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Tesis sobre el tema "Dairy microbiology"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

McAstocker, Michael. "The effects of dietary dairy products on mammalian cholesterol metabolism." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317559.

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2

Sarhan, Hassan Raheem. "Rapid fluorogenic methods for the detection of Escherichia coli in dairy products and water supply." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258363.

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3

Coklin, Tatjana. "Detection and molecular characterization of Giardia and Cryptosporidium in Canadian dairy cattle." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27823.

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Giardia and Cryptosporidium are intestinal protozoan parasites that infect a wide range of host species, including humans. DNA sequencing of Giardia and Cryptosporidium isolates from human and animal sources has identified numerous species and genotypes, and has demonstrated that a number of Giardia and Cryptosporidium genotypes are shared between animals and humans. Therefore, livestock may act as a source of contamination of the food and water supply. The goal of this study was to optimize methods for the detection and molecular characterization of Giardia and Cryptosporidium. Achieving thi

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4

Davidse, Elton (Elton Kurt). "Prevention and treatment of mastitis in dairy cows with bacteriocins produced by Enterococcus faecalis." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16296.

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Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: The effect of the bacteriocin-like peptide AS-48, produced by Enterococcus faecalis FAIRE 92, was tested against a mastitis isolate of Staphylococcus aureus in an in vivo and in vitro study. During initial tests peptide AS-48 showed no significant activity towards S. aureus, even with a ten-fold concentrated cell-free supernatant. Activity was obtained only after purification with Triton X-114 phase partitioning, followed by cation exchange chromatography. Titers for the purified peptide varied between 3200 and 12800 AU

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5

Sanchez, Luis R. "Removal of bacterial indicators and pathogens from dairy wastewater by a treatment system." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284075.

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An integrated wastewater treatment facility at a dairy in Glendale, Arizona, consisting of an upper subsystem (solids separators, anaerobic lagoons, and aerobic ponds) and lower subsystem (wetland subsystems) has been proven to be successful in reducing indicator organisms and potential pathogens (bacteria, enteric viruses, and parasites). The collection sump of the new integrated system collects all dairy wastewater and pumps it to solid separators, which then flows by gravity to anaerobic lagoons and aerobic ponds. The upper subsystem achieved significant microbial reductions of >98 percent

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6

Manshadi, Faezeh Dehghan. "Occurence of pathogenic and indicator microorganisms on produce irrigated with dairy wastewater." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289980.

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This project was designed to assess the potential for contamination of produce during irrigation with wastewater from animal operations. Dairy wastewater from the University of Arizona Campus Dairy Research Center was used to irrigate three different types of vegetable crops: lettuce, carrot, and bell pepper. This study was conducted over two consecutive years. The crops were planted in February and vegetables were harvested from May through July. Irrigation water and vegetable samples were examined for Escherichia coli, Clostridium perfringens, Listeria monocytogenes, and coliphage. In the d

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7

Mosteller, Tracy M. "Sanitizer efficacy towards attached bacteria in a simulated milk pipeline system using pure and mixed cultures." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-08062007-094410/.

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8

Mugabi, Robert. "Genotypes And Phenotypes Of Staphylococci On Selected Dairy Farms In Vermont." ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/844.

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The genus Staphylococcus contains at least 47 species and 23 subspecies. Bacteria in this genus are ubiquitous; many are commensals on human and animal skin and can be opportunistic pathogens. In dairy cattle, staphylococci are the leading cause of intramammary infections (IMI) and mastitis. Mastitis is the inflammation of the mammary gland, and is one of the leading infectious diseases causing production losses in the dairy industry. Based on the ability to clot blood plasma in vitro, members of the genus can be divided into two groups: coagulase positive staphylococci (CPS) and coagulase neg

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9

Yam, Godward Georgia Nga-Mun. "Studies on enhancing the viability and survival of probiotic bacteria in dairy foods through strain selection and microencapsulation." Thesis, View thesis View thesis, 2000. http://handle.uws.edu.au:8081/1959.7/411.

