检索结果-南通市图书馆

Impact of sugar beet pulp and wheat bran on serum biochemical profile,inflammatory responses and gut microbiota in sows during late gestation and lactation

引用

Journal of Animal Science and Biotechnology 2021年第4期12卷 1370-1383页

作者： Qinghui Shang sujie liu Hansuo liu Shad Mahfuz Xiangshu Piao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityNo.2 Yuanmingyuan West RoadBeijing 100193China

Background:Sows are frequently subjected to various stresses during late gestation and lactation,which trigger inflammatory response and metabolic *** fiber can influence animal health by modulating gut microbiota and their by-products,with the effects depending upon the source of the dietary *** study aimed to evaluate the impacts of different fiber sources on body condition,serum biochemical parameters,inflammatory responses and fecal microbiota in sows from late gestation to ***:Forty-five multiparous sows(Yorkshire×Landrace;3–6 parity)were assigned to 1 of 3 dietary treatments from d 85 of gestation to the end of lactation(d 21 post-farrowing):a control diet(CON,a corn-soybean meal diet),a sugar beet pulp diet(SBP,20%SBP during gestation and 10%SBP during lactation),and a wheat bran diet(WB,30%WB during gestation and 15%WB during lactation).Results:Compared with CON,supplementation of SBP decreased(P<0.05)lactation BW loss,reduced(P<0.05)serum concentration of total cholesterol,non-esterified fatty acids,interleukin-6 and tumor necrosis factor-α,and increased(P<0.05)fecal water content on d 110 of gestation and d 21 of lactation,while supplementation of WB reduced(P<0.05)serum concentration of total cholesterol on d 110 of gestation,increased(P<0.05)fecal water content and decreased(P<0.05)serum interleukin-6 concentration on d 110 of gestation and d 21 of *** addition,sows fed SBP had lower(P<0.01)abundance of Clostridium_sensu_stricto_1 and Terrisporobacter than those fed CON,but had greater(P<0.05)abundance of Christensenellaceae_R-7_group and Ruminococcaceae_UCG-002 than those fed the other two diets on d 110 of *** d 21 of lactation,supplementation of SBP decreased(P<0.05)the abundance of Firmicutes and Lactobacillus,but enriched(P<0.05)the abundance of Christensenellaceae_R-7_group,Prevotellaceae_NK3B31_group,Ruminococcaceae_UCG-002,Prevotellaceae_UCG_001 and unclassified_f__Lachnospiraceae compared with

关键词： Dietary fiber source Gut microbiota Inflammatory response Serum biochemical profile Sow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Natural capsicum extract replacing chlortetracycline enhances performance via improving digestive enzyme activities,antioxidant capacity,anti-inflammatory function,and gut health in weaned pigs

引用

Animal Nutrition 2021年第2期7卷 305-314页

作者： Shenfei Long sujie liu Jian Wang Shad Mahfuz Xiangshu Piao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China

The objective of this study was to investigate the effects of natural capsicum extract(NCE,containing 2%natural capsaicin,the rest is carrier)replacing chlortetracycline(CTC)on performance,digestive enzyme activities,antioxidant capacity,inflammatory cytokines,and gut health in weaned pigs.A total of 108 weaned pigs(Duroc×[Landrace×Yorkshire],initial body weight-8.68±1.34 kg;weaned on d 28)were randomly allotted into 3 treatments with 6 replicate pens per treatment(3 barrows and 3 gilts per pen).The treatments include a corn-soybean meal basal diet as a control group(CON),a CTC group(basal diet+CTC at 75 mg/kg),and a NCE group(basal diet--NEC at 80 mg/kg).Compared with CON and CTC,NCE had increased(P<0.05)average daily gain in phase 2(d 15 to 28)and overall(d 1 to 28),and higher(P<0.05)apparent total tract digestibility of gross energy,dry matter,crude protein,and organic matter in phase 1(d 1 to 14).These pigs also had increased(P<0.05)pancrelipase activity in pancreas,α-amylase,lipase and protease activities in the jejunal mucosa,and lipase activity in the ileal mucosa on d ***,NCE had increased(P<0.05)the contents of growth hormone,β-endorphin,5-hydroxytryptamine,total antioxidant capacity,total superoxide dismutase,catalase,and IL-10,as well as decreased(P<0.05)contents of malondialdehyde,tumor nuclear factor-a,interferon-y,and interleukin-6 in serum on d 28 compared with CON and *** showed higher(P<0.05)propionic acid,butyric acid and total volatile fatty acids(VFA)contents,and increased(P<0.05)relative abundance of Faecalibacterium in colon,as well as higher(P<0.05)propionic acid and total volatile fatty acids in cecum on d 28 compared with *** conclusion,NCE replacing CTC could enhance performance via improving digestive enzyme activities,antioxidant capacity,anti-inflammatory function,gut VFA composition and microbiota community in weaned pigs,and it could be used as a potential target for the development of feed additives.

