检索结果-南通市图书馆

Environmental and landscape influences on the spatial and temporal distribution of a cattle herd in a South Texas rangeland

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

Ecological Processes 2020年第1期9卷 443-460页

作者： Christopher Cheleuitte-Nieves Humberto L.Perotto-Baldivieso XBen Wu Susan M.Cooper department of Ecosystem Science and Management Texas A&M University2120 TAMU320 WFES BuildingCollege StationTX 77843-2138USA Present address:Center of Comparative Medicine and Pathology Memorial Sloan Kettering Cancer CenterWeill Cornell Medicineand Hospital for Special Surgery408 East 69th StreetZ-913New YorkNY 10021USA Caesar Kleberg Wildlife Research Institute Texas A&M University-Kingsville700 University Blvd.MSC 218KingsvilleTX 78363USA Texas A&M AgriLife Research 1619 Garner Field RoadUvaldeTX 78801USA

The multiple spatial and temporal parameters affecting cattle herd distribution and activity dynamics can significantly affect resource utilization but are not fully *** aim of this study was to determine whether current animal tracking technology and spatio-temporal analysis tools can be used to integrate multi-scale information on herd distribution patterns as a function of seasonal forage production,periods of the day,animal activity,and landscape *** and activity information of 11 free-ranging cows within a 31-member herd was obtained at 5-min intervals by using GPS collars for 1 year within a 457-ha ranch in the semi-arid rangelands of South *** biomass was calculated with satellite *** analysis of cattle distribution and landscape features was conducted with *** spread was greatest during the growing *** the year,during midday,the herd showed smaller spread and greater use of shade patches than any other time of *** also aggregated under trees in winter,particularly during the *** was no statistically significant overall pattern of seasonal changes in the use of water and supplemental feeding areas,but a trend toward highest use during the ***,significantly different diurnal patterns in the use of supplemental feed and water were observed within each *** study found a strong influence of shade patches relative to the influence of water and supplemental feeding areas on the diurnal and seasonal movement patterns of cattle in shrub-dominated *** this study used only 11 tracked cows in a 31-member herd,the results indicated that techniques such as seasonal and diurnal GPS tracking,GIS,and remote sensing data enable evaluation of multiple spatial and temporal dynamics of cattle distribution and activity *** smaller spread during the dry winter season associated with the observed aggregation of individuals in water and supplemental feeding ar

关键词： Cattle behavior Cross-scale interactions GPS collars Group dispersion Normalized difference vegetation index(NDVI) Thermoregulation Ungulate grazing patterns

Development of Cold-Chain for Postharvest Loss Reduction of Chinese Cabbage(Brassica campestris ***)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Food Science and Engineering 2021年第1期11卷 9-22页

作者： Rathana Nai Buntong Borarin Tong Socheath Jessie LVipham Glenn MYoung Karen LeGrand Faculty of Agro-Industry Royal University of AgriculturePhnom Penh 12000-12401Cambodia Division of Research and Extension Royal University of AgriculturePhnom Penh 12000-12401Cambodia Mid-Campus Drive North Kansas State UniversityWeber HallManhattanKS 66506-8028United States department of Food Science and technology College of Agricultural and Environmental ScienceUniversity of California-Davis595 Hilgard LaneDavisCA 95616United States Science and Mathematics Division Department of BiologySierra College5100 Sierra College BoulevardRocklinCA 95677United States

Cold-chain is a well-known method for reducing postharvest losses and low-cost cooling technology has not previously been tested as part of postharvest handling in *** objective of this study was to measure postharvest loss,quality changes,and safety concerns of Chinese cabbage(Brassica campestris ***),during transportation using a cold-chain and compared to current farmers’employing ambient-chain *** quality and safety of Chinese cabbage were further evaluated by using ambient storage and Coolbot-powered cold chamber storage with and without modified atmosphere packaging(MAP).The samples were transported from farm sources in Battambang Province to a Phnom Penh specialty wholesale *** loss was evaluated by measuring weight loss and visual quality measurements,in addition to various physiochemical and nutritional quality *** addition,food safety was evaluated by quantifying total coliforms and Enterobacteriaceae,as well as the Salmonella spcies,and Escherichia *** results revealed that the cold-chain avoided postharvest loss,as indicated by produce weight gain of 14%on market arrival due to rehydration while inside the ice box during *** contrast,the traditional practice of ambient transport(28-31°C,62-78%relative humidity)resulted in very high postharvest loss,comprising 11%weight loss and 10%visual quality loss,for a total loss of 21%.Moreover,leaf yellowing found no marked influence on shelf life as L*,a*and b*values did not greatly differ with *** total soluble solids(TSS),titratable acidity(TA),pH and vitamin C content were not significantly affected during *** safety indicators(coliforms,Enterobacteriaceae,Salmonella and Escherichia coli)were lower in cold-chain storage than ambient-chain with lower counts of coliform bacteria,Enterobacteriaceae,and Salmonella *** traditionally handled *** coli was detected only in cold-chain *** had no effec