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In this study, strains of probiotic bacteria have been selected for tolerance to low pH, bile, sucrose, oxygen in media and low storage temperatures. Lactobacillus acidophilus 2401 and Bifidobacterium infantis 1912 were selected as strains able to survive in these conditions. These two strains were then offered further protection from the adverse conditions of food processing and storage by microencapsulation in a calcium alginate and starch gel matrix. Encapsulation in calcium alginate increases survival in yoghurt. In cheddar cheese the free L. acidophilus 2401 and B. infantis 1912 cells sur

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10

Yam, Godward Georgia Nga-Mun, of Western Sydney Hawkesbury University, Faculty of Science and Technology, and of Science Food and Horticulture School. "Studies on enhancing the viability and survival of probiotic bacteria in dairy foods through strain selection and microencapsulation." THESIS_FST_SFH_YamGodward_G.xml, 2000. http://handle.uws.edu.au:8081/1959.7/411.

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In this study, strains of probiotic bacteria have been selected for tolerance to low pH, bile, sucrose, oxygen in media and low storage temperatures. Lactobacillus acidophilus 2401 and Bifidobacterium infantis 1912 were selected as strains able to survive in these conditions. These two strains were then offered further protection from the adverse conditions of food processing and storage by microencapsulation in a calcium alginate and starch gel matrix. Encapsulation in calcium alginate increases survival in yoghurt. In cheddar cheese the free L. acidophilus 2401 and B. infantis 1912 cells sur

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11

Yam, Godward Georgia Nga-Mun. "Studies on enhancing the viability and survival of probiotic bacteria in dairy foods through strain selection and microencapsulation /." View thesis View thesis, 2000. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030428.112849/index.html.

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Thesis (M.Sc.) (Hons.) -- University of Western Sydney, Hawkesbury, 2000.<br>A thesis presented for the fulfilment of Master of Science (Honours), Centre for Advanced Food Research, School of Science, Food and Horticulture, University of Western Sydney, Hawkesbury, December 2000. Spine title : Survival of probiotic bacteria in dairy foods. Bibliography : leaves 228-244.

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12

Pieterse, Renee. "Control of bacterial pathogens associated with mastitis in dairy cows with natural antimicrobial peptides produced by lactic acid bacteria." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/2323.

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Thesis (MSc (Microbiology))--Stellenbosch University, 2008.<br>Mastitis is considered to be the most costly disease affecting the dairy industry. Management strategies involve the extensive use of antibiotics to treat and prevent this disease. Prophylactic dosages of antibiotics used in mastitis control programmes could select for strains with resistance to antibiotics. In addition, a strong drive towards reducing antibiotic residues in animal food products has lead to research in finding alternative antimicrobial agents. Streptococcus macedonicus ST91KM, isolated from bulgarian goat yog

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13

Cameron, Michelle. "Impact of low-frequency high-power ultrasound on spoilage and potentially pathogenic dairy microbes." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/597.

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14

Hayward, Stefan. "Partial characterization of a bacterial acyltransferase enzyme for potential application in dairy processing." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86636.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: This study describes: the evaluation of the current, and potential assay methods for the quantification of cholesterol, cholesteryl esters and free fatty acids in milk and the application thereof ; an account of the difficulties associated with the usage of FoodPro® Cleanline, an enzyme preparation used as processing aid, during ultra-high temperature processing of milk ; the development of activity assays which can be used for the kinetic characterization of glycerophospholipid cholesterol acyltransferase, the active enzy

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15

Lippens, Wim. "Rapid Detection of Listeria monocytogenes." DigitalCommons@USU, 2003. https://digitalcommons.usu.edu/etd/5491.

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Listeria monocytogenes is a foodbome pathogen that can cause severe illness and even death. It is found in dairy and meat products. The focus is on rapid detection since conventional methods are time consuming (4-5 days). Pre-enrichment steps, as part of those methods, are time consuming. Our objective was to develop a detection system without a pre-enrichment step, giving a final result within 2 to 4 h. In the concept of "the need for speed," a detection system with an antibody-based capture technique, followed by polymerase chain reaction (PCR), was developed. Glass beads coated with a Liste

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16

Tanih, Godfred Ngu. "Genotypic and phenotypic characterization of enterococci from cow dung and environmental water sources in three selected dairy farms in Amathole District." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/2348.