关键词： Antioxidant capacity Chlortetracycline Natural capsicum extract Performance Weaned pig

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mixed organic acids as an alternative to antibiotics improve serum biochemical parameters and intestinal health of weaned piglets

引用

Animal Nutrition 2021年第3期7卷 737-749页

作者： Jiayu Ma Xiangshu Piao Qinghui Shang Shenfei Long sujie liu Shad Mahfuz State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

The primary aim of this experiment was to critically explore the relationship between the different levels of mixed organic acids(MOA)and growth performance,serum antioxidant status and intestinal health of weaned piglets,as well as to investigate the potential possibility of MOA alternative to antibiotics growth promoters(AGP).A total of 180 healthy piglets(Duroc×[Landrace×Yorkshire];weighing 7.81±1.51 kg each,weaned at d 28)were randomly divided into 5 treatments:1)basal diet(CON);2)CON+chlorinomycin(75 mg/kg)+virginiamycin(15 mg/kg)+guitaromycin(50 mg/kg)(AGP);3)CON+MOA(3,000 mg/kg)(OA1);4)CON+MOA(5,000 mg/kg)(OA2);5)CON+MOA(7,000 mg/kg)(OA3).This study design included 6 replicates per treatment with 6 piglets per pen(barrow:gilt=1:1)and the experiment was separated into phase 1(d 1 to 14)and phase 2(d 15 to 28).In phases 1,2 and overall,compared with the CON,the feed conversion ratio(FCR)was reduced(P<0.01)and the average daily gain(ADG)was increased(P<0.05)in piglets supplemented with AGP,OA1 and *** con-centration of serum immunoglobulins G(IgG)was improved(P<0.05)in piglets supplemented with OA2 in phase *** the jejunum and ileum,the villus height:crypt depth ratio was significantly increased(P<0.01)in piglets fed AGP and *** mRNA expression level of claudin-1 and zonula occludens-1(ZO-1)(P<0.01)was up-regulated in piglets supplemented with OA1 and *** piglets fed AGP,OA1 and OA2 showed an increase(P<0.05)in the content of acetate acid and total volatile fatty acids(TVFA)in the cecum,and butyric acid and TVFA in the colon compared with ***,OA1 lowered(P<0.05)the content of Lachnospiraceae in *** results demonstrated that MOA at 3,000 or 5,000 mg/kg could be an alternative to antibiotics due to the positive effects on performance,immune parameters,and intestinal health of weaned ***,from the results of the quadratic fitting curve,it is inferred that MOA at a dose of 4,000 mg/kg may produce a better effect.

关键词： Weaned piglet Organic acid Growth performance Intestinal health

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Growth performance,serum parameters,inflammatory responses,intestinal morphology and microbiota of weaned piglets fed 18%crude protein diets with different ratios of standardized ileal digestible isoleucine to lysine

引用

Animal Nutrition 2024年第1期16卷 313-325页

作者： Jian Wang sujie liu Jiayu Ma Xiaoli Dong Shenfei Long Xiangshu Piao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China Beijing Jingwa Agricultural Science and Technology Innovation Center Beijing101206China CJ International Trading Co. LtdShanghai 201107China

