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Thèses sur le sujet « Rumen Microbiology »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 31 janvier 2023

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1

Saluzzi, Liliana. "Ecophysiology of cellulolytic bacteria in the rumen." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU542848.

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The rumen microbial populations involved in the degradation of barley straw and clover/ryegrass forage during incubation in sacco were studied by the analysis of microbial phospholipids. The results suggested that the adherent populations differed from those in the liquid phase of the rumen contents, and that the microorganisms attached to barley straw differed from those attched to clover/ryegrass. In addition, the population adherent to barley straw appeared to change during the degradative process. The latter point was supported by observations using the electron microscope. When barley str

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2

Rhéaume, John. "Rumen bacterial attachment to forage substrates and its relationship to digestibility and intake." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63187.

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3

Ellis, Jayne Elizabeth. "Studies on the metabolism of rumen climate protozoa." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305295.

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4

Karnati, Sanjay Kumar Reddy. "Application of molecular techniques to assess changes in ruminal microbial populations and protozoal generation time in cows and continuous culture." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1164662405.

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5

Cassiano, Eduardo Cuelar Orlandi. "Avaliação de anticorpos policlonais em bovinos adaptados ou não à dietas com alta proporção de carboidratos prontamente fermentescíveis após indução à acidose." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/10/10135/tde-17042014-100147/.

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O objetivo deste trabalho foi avaliar o efeito de um preparado de anticorpos policlonais (PAP) contra bactérias ruminais específicas, Streptococcus bovis e Fusobacterium necrophorum, em parâmetros ruminais da fermentação, em vacas canuladas, adaptadas ou não a uma dieta de alta proporção de carboidratos prontamente fermentescíveis, após indução à acidose. O delineamento experimental utilizado foi o quadrado latino 3X3 replicado em arranjo fatorial de tratamentos 3X2, sendo 2 aditivos alimentares (PAP na apresentação em pó - PAPP e PAP na apresentação líquida - PAPL) mais um grupo controle (CON

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6

Wiryawan, I. Komang Gede. "Microbial control of lactic acidosis in grain-fed sheep." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phw799.pdf.

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Bibliography: leaves 122-138. Investigates the use of microbial inoculants to prevent the onset of acidosis in acutely grain fed animals; and, the most effective combination of virginiamycin and lactic acid utilising bacteria (selenomonas ruminantium subsp. lactilytica and Megasphaera elsdenii) in controlling lactic acid accumulations in vitro.

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7

Gnanasampanthan, Gnanapragasam. "Immune responses of sheep to rumen ciliates and the survival and activity of antibodies in the rumen fluid." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phg571.pdf.

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Videorecording has title: Effect of antibodies on the motility of rumen ciliates. Bibliography: leaves 197-259. Consists of a review of rumen ciliates, their implications in ruminant nutrition and a description of the research methods, the results and the conclusions drawn with regard to the prospects of establishing an immunological basis for the manipulation of rumen ciliates.

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8

Robertson, J. D. "The energetics of end product excretion from a rumen bacterium, Selenomonas ruminantium." Thesis, University of Aberdeen, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373190.

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9

Hackmann, Timothy John. "Responses of Rumen Microbes to Excess Carbohydrate." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364922613.

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10

Bottrill, Stephen. "Comparative studies of oxalyl-CoA decarboxylase produced by soil and ruminal bacteria." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09ANM/09anmb751.pdf.

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Bibliography: leaves 139-167 The aim of this project was to identify an enzyme responsible for the metabolism of oxalate which would be suitable for degrading oxalate in the rumen, and clone and characterise that gene.

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11

Cersosimo, Laura Marie. "Rumen Microbial Ecology And Rumen-Derived Fatty Acids: Determinants Of And Relationship To Dairy Cow Production Performance." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/665.

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Rumen microbiota enable dairy cattle to breakdown fiber into useable energy for milk production. Rumen bacteria, protozoa, and fungi ferment feedstuff into volatile fatty acids (VFA), the main energy source, while methanogens utilize fermentation by-products to produce methane. Milk fat contains several bioactive rumen-derived fatty acids (FA), including odd-chain FA (OCFA) and branched-chain FA (BCFA), important for maintenance of human health. The overarching dissertation goal was to determine which factors affect rumen methanogen and protozoal community structures and their metabolism produ

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12

Mackintosh, E. D. "The effect of monensin on in vitro rumen fermentation and in vivo rumen and total tract digestion and milk production in the dairy cow." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265711.