关键词： Chinese cabbage postharvest practices postharvest loss Coolbot storage ice box packaging MAP food safety

Effects of Moringa oleifera and Morinda citrifolia Extracts on Performance of Multiparous Sows and Suckling Piglets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

animal Husbandry and feed Science 2020年第1期12卷 36-40页

作者： Li Yuanfeng He Jian Ao Xiang College of Life Science and Engineering Southwest University of Science and TechnologyMianyang 621000China Feng Guangde Laboratory of Sichuan Tie Qi Li Shi Group Mianyang 621000China

[Objective]The test was to investigate the effects of MM(Moringa oleifera and Morinda citrifolia)extracts on reproductive performance of multiparous sows and growth performance of suckling piglets.[Method]A total of 60 multiparous sows(Landrace×Large White,2-4 parities)were randomly assigned into two treatments,30 replicates per treatment and one sow per *** in control group were fed with basal diet,and those in experimental groups were fed with the basal diet supplemented with 500 mg/kg MM *** trial lasted 28 d(from 7 d before delivery to 21 d post lactation).[Result]MM extract had no significant effect on sow’s stage of labor and estrus rate at 7 d post weaning(P>0.05).MM extract had no significant impact on growth performance of suckling piglets(P>0.05).[Conclusion]Addition of MM extracts in the diet of multiparous sows at 7 d before delivery did not improve the performance of sows and piglets,but shortened sow’s stage of labor and promoted estrus of sows after weaning to a certain extent.

关键词： Moringa oleifera and Morinda citrifolia extract Multiparous sow Piglet Production

In Vitro Probiotic Effect of Pseudostellaria heterophylla Fibrous Roots on feed Bacillus subtilis and Preliminary Study on Its Solid Fermentation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

animal Husbandry and feed Science 2019年第2期11卷 72-76页

作者： Pan Huiqing Zhang Yanda Li Zhujin Zhao Qi Fujian Beidi Pharmaceutical Co. Ltd. Ningde 355300 China Municipal Enterprise technology Center of Fujian Beidi Pharmaceutical Co. Ltd. Ningde 355300 China

Traditional Chinese medicine Pseudostellaria heterophylla fibrous roots have been widely studied and applied in non-antibiotic clinical breeding of livestock and poultry. In vitro probiotic effect of P. heterophylla fibrous roots extract on feed probiotics Bacillus subtilis BD-K010 was studied, and the feasibility of solid fermentation of P. heterophylla fibrous roots was preliminarily evaluated. For in vitro probiotic effect, the increased concentration of P. heterophylla fibrous roots extract dependently increased the total biomass of B. subtilis BD-K010;1.0% P. heterophylla fibrous roots extract received the best effect, and the final p H of 1.0% experimental group was closer to neutral. Meantime, B. subtilis BD-K010 with optimum concentration of P. heterophylla fibrous roots showed significantly higher in vitro antibacterial effect than the control group(Panimal husbandry.