The present study was to explore the Ile requirement of piglets fed 18%crude protein(CP)*** hundred and fifty 28-day-old Duroc×Landrace×Yorkshire piglets(8.37±1.92 kg)were randomly divided into 5 dietary treatments(10 piglets per replicate,5 barrows and 5 gilts per replicate)with 45%,50%,55%,60%,65%standardized ileal digestible(SID)Ile-to-Lys ratios,and the SID Lys was formulated to1.19%.The experimental design consisted of two phases(d 1 to 14 and d 15 to 28).Results showed that average daily gain(ADG)had a tendency to quadratically increase as the SID Ile-to-Lys ratio increased(P=0.09),and the optimum SID Ile-to-Lys ratios required to maximize ADG were 48.33%and 54.63%for broken-line linear model and quadratic polynomial model,*** SID Ile-to-Lys ratios had no significant effects on average daily feed intake and gain-to-feed *** matter(P<0.01),CP(P=0.01),ether extract(P=0.04),gross energy(P<0.01)and organic matter(P<0.01)digestibility increased *** total cholesterol levels decreased linearly(P=0.01)and quadratically(P<0.01);aspartate aminotransferase(P<0.01),interleukin-1β(P=0.01),and tumor necrosis factor-a(P<0.01)levels decreased quadratically;immunoglobulin G(P=0.03)and immunoglobulin M(P=0.01)concentrations increased *** Ser levels decreased linearly(P<0.01)and quadratically(P=0.01);Glu(P=0.02),Arg(P=0.05),and Thr(P=0.03)levels decreased quadratically;Gly(P<0.01)and Leu(P=0.01)levels decreased linearly;Ile(P<0.01)concentration increased *** villus height(P<0.01)and villus height to crypt depth ratio(P<0.01)increased *** deficiency or excess of Ile decreased short chain fatty acid-producing bacteria abundance and increased pathogenic bacteria ***,taking ADG as the effect index,the optimum SID Ile-to-Lys ratios of piglets offered 18%CP diets were 48.33%and 54.63%based on two different statistical models,respectively,and the deficiency or excess of lle negative

关键词： Weaned piglet Growth performance Intestinal health Isoleucine Reduced crude protein diet

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A simplified model for unsteady airflow analysis in ultra-long tunnels based on the resistance compensation method

引用

Building Simulation 2024年第10期17卷 1823-1840页

作者： Xianwang Fan Huan Zhang Zhihao Wan Zhikai liu Jiali liu Junbin Yang sujie liu Jiaxuan Pu Zhaoying Wang Yan Jiang Zhangxiang Wu Shijun You Wandong Zheng School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China CSCEC Southwest Consulting Co. LtdChengdu 610041SichuanChina School of Architecture Tsinghua UniversityBeijing 100084China

With the expansion of tunnel construction scale,accurate modeling of 3D unsteady flow fields in ultra-long tunnels requires high computational *** this study,a resistance compensation method based on the St and Eu similarity criterion is proposed to construct the simplified model to rapidly and precisely replicate the train-driven unstable airflow.A 6000 m ultra-long tunnel is utilized as a reference model and simplified models with the scale ratio varying from 80%to 10%are developed to assess the method *** multi-region dynamic mesh model is employed to simulate train tracking *** weighing the computational accuracy and efficiency,the results show that 20%is the optimal scale *** unsteady wind speed of the simplified model deviates 6.96%from the reference model,while the simulation computation time is reduced by 85.01%.On this basis,the simplified model is applied to analyze the impacts of tunnel friction coefficients,blockage rates,train lengths and speeds,and departure *** mean bias error(MBE)and Pearson correlation coefficient(PCC)are within 10%and over 0.8 respectively,confirming the reliability of the simplified *** resistance compensation method is a crucial technique to improve the accuracy and efficiency of the unsteady flow field in ultra-long tunnels.