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13

Edwards, Nicholas John. "Nitrogen assimilation by rumen microorganisms: a study of the assimilation of ammonia by rumen bacteria in vivo and in vitro." Title page, table of contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phe2657.pdf.

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14

Yohe, Taylor. "Performance and Development of the Rumen in Holstein Bull Calves Fed an Aspergillus oryzae Fermentation Extract." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397769968.

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15

Brown, Gordon Douglas. "The analysis of an enzyme (Ce1A) and a gene system (abg) involved in the utilization of lignocellulose in the rumen." Doctoral thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/9244.

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Bibliography: leaves 150-183.<br>As lignocellulose represents an abundant renewable resource, research is in progress to obtain a better understanding of the natural mechanisms whereby this resource is utilised. Of particular interest is the degradation of forage in the rumen and one research goal is to ultimately increase animal productivity through an improvement in lignocellulose utilisation. However, although the mechanisms behind lignocellulose utilisation are reasonably well understood, relatively little is known about the mechanisms which occur in the rumen. Thus, the aim of this thesis

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16

Roman-Garcia, Yairanex. "Assessing Dietary Conditions Influencing the Requirements by Rumen Bacteria for Branched Chain Volatile Fatty Acids." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1557171743925883.

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17

Stieve, Dale Edward M. "Protein preservation and rumen degradability of ensiled forage, previously treated with microwave or steam heat, formic acid, or anhydrous ammonia." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10312009-020048/.

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18

Tomlinson, Dana J. "Effect of nonstructural carbohydrates and rumen undegradable protein on intake, growth, and body condition of dairy heifers." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135549/.

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Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1990.<br>Vita. Abstract. No film copy made for this title. Includes bibliographical references (leaves 149-165). Also available via the Internet.

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19

Strauss, Colin Earl, and University of Lethbridge Faculty of Arts and Science. "Development of Pichia pastoris as a ruminal escape vehicle." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2000, 2000. http://hdl.handle.net/10133/148.

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The yeast expression system Pichia pastoris was investigated as an encapsulation technology capable of serving as a rumen escape vehicle. Cellularly encapsulated protein is protected from the ruminal environment so long as the cell membrane, which surrounds and isolates the intracellular protein is physically intact. Intracellular expression of Green Fluorescent Protein (GFP) allows for the monitoring of cellular integrity as necessary for the protection of encapsulated protein from ruminal proteases. Upon cellular lysis GFP is exposed to extracellular proteases which result in both the proteo

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20

Janicki, Francis John. "Fiber and nitrogen fractions of forages and by-product feeds determined by in vitro and in situ procedures." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49798.

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21

Pellegrini, Suzanne Ishaq. "A Comparative Analysis Of The Moose Rumen Microbiota And The Pursuit Of Improving Fibrolytic Systems." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/365.

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The goal of the work presented herein was to further our understanding of the rumen microbiota and microbiome of wild moose, and to use that understanding to improve other processes. The moose has adapted to eating a diet of woody browse, which is very high in fiber, but low in digestibility due to the complexity of the plant polysaccharides, and the presence of tannins, lignin, and other plant-secondary compounds. Therefore, it was hypothesized that the moose would host novel microorganisms that would be capable of a wide variety of enzymatic functions, such as improved fiber breakdown, metab

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22

Wlodarski, Leticia. "Determinação e quantificação de protozoários ciliados e bactérias do rúmen de bovinos em pastagens temperadas e tropicais." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2457.

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CAPES<br>O objetivo do presente trabalho foi identificar e quantificar os protozoários ciliados e bactérias do rúmen de bovinos cruzados (Europeu x Nelore), com média de 2,5 anos, alimentados em pastagens de inverno (Azevém e Aveia + Azevém) e verão (Brachiaria spp. e Brachiaria spp. + Esrela Africana). Amostras de conteúdo ruminal foram obtidas do centro da massa ruminal, após o abate dos animais. A contagem de bactérias totais (CBT), para as frações sólida e para líquida, foi realizada em placas com auxílio de contador de colônias manual. Para a análise morfológica empregou-se a técnica de c

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23

Wang, Pan. "Transcriptomic and metatranscriptomic approaches to characterizing genes coding for fiber digestion within the rumen ecosystem." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, 2013. http://hdl.handle.net/10133/3459.