关键词： Pseudostellaria heterophylla fibrous roots feed probiotics Bacillus subtilis In vitro probiotic effect Solid fermentation

Lactobacillus rhamnosus GR-1 attenuates Escherichia coli- induced inflammation and cell damage in primary bovine mammary epithelial cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

畜牧与饲料科学 2015年第Z1期 343-343页

作者： WU Qiong ZHANG Wei LIU Mingchao ZHU Yaohong department of Veterinary Clinical Sciences College of Veterinary MedicineChina Agricultural University

Bovine mammary epithelial cells(BMECs) were successfully cultivated using tissue mass inoculation method in this study,and fibroblast cells was removed by adding nutrition factors and controlling the time of *** isolated BMECs were thoroughly morphological and structural characteristic via immunocytochemistry,morphology,scanning electron microscopy(SEM) and transmission electron microscope(TEM).Our results showed that the obtained BMECs morphology together with the positive staining for Cytokeratin 18 was a powerful result to prove the specific epithelium characters of *** obtained BMECs were present as acobblestone form and proliferating *** cells had normal morphology,growth characteristics and mitochondrial and endoplasmic reticulum in cell cytoplasms,BMECs could be passaged 15 generations with a good behavior of proliferation,thus,it might represent an useful tool for studying the function of bovine mammary *** coli(***) is the major pathogens causing mammary infection of dairy *** are extensively used to promote gastrointestinal health,and emerging evidence suggests that their beneficial properties can extend beyond the local environment of the ***,we determined whether pre-incubated with probiotics can protect against ***-induced *** medium alone,the BMECs were plump and with plenty of microvilli,whereas *** infection caused microvilli missing,cellular atrophy and different degrees of cell *** cells infected with *** alone,*** adhered on the surface of BMECs and the *** internalization in nucleus was *** BMECs incubated with only *** GR-1 maintained the intact ultrastructure and were with microvilli and plump ***,pretreatment with *** GR-1 prevented disruption of the ultrastructure of BMECs for up to 6 h following *** *** medium alone,the BMECs exhibited normal appearance(the cells with intact cytoplasm and organelle

关键词： Lactobacillus rhamnosus Escherichia coli bovine mammary epithelial cell

Modelling Manure Production in Beef Calves: Development, Evaluation, and Application of a Complete vs. Simplified Prediction Model

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Agricultural Science and technology(A) 2022年第2期12卷 84-95页

作者： Davide Biagini Carla Lazzaroni department of Agricultural Forest and Food Science University of TorinoLargo Paolo Braccini 2Grugliasco 10095Italy

There has been increased interest in quantifying the manure production of livestock, primarily driven by public authorities, who aim to evaluate the environmental impact of livestock production, but also at the farm level, to manage manure storage and availability of fertilizer for crop production. Moreover, current manure production estimates from intensively reared beef calves are higher than actual production due to changes in farming systems, advances in animal genetics and feed efficiency. This study aims to redefine and update manure production estimates in intensively reared beef calves to predict manure production as a policy and planning tool, as there are no current models available. A trial was conducted to collect data on manure production during the growing-finishing period (243 d) of 54 Limousine calves (from 346.7 to 674.0 kg live weight, LW). Such data were used to develop two models to predict manure excretion: (1) a complex mechanistic model (CompM), and (2) a simplified empirical model (SimpM). Both models were evaluated against an independent dataset including a total of 4,692 animals on 31 farms and 5 breeds. Results from CompM require interpretation because the model does not output a single value but a range of manure production (minimum, medium and maximum), and would therefore be more suitable for professional use. The SimpM could be considered simple, reliable, and versatile for predicting manure excretion at farm level. SimpM could be refined and improved by including data from other studies on beef cattle with distinct characteristics and management.

关键词： Beef cattle growing-finishing calves manure production prediction process-based model empirical model.

Valorizing plastic waste by insect consumption

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circular Agricultural Systems 2021年第1期1卷 46-54页

作者： Sehroon Khan Yang Dong Sadia Nadir Douglas A.Schaefer Peter E.Mortimer Jianchu Xu Lei Ye Heng Gui Dhanushka N.Wanasinghe Gbadamassi G.O.Dossa Mingming Yu Jun Sheng Key Laboratory for Plant Biodiversity and Biogeography of East Asia(KLPB) Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanChina Centre for Mountain Futures(CMF) Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanChina State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan Yunnan Agricultural UniversityKunming 650201China Yunnan Research Institute for Local Plateau Agriculture and Industry Kunming 650201China CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMengla 666303YunnanChina State Key Lab Phytochemistry&Plant Resources West China Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanChina department of Chemistry University of Science and TechnologyBannuKPKPakistan

Insects first began evolving hundreds of millions of years ago,and aided by gut microbes,they have been consuming hydrocarbon polymers ever *** man-made plastic polymers are chemically novel,so it is reasonable that insect/microbe systems can be found or developed to degrade them ***,remediation of global plastic waste problems should involve more than just conversion into CO_(2).Some industryscale microbial enzymatic degradation of plastic polymers may yield valuable monomers,but the plastic waste starting material must be of uniform chemistry and *** adds cost to the *** insect species can be utilized for animal feed as well as human *** of these insects have the capability to degrade plastic ***,valorizing plastic wastes by producing edible insects or useful frass has largely been *** we assemble the current knowledge of plastic degradation rates by *** addition,we also show the first instance of insect degradation of polyurethane and the first identification and isolation of insect gut fungi as directly aiding insect degradation.