关键词： resistance compensation dynamic mesh ultra-long tunnel simplified model unsteady airflow

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The relationships between urban-rural temperature difference and vegetation in eight cities of the Great Plains

引用

Frontiers of Earth Science 2019年第2期13卷 290-302页

作者： Yaoping CUI Xiangming XIAO Russell B DOUGHTY Yaochen QIN sujie liu Nan LI Guosong ZHAO Jinwei DONG Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions Henan UniversityKaifeng 475004China Department of Microbiology and Plant Biology Center for Spatial AnalysisUniversity of OklahomaNormanOK 73019USA Ministry of Education Key Laboratory of Biodiversity Science and Ecological Engineering Institute of Biodiversity ScienceFudan UniversityShanghai 200438China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Interpreting the relationship between urban heat island (UHI) and urban vegetation is a basis for understanding the impacts of underlying surfaces on UHL The calculation of UHI intensity (UHII) requires observations from paired stations in both urban and rural *** to the limited number of paired meteorological stations,many studies have used remotely sensed land surface temperature,but these time-series land surface temperature data are often heavily affected by cloud cover and other *** factors,together with the algorithm for inversion of land surface temperature,lead to accuracy problems in detecting the UHII,especially in cities with weak *** on meteorological observations from the Oklahoma Mesonet,a world-class network,we quantified the UHII and trends in eight cities of the Great Plains,USA,where data from at least one pair of urban and rural meteorological stations were *** examined the changes and variability in urban temperature,UHII,vegetation condition (as measured by enhanced vegetation index,EVI),and evapotranspiration (ET).We found that both UHI and urban cold islands (UCI) occurred among the eight cities during 2000-2014 (as measured by impervious surface area).Unlike what is generally considered,UHII in only three cities significantly decreased as EVI and ET increased (p < 0.1),indicating that the UHI or UCI cannot be completely explained simply from the perspective of the underlying *** vegetative cover (signaled by EVI) can increase ET,and thereby effectively mitigate the *** study station clearly showed that the underlying surface or vegetation affects urban-rural temperature,and that these factors should be considered during analysis of the UHI effect over time.

关键词： urbanization evapotranspiration urban cold island background climate air temperature

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Endogenous chitinase might lead to differences in growth performance and intestinal health of piglets fed different levels of black soldier fly larva meal

引用

Animal Nutrition 2023年第3期14卷 411-424页

作者： sujie liu Jian Wang Longxian Li Yonggai Duan Xiaolin Zhang Tenghao Wang Jianjun Zang Xiangshu Piao Yongxi Ma Defa Li State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityNo.2 Yuanmingyuan West RoadBeijing100193China Bennong Agricultural Technology Co. Ltd.Zhengzhou450045China Zhejiang Qinglian Food Co. LtdJiaxing314399China

This study aimed to investigate the effects of different levels of black soldier fly(BSF)replacing soybean meal(SBM)in diets on the performance and health condition of piglets.A total of 180 weaned piglets were allocated into 5 treatments:BSF0(corn-soybean meal basal diet),BSF25(BSF replacing 25%SBM),BSF50(BSF replacing 50%SBM),BSF75(BSF replacing 75%SBM)and BSF100(BSF replacing 100%SBM).During the whole period,in comparison with BSF0,average daily gain(ADG)and average daily feed intake increased in the BSF25 and BSF50 groups,whereas ADG decreased in the BSF75 and BSF100groups(P<0.05).The result of quadratic fitting curve showed that piglets exhibited the highest ADG when BSF replaced around 20%*** with BSF0,organic matter and dry matter digestibility improved in the BSF25 group,whereas ether extract digestibility decreased in the BSF100 group(P<0.05).In comparison with BSF0,piglets from the BSF25 group showed a higher duodenal ratio of villus height to crypt depth,increased jejunal sucrase activity,serum neuropeptide Y and ghrelin levels,elevated ileal immunoglobulin(Ig)A,Ig G and Ig M contents and a lower leptin level,and piglets from the BSF100 group exhibited an increased relative weight of kidney(P<0.05).However,no significant differences were observed in the expression level of tight junction proteins and chitin-degrading ***,compared with BSF0,the abundance of short chain fatty acid producing bacteria such as Ruminococcaceae,Faecalibacterium and Butyricicoccus increased,and potential pathogenic bacteria decreased in piglets from the BSF25 group,whereas piglets from the BSF100 group had a greater abundance of harmful *** conclusion,BSF replacing 25%SBM in diets could improve digestive parameters,immune function and intestinal microbiota,and thus improved growth performance of ***,BSF replacing 100%SBM showed an adverse effect on piglet performance,and the reason might be related to the limited amount of chitin-degra

关键词： Black soldier fly Supplementation level Endogenous chitinase Gut microbiota Weaned pigs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adaptive Backstepping Sliding Mode Controller Design Based on "H" Type Quadrotor

Adaptive Backstepping Sliding Mode Controller Design Based o...