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The rumen microbiome constitutes a unique genetic resource of plant fiber degrading microbial enzymes that could be used for agricultural and industrial purposes. Anaeromyces mucronatus is a poorly characterized anaerobic lignocellulolytic fungus in the rumen. This thesis aimed at better understanding A. mucronatus YE505 and the particle associated rumen microbiota based on transcriptomic and metatranscriptomic approaches. High quality RNA was isolated from the fiber-associated rumen sample based on an improved RNA extraction method. A transcriptomic study was performed to investigate the expr

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24

Sewalt, Vincent Johannes Hendrikus. "Impact of lignification of corn stover fractions on cell wall degradation by rumen microorganisms and response to ammonia treatment." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40105.

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25

Park, Tansol. "Towards a Better Understanding of the Metabolism, Physiology, and Ecology of Rumen Protozoa: New Insights from Culturomics and Genomics." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1511959620750916.

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26

Christophersen, Claus. "Grain and artificial stimulation of the rumen change the abundance and diversity of methanogens and their association with ciliates." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0114.

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[Truncated abstract] In Australia, there is pressure to reduce the amount of methane produced by ruminant livestock because they are the single largest source of methane emitted from anthropogenic sources, accounting for 70.7% of agricultural methane emissions. In addition, methane production represents a loss of gross energy intake to the animal. The organisms that are responsible for methane production in the animal gut are a distinct group of Archaea called methanogens. Methanogens occupy three different niches within the rumen. Some live freely in the rumen digesta (planktonic), others are

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27

Solden, Lindsey M. "Uncovering New Players and New Roles in Microbial Anoxic Carbon Transformations." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523974278334632.

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28

Sadik, Mohamad Shabir 1959. "MICROBIAL PROTEIN FLOW TO THE SMALL INTESTINE OF COWS FED DIFFERENT PROTEIN SUPPLEMENTS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/292012.

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Three duodenally cannulated lactating Holstein cows fed cotton-seed meal (CSM), corn gluten meal (CGM) or blood meal (BM) as protein supplement were used in a 3 x 3 Latin Square experiment to determine microbial crude protein (MCP) in duodenal digesta. Diets, formulated to contain 15% crude protein (CP) on a dry matter basis, consited of 60% concentrate, 31% corn silage and 9% alfalfa hay. Chromium oxide was employed as flow marker. Microbial protein fraction of digesta CP (MCP/DCP) was estimated by three microbial markers: ¹⁵N, diaminopimelic acid (DAP) and ribonucleic acid (RNA). The isotopi

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29

Fowler, Colleen Marie. "Evaluation of 2-Hydroxy-4-(methylthio) Butanoic Acid Isopropyl Ester and Methionine Supplementation on Efficiency of Microbial Protein Synthesis and Rumen Bacterial Populations." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1248875016.

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30

Reis, Cândida Camila dos. "Protozoários ciliados no rúmen de bovinos Nelore e Cruzados Nelore x Europeu sob diferentes sistemas de alimentação." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/2445.

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CAPES<br>O objetivo do presente trabalho foi identificar e quantificar os protozoários ciliados do rúmen de dois grupos genéticos de bovinos de corte (Nelore e Cruzados Nelore x Europeu), sob três sistemas de alimentação (confinado, à pasto e à pasto com suplemento). Amostras de conteúdo ruminal foram obtidas do centro da massa ruminal, após o abate dos animais. A quantificação e identificação dos gêneros de ciliados foram realizadas em câmara de contagem Sedgewick-Rafter em microscopia ótica. Foi determinado o conteúdo de matéria seca (MS), proteína bruta (PB), extrato etéreo (EE), matéria mi

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31

Nili, Nafisseh. "Limitations to amino acid biosynthesis de novo in ruminal strains of Prevotella and Butyrivibrio." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phn712.pdf.

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Bibliography: leaves 226-261. Investigates nitrogen utilization in some species of rumen bacteria with the object of understanding the role of ammonia versus exogenous amino acids in relation to microbial growth.