关键词： process polyurethane starting

The Genome of Medicinal Plant Macleaya cordata Provides New Insights into Benzylisoquinoline Alkaloids Metabolism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2017年第7期10卷 975-989页

作者： Xiubin Liu Yisong Liu Peng Huang Yongshuo Ma Zhixing Qing Qi Tang Huifen Cao Pi Cheng Yajie Zheng Zejun Yuan Yuan Zhou Jinfeng Liu Zhaoshan Tang Yixiu Zhuo Yancong Zhang Linlan Yu Jialu Huang Peng Yang Qiong Peng dinbo Zhang Wenkai Jiang Zhonghua Zhang Kui Lin Dae-Kyun Ro Xiaoya Chen Xingyao Xiong Yi Shang Sanwen Huang Jianguo Zeng National and Local Union Engineering Research Center of Veterinary Herbal Medicine Resource and Initiative Hunan Co-Innovation Center for Utilization of Botanical Functional Ingredients Horticulture and Landscape College Veterinary Medicine College Hunan Agricultural University Changsha 410128 China Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences Key Laboratory of Biology and Genetic Improvement of Horticultural Crops of the Ministry of Agriculture Sino-Dutch Joint Laboratory of Horticultural Genomics Beijing 100081 China Agricuitural Genome Institute at Shenzhen Chinese Academy of Agricultural Sciences Shenzhen 518124 China School of Pharmacy Hunan University of Chinese Medicine Changsha 410208 China MOE Key Laboratory for Biodiversity Science and Ecological Engineering and College of Life Sciences Beijing Normal University Beijing 100875 China Micolta Bioresource Inc. Changsha 410016 China Herbal Extract Engineering Research Center Changsha 410331 China Biotechnology Research Center Hunan Academy of Agricultural Sciences Changsha 410125 China Novogene Bioinformatics Institute Beijing 100083 China department of Biological Sciences University of Calgary Calgary T2N1N4 Canada National Key Laboratory of Plant Molecular Genetics National Plant Gene Research Center Institute of Plant Physiology and Ecology Shanghai Institutes forBiological Sciences Chinese Academy of Sciences Shanghai 200032 China Plant Science Research Center Shanghai Chenshan Botanical Garden Shanghai 201602 China

The overuse of antibiotics in animal agriculture and medicine has caused a series of potential threats to public health. Macleaya cordata is a medicinal plant species from the Papaveraceae family, providing a safe resource for the manufacture of antimicrobial feed additive for livestock. The active constituents from M. cordata are known to include benzylisoquinoline alkaloids （BIAs） such as sanguinarine （SAN） and chelerythrine （CHE）, but their metabolic pathways have yet to be studied in this non-model plant. The active biosynthesis of SAN and CHE in M. cordata was first examined and confirmed by feeding ^13C-labeled tyrosine. To gain further insights, we de novo sequenced the whole genome of M. cordata, the first to be sequenced from the Papaveraceae family. The M. cordata genome covering 378 Mb encodes 22,328 predicted protein-coding genes with 43.5% being transposable elements. As a member of basal eudicot, M. cordata genome lacks the paleohexaploidy event that occurred in almost all eudicots. From the genomics data, a complete set of 16 metabolic genes for SAN and CHE biosynthesis was retrieved, and 14 of their biochemical activities were validated. These genomics and metabolic data show the conserved BIA metabolic pathways in M. cordata and provide the knowledge foundation for future productions of SAN and CHE by crop improvement or microbial pathway reconstruction.

关键词： Macleaya cordata genome Benzylisoquinoline alkaloids Secondary metabolism Sanguinarine Chelerythrine Isotopic labeling