase,urate,and several amino acids,except arginine(P<0.05).In contrast,NCL diet elevated the arginine and ornithine concentration higher than NC diet,and it increased the plasma citrulline greater than the PC diet(P<0.05).The nitric oxide concentration in the kidney and liver tissues,along with the plasma and liver e NOS activities were promoted by NCL diet higher than PC diet(P<0.05).In the liver,the activities of arginase 1,ASS,and ASL,as well as,the gene expression of i NOS and OTC were induced by PC diet greater than NC diet(P<0.05).In the kidney,the arginase 1,ASS and ASL enzymes were also increased by PC diet significantly higher than the NC and NCL ***,the kidney had higher abundance of n NOS,ASS,ARG2,and OTC genes than the liver tissue(P<0.05).In addition,NCL diet upregulated(P<0.05)the m RNA expression of intestinal nutrient transporters(EAAT3 and PEPT1),tight junction proteins(Claudin 1 and Occludin),and intestinal mucosal defense(MUC2 and p Ig R).The intestinal morphology revealed that both PC and NCL diets improved(P<0.05)the ileal VH/CD ratio and the jejunal VH and VH/CD ratio compared to the NC fed *** This study revealed that NCL diet supported arginine metabolism,nitric oxide synthesis,and promoted the intestinal function of ***,L-citrulline may serve as a partial arginine replacement in broiler’s diet

关键词： Amino acids Arginine Broiler chicken Citrulline Intestinal health Nutrient transporters Tight junctions

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The optimal dietary arginine level of laying hens fed with low-protein diets

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Journal of Animal Science and Biotechnology 2022年第6期13卷 1887-1901页

作者： Mingfa Sun Ning Ma Hui Liu Yu Liu Yunlei Zhou Jingpeng Zhao Xiaojuan Wang Haifang Li Baishun Ma hongchao jiao Hai Lin Department of Animal Science Shandong Agricultural UniversityShandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention61 Daizong StreetTaian City 271018Shandong ProvinceChina College of Chemistry and Material Science Shandong Agricultural UniversityTaian City 271018Shandong ProvinceChina College of Life Sciences Shandong Agricultural UniversityTaian City 271018Shandong ProvinceChina Shandong He-Mei-Hua Agricultural Technology Co. LtdJinan City 250101Shandong ProvinceChina

Background:Arginine(Arg)is an essential amino acid(EAA)in poultry,an important substrate for protein synthesis and a precursor of several *** of EAAs with low protein(LP)diet increases the utilization efficiency of dietary crude protein(CP).However,if the EAA requirement is changed in hens fed a LP diet remains to be *** aim of the present study was to evaluate the optimal level of dietary Arg in the LP diet of hens.A total of 1350 Hy-Line Brown laying hens were randomly allocated to six dietary treatments:a basal diet(16%CP,positive control),or an isoenergetic LP diet(14%CP,0.80%Arg)supplemented 0,0.05%,0.10%,0.15%,and 0.20%L-Arg,corresponding to 0.80%,0.85%,0.90%,0.95%and 1.00%dietary Arg,***:The feed efficiency was decreased(P<0.05)by 0.80%and 1.00%Arg-LP diets,compared to *** LP diets,dietary Arg level had significant quadratic effects(P<0.05)on laying rate,egg mass,and feed *** to control,the plasma CAT activity or T-AOC content were decreased by 0.80%(P<0.001).However,the hens offered 0.85%and 0.90%Arg-LP diets had higher CAT activity(P<0.001)than 0.80%Arg-LP *** contrast,1.00%Arg-LP group had the highest MDA and the lowest T-AOC content in plasma,liver,duodenal and jejunal mucosa(P<0.05).Compared to control,the villus height was decreased by 0.80%,0.95%and 1.00%Arg-LP diets,while the villus height to crypt depth(V/C)ratio was reduced by 0.95%and 1.00%Arg-LP diets in ***:The result demonstrates that LP diet(14%CP)deficient in Arg(0.80%Arg)result in augmented oxidative damage and impaired development of intestinal *** to the quadratic broken-line regression model,the optimal dietary arginine levels for Hy-Line Brown laying hens fed with low protein diet(14%CP)aged 33 to 40 weeks are 0.85%,0.86%,and 0.86%to obtained the maximum laying rate,egg mass,and feed efficiency,respectively.

关键词： Anti-oxidation Arginine Laying performance Low protein diet

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Capacity sizing in the presence of repeated customer behavior:Dimensioning an inbound call center

Capacity sizing in the presence of repeated customer behavio...

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第30届中国控制与决策会议

作者： Miao Yu Mengting Zhang hongchao jiao School of Management Shenyang Jianzhu University

This research develops a behavioral queuing model with feedback for a call center in which managers determine capacity sizing to maximize profit. In this paper, we explicitly take into account repeated customer behavior,which implies that the satisfied customers might return and have an impact on the arrival rate. For this case, customer satisfaction as perceived in terms of waiting time changes according to the capacity *** this research defines the staffing optimality of the call center as the number of agents maximizing the profit, including the income from customers and the costs from *** a numerical analysis, this paper makes certain comparisons with the traditional models that do not consider repeated customer behavior. Furthermore, the results indicate how managers allocate the optimal staffing with various customer behavior mechanisms.

关键词： Behavioral queuing Staffing Repeated behavior Call center and Satisfaction

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低蛋白质饲粮对家禽肠道健康的影响研究进展

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动物营养学报 2022年第10期34卷 6213-6219页

作者：焦洪超刘慧林海山东农业大学动物科技学院山东省动物生物工程与疾病防治重点实验室泰安271018

通过在低蛋白质饲粮中补充合成氨基酸,是解决当前养殖生产中蛋白质饲料资源短缺和降低饲料成本的有效途径之一。健全的肠道功能在维持机体健康和生产性能方面发挥至关重要的作用。动物肠道需要一定水平的营养物质来维持肠黏膜的生长以... 详细信息

通过在低蛋白质饲粮中补充合成氨基酸,是解决当前养殖生产中蛋白质饲料资源短缺和降低饲料成本的有效途径之一。健全的肠道功能在维持机体健康和生产性能方面发挥至关重要的作用。动物肠道需要一定水平的营养物质来维持肠黏膜的生长以及发挥肠道功能,饲粮蛋白质水平对于肠道结构、消化吸收及免疫功能等具有显著影响。本文综述了低蛋白质饲粮对家禽肠道健康、肠道形态及屏障结构影响的研究进展,旨在为低蛋白质饲粮及相关技术在肠道功能研究和家禽生产上进一步推广应用提供参考。

关键词：低蛋白质饲粮家禽肠道屏障肠道健康

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