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Hutton, Peter. "Antimicrobial plants of Australia have the potential to prevent lactic acidosis in ruminants." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0159.

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[Truncated abstract] Antimicrobial growth promoters are added to feed to prevent lactic acidosis in ruminant animals by selectively inhibiting rumen bacteria that produce lactic acid. However, recently imposed or impending bans on the use of antimicrobial growth promoters in animal production have lead to a critical need to find practical alternatives that are safe for the animal and consumer and that obtain similar production benefits. I investigated bioactive plants of Australia for their potential to prevent lactic acidosis in ruminants. The unifying hypothesis tested was that plants would

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33

Malan, Marcia. "The effect of sugar, starch and pectin as microbial energy sources on in vitro forage fermentation kinetics." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/4028.

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Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: Ruminants have a compound stomach system that enables them to utilize forages more efficiently than monogastric animals. However, forages alone do not contain sufficient nutrients to meet the requirements of high producing dairy cows. Forages are high in fibre and their nutrient availability depends on the degree of cell wall degradability. Improvements in forage fermentation would increase energy intake and subsequently milk production and performance by dairy cows. It is therefore important to fin

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Reis, William Lima Santiago dos. "Efeito da suplementação proteica em bovinos consumindo forragens tropicais sobre a degradação da fibra insolúvel, atividade de enzimas fibrolíticas e perfil da comunidade microbiana ruminal." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/5811.

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Made available in DSpace on 2015-03-26T13:55:24Z (GMT). No. of bitstreams: 1 texto completo.pdf: 614632 bytes, checksum: eac726a0efd1eec87578c9745a474e81 (MD5) Previous issue date: 2014-02-26<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>This work aimed to evaluate the effects of ruminal and/or abomasal protein supplementation in cattle fed tropical forages on nutritional variables, degradation of insoluble fiber, activity of fibrolytic enzymes and rumen bacterial communities profile. Two experiments were carried out sequentially, and in the same way, differing only on

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Héritier-Freche, Corine. "Etude in vitro de la protéolyse par les bactéries du rumen." Vandoeuvre-les-Nancy, INPL, 1990. http://www.theses.fr/1990INPL019N.

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Léquilibre de l'écosystème ruminal est sous la dépendance des interactions microbiennes. Parmi les bactéries du rumen, nous avons choisi d'étudier celles responsables de la dégradation des matières azotées. Nos expérimentations ont abouti à la sélection de bactéries protéolytiques : bactéroides ruminicola, anaérobie strict; streptococcus bovis, anaérobie facultatif; bacillus sp2, aérobie. L'activité protéasique de ces microorganismes se manifeste d'abord sur les unités de haut poids moléculaire des protéines testées (caséine, blé, maïs et soja). Toutefois, l'intensité de la protéolyse est dire

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Fassih, Aicha. "Effet de l'addition de serum de luzerne sur l'activité microbienne du rumen." Rennes 1, 1990. http://www.theses.fr/1990REN1A003.

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Gomez, de Segura Béatrice. "Caractérisation biochimique du système xylanolytique d'un champignon anaérobie du rumen : Neocallimastix frontalis." Lyon 1, 1993. http://www.theses.fr/1993LYO10085.

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Les champignons anaerobies du rumen produisent et secretent un systeme d'enzymes hydrolytiques capables de degrader les parois cellulaires vegetales de la nourriture des ruminants. Notre travail a porte sur le genre le plus etudie jusqu'a present: neocallimastix frontalis. Ce champignon produit toute une panoplie d'enzymes lytiques. Parmi ces enzymes, 7 glycosidases et 3 polysaccharidases ont ete etudiees. Ces enzymes lytiques se caracterisent par leur grande efficacite dans l'hydrolyse de substrats cellulosiques ou hemicellulosiques, liberant des sucres simples directement assimilables. D'aut

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Ouaffai, Aïssa. "Rendement de la transformation en matières azotées microbiennes des matières azotées alimentaires dégradées dans le rumen." Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10076.