引用

第36届中国控制会议

作者： Linqi Zhang Jianan Wu sujie liu Changqing Wang Aijun Li School of Automation Northwestern Polytechnical University

A 6DOF mathematical model of the "H" type quadrotor prototype is developed by the Newton-Euler method to analyze the complex nonlinear position and attitude control problems in this *** the PID controllers are designed for the control of the horizontal position of the *** adaptive backstepping sliding mode controllers are designed for the altitude and attitude control of the quadrotor and the stability is proved based on Lyapunov ***,simulation is carried out under the MATLAB/*** simulation results show that the controllers we designed can effectively realize the control of the quadrotor model,and the method has good tracking and anti-interference ability.

关键词： quadrotor adaptive control backstepping sliding mode control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于IGG权重函数复数域多元线性回归算法的谐波责任分摊方法

引用

电力自动化设备 2017年第3期37卷 160-166页

作者：刘苏婕肖先勇刘亚梅陈飞宇四川大学电气信息学院四川成都610065

针对现有多谐波源责任分摊方法中存在的测量平差问题,对谐波责任稳健估计方法进行了研究。为了克服系统背景谐波电压波动的影响,提出基于复残差的背景谐波电压划分方法,引入中国科学院大地测量与地球物理研究所提出的IGG权重函数,基于... 详细信息

针对现有多谐波源责任分摊方法中存在的测量平差问题,对谐波责任稳健估计方法进行了研究。为了克服系统背景谐波电压波动的影响,提出基于复残差的背景谐波电压划分方法,引入中国科学院大地测量与地球物理研究所提出的IGG权重函数,基于复数域多元线性回归数学模型,在各时段内重复使用IGG权重函数确定回归系数,以提高背景谐波电压中样本筛选的抗差性;结合等效谐波阻抗的置信区间,提出了评估结果的检验方法;对IEEE 14节点测试系统进行仿真,仿真结果表明所提多谐波源责任分摊方法能够有效克服系统背景谐波电压波动的影响,并与现有分摊方法进行比较,验证所提方法的准确性和可行性。

关键词：多谐波源责任分摊复数域多元线性回归 IGG权重函数置信区间谐波分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

具有电压自动调整功能的供电型电压互感器误差来源分析及补偿

引用

高电压技术 2020年第7期46卷 2554-2560页

作者：李璿丁嘉靖刘西超吴士普黄华刘苏婕中国电力科学研究院有限公司武汉430074 电网环境保护国家重点实验室武汉430074 国网四川省电力公司电力科学研究院成都610041

为解决供电型电压互感器供电电压随供电负荷波动而变化的问题,设置了辅助互感器串联补偿回路,该回路能够实现对供电电压的自动调节,但会影响电压测量绕组的误差。同时对具有辅助互感器串联补偿回路的供电型电压互感器的误差来源进行了分... 详细信息

为解决供电型电压互感器供电电压随供电负荷波动而变化的问题,设置了辅助互感器串联补偿回路,该回路能够实现对供电电压的自动调节,但会影响电压测量绕组的误差。同时对具有辅助互感器串联补偿回路的供电型电压互感器的误差来源进行了分析,分析结果表明,增加辅助互感器串联补偿回路后,电压测量绕组误差由空载误差、负载误差和辅助回路误差3部分组成。在此基础上对1台容量60 kVA的110 kV供电型电压互感器样机误差进行测量,在负载误差补偿完成后,由于辅助回路分接比变化引起的比值差和相位差的最大变化量达到0.462%和73.14′。通过计算获得了辅助补偿阻抗的数值,并最终实现不同分接比,不同供电负荷容量及功率因数下的误差补偿,补偿后电压测量绕组的误差达到0.2级误差限值要求。该研究实现了对具有电压自动调整功能的供电型电压互感器误差的补偿,使得供电型电压互感器在波动负荷下,同时实现稳定的电压输出和电压计量。

关键词：供电型电压互感器电压自动调整辅助互感器误差补偿误差来源

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：