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Etude de la protéosynthèse dans un rusitec (qui est un rumen artificiel en écoulement semi-continu) en comparant le taux d'azote total de bactéries isolées à partir d'effluents journaliers avec le taux d'azote des aliments. La protéosynthèse microbienne augmente de façon linéaire avec le temps dans le rusitec

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Sales-Duval, Muriel. "Effets des interdépendances nutritionnelles entre bactéries protéolytiques sur l'efficacité de la protéolyse dans le rumen." Vandoeuvre-les-Nancy, INPL, 2000. http://www.theses.fr/2000INPL137N.

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La nutrition et la physiologie des ruminants sont étroitement liées au résultat des interactions entre les bactéries du rumen. En effet, la composition des régimes alimentaires affecte directement la dégradation des protéines contenues dans la ration, conséquemment à une modification de la flore dominante du contenu ruminal. La fourniture de 2 rations à base de pois a 4 brebis a montré une augmentation de 30% de l'activité protéolytique totale dans le rumen avec le régime conduisant a la plus faible teneur an ammoniac. Cet accroissement est du a une augmentation des activités exopeptidasiques

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Jesus, Raphael Barbetta de [UNESP]. "Diversidade bacteriana ruminal em bovinos Nelore." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/115594.

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Made available in DSpace on 2015-03-03T11:52:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-07-01Bitstream added on 2015-03-03T12:07:26Z : No. of bitstreams: 1 000811366.pdf: 358045 bytes, checksum: 9cd1f999c10e551e3f1a2870a24607d9 (MD5)<br>O rúmen é um ecossistema aberto, no qual o alimento consumido pelos ruminantes é fermentado a ácidos graxos de cadeia curta e proteína microbiana, os quais servem respectivamente como fonte de energia e de proteína para o animal. Espécies de micro-organismos têm desenvolvido no rúmen uma série de interações complexas, o qual é um dos melhores e

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Hébraud, Michel. "Production et caractérisation des hydrolases sécrétées par les champignons anaérobies du rumen." Lyon 1, 1988. http://www.theses.fr/1988LYO10173.

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Etude des hydrolases de trois especes de phycomycetes anaerobies du rumen de mouton, neocallimastix frontalis, sphaeromonas communis et piromonas communis: caracterisation physicochimique, regulation de la synthese et de la secretion. Purification de la beta -glucosidase, de la beta -fucosidase et de la beta -xylosidase de n. Frontalis

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Castagnino, Pablo de Souza. "Performance, carcass traits and rumen fermentation from feedlot nellore cattle fed crude glycerin and virginiamycin /." Jaboticabal, 2018. http://hdl.handle.net/11449/152871.

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Orientador: Telma Teresinha Berchielli<br>Coorientador: Giovani Fiorentini<br>Banca: Saulo da Luz e Silva<br>Banca: Otavio Rodrigues Machado Neto<br>Banca: Paulo Henrique Moura Dian<br>Banca: Juliana Duarte Messana<br>Resumo: O glicerol é um substrato utilizado por bactérias que metabolizam o lactato ruminal e a virginiamicina é um antibiótico não ionóforo que inibe o crescimento de bactérias gram-positivas produtoras de lactato. Foram realizados dois experimentos para avaliar os efeitos da glicerina bruta (GB) e da virginiamicina (VM) na ingestão, digestibilidade, fermentação ruminal, populaç

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Debroas, Didier. "Activité protéolytique des bactéries du rumen : étude de l'hydrolyse des protéines des parois végétales." Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL009N.

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Les bactéries protéolytiques sont essentiellement du genre bactéroïdes rumincola, streptococcus bovis butyrivibrio fibrisolvens et clostridium bifermentans. Les enzymes protéolytiques synthétisées par clostridium bifermentans s 17/2 sont essentiellement des cystéines protéases. Une part de l'activité est due à des métallo et serine proteases. L'activite enzymatique est maximale entre ph 7 et 8,5. Elle se maintient à un niveau élevé (sup. 79%) sur le plage de ph assez large (ph 5 a 9). L'activité protéolytique est activée par le glucose et réprimée par les sources azotées (acides amines, peptid

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Ribeiro, Júnior Carlos Stefenson [UNESP]. "Quantificação de microrganismos ruminais de novilhos alimentados com cana-de-açúcar ou feno de tifton com diferentes relações volumoso:concentrado." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110729.

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Made available in DSpace on 2014-11-10T11:10:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-04-22Bitstream added on 2014-11-10T11:57:23Z : No. of bitstreams: 1 000791240.pdf: 1034820 bytes, checksum: 4b0b273b843efc0acef3c24358ec0816 (MD5)<br>Objetivou-se com este estudo caracterizar as alterações na microbiota ruminal, parâmetros ruminais, consumo, digestibilidade das dietas e a eficiência de síntese microbiana, em novilhos Nelore confinados alimentados com diferentes relações volumoso:concentrado, utilizando como fontes de volumoso o feno de Tifton 85 ou cana-de-açúcar. Foram rea

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Teixeira, César Roberto Viana. "Comparing the responses of rumen ciliate protozoa and bacteria to excess glucose." Universidade Federal de Viçosa, 2018. http://www.locus.ufv.br/handle/123456789/22141.

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Submitted by MARCOS LEANDRO TEIXEIRA DE OLIVEIRA (marcosteixeira@ufv.br) on 2018-10-04T17:24:07Z No. of bitstreams: 1 texto completo.pdf: 1726508 bytes, checksum: b215614a17770465d875d305244f584b (MD5)<br>Made available in DSpace on 2018-10-04T17:24:07Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1726508 bytes, checksum: b215614a17770465d875d305244f584b (MD5) Previous issue date: 2018-06-29<br>Os microrganismos ruminais têm um papel central na nutrição de ruminantes. Eles têm a capacidade de fermentar componentes do alimento para produzir ácidos graxos voláteis (AGV’s) e crescer (sin

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Guy, Christine. "Etude et modélisation des produits du métabolisme microbien et de la dégradation des composés pariétaux en fermenteur semi-continu par les microorganismes du rumen." Toulouse, INPT, 1988. http://www.theses.fr/1988INPT018G.

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Rismani-Yazdi, Hamid. "Bioconversion of cellulose into electrical energy in microbial fuel cells." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1211313869.

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Alves, de Oliveira Laurent. "Effets de l'acidose chronique et d'un excès de sulfate sur le métabolisme microbien de la thiamine dans le rumen." Lyon 1, 1997. http://www.theses.fr/1997LYO10226.

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L'objectif de ce travail est de contribuer a l'etude de l'etiologie de la necrose du cortex (ncc) en determinant les effets de l'acidose ruminale et d'une quantite elevee de sulfate sur le metabolisme de la thiamine dans le rumen. La premiere partie du travail experimental a ete consacree a l'adaptation d'une technique de dosage hplc pour determiner les concentrations de thiamine et de ses esters phosphates dans le milieu ruminal. Dans une seconde partie, l'effet de l'acidose chronique et d'une dose elevee de soufre (sous forme de sulfate), en presence ou en l'absence de thiamine, a ete etudie

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Julien, Christine. "Interactions entre la composition de la ration et les levures vivantes Sc47 (ACTISAF®) : effets sur le statut oxydo-réducteur et l’activité fermentaire dans le rumen chez la vache laitière." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0076.

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L'objectif de ce travail est de caractériser l'effet des levures vivantes Sc47 sur le métabolisme ruminal et l'utilisation digestive de la ration en lien avec le statut oxydo-réducteur du rumen chez des vaches laitières recevant des rations qui diffèrent dans leur composition. En effet, le milieu ruminal est très anaérobie et réducteur : les micro-organismes qui s'y développent sont à l'origine de ces conditions physico-chimiques particulières caractérisées par des valeurs de potentiel rédox (Eh) ou indice de Clark (rH) basses : respectivement dans cette étude entre –213 et –147 mV et entre 6.

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Huang, Yayu. "Effect of live yeast on the fermentation and microbiological physico-chemical parameters of the rumen, depending on the nature of the diet : modeling and validation in ruminant." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0003.

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L'acidose ruminale est l'une des préoccupations majeures des exploitations laitières actuelles. Les levures vivantes (LV) ont été largement étudiées et utilisées chez les vaches laitières pour stabiliser la fermentation ruminale. Récemment, la mesure du potentiel redox ruminal (Eh, en mV) a été considérée comme un outil intéressant pour indiquer le trouble de la fermentation ruminale. L'effet positif de LV sur Eh ruminal a été rapporté, mais il reste variable selon les conditions expérimentales. Les objectifs de ce travail étaient de fournir une meilleure compréhension du mode d'action de LV e

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