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Enterococcus species are integral members of the gastrointestinal microfloral of humans, animals, birds, as well as insects. Their presence in water and food has been greatly associated with faecal contamination. This study was aimed at evaluating the incidence of Enterococcus species in cow dung and environmental water sources in three commercial dairy farms. In addition, their antibiotic profiles were determined as well as resistance and virulence genes. Furthermore, the genetic relatedness of the isolates was determined by molecular typing method (RAPD PCR). Three hundred and thirty four wa

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17

Borchers, Matthew Richard. "THE EFFECTS OF HOUSING ON DAIRY COW COMFORT, IMMUNE FUNCTION, STRESS, PRODUCTIVITY, AND MILK QUALITY." UKnowledge, 2018. https://uknowledge.uky.edu/animalsci_etds/93.

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Mastitis and milk quality affect every dairy farmer across the globe. Sand bedded freestalls are the industry standard for cow comfort, welfare, and the control of environmental mastitis. Compost bedded packs may be a viable alternative to the sand bedded freestall. Compost bedded packs are maintained at a consistent level of moisture, nutrients, and aeration to favor compost microorganisms. Greater bacteria counts in bedding have traditionally been associated with increased mastitis rates and mastitis pathogens can be found in the pack and on the teats of cattle housed in even well managed co

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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

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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20

Mussa, Dinna Mathemi. "High pressure processing of milk and muscle foods : evaluation of process kinetics, safety and quality changes." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35473.

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High pressure (HP) kinetics of the microbial destruction and changes in the physicochemical characteristics of milk and pork were studied. Raw milk samples containing indigenous microflora of approximately 106 CFU/mL were heat sealed in dual peel sterilization pouches and subjected to HP treatment from 150--400 MPa with holding times ranging 5--120 min. The kinetic parameters (rate constant, k and decimal reduction time, D) for the microorganisms, alkaline phosphatase, color and viscosity were evaluated, based on first order kinetics and the pressure dependence of kinetic parameters was evalua

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21

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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22

Jawad, Emad. "Technological benefits and potential of incorporation of probiotic bacteria and inulin in soft cheese." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/4377.

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There is an increasing consumer demand for dairy products which are safe and free from additives. Microbial starter strains, in combination with other factors, were studied for their contribution to the control of unwanted microbes, and maintaining the quality of soft cheese. The technological and functional characteristics of the starter culture strains Lactococcus lactis subsp. lactis and Lactococcus lactis subsp. cremoris, and probiotic bacterial strains Bifidobacterium animalis subsp. lactis BB12, Lactobacillus acidophilus LA-5 and Lactobacillus casei Shirota were investigated. The tests i

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23

Mokoena, Kingsley Katleho. "Airborne microbiota and related environmental parameters associated with a typical dairy farm plant." Thesis, Bloemfontein : Central University of Technology, Free State, 2013. http://hdl.handle.net/11462/160.

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Thesis (M. Tech. (Environmental health: Food safety )) - Central university of Technology, Free State, 2013<br>Food processing plants and agricultural environments have a long-standing history of being known to provide a conducive environment for the prevalence and distribution of microorganisms which emanate as a consequence of activities undertaken in such premises. Microorganisms in the aforementioned environments may be found in the atmosphere (airborne), and/or on food contact surfaces. Airborne microorganisms from food handlers and in food products and raw materials (as part of bioaeros

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24

Javorski, Cleovani Rossi. "Utilização de resíduo úmido de fécula de mandioca na dieta de vacas holandesas em lactação." Universidade Estadual do Oeste do Paraná, 2012. http://tede.unioeste.br:8080/tede/handle/tede/1526.

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Made available in DSpace on 2017-07-10T17:47:51Z (GMT). No. of bitstreams: 1 Cleovani_Rossi_Javorski.pdf: 1250876 bytes, checksum: 7c0e35565225da95caae3718c60f9ed1 (MD5) Previous issue date: 2012-12-13<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In dairy farming, one of the factors that raise the cost of production is feed, which can reach 70% of the total cost. With this, it is necessary to look for alternatives to reduce these costs without sacrificing productivity. An alternative is to enrich food resources of the animals, through the use of byproducts of industria

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25

Thomson, Sean Richard. "Methane Production by a Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1329.

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Packed-bed digesters are an alternative to covered lagoon digesters for methane production and anaerobic treatment of dilute wastewaters such as dairy barn flush water. The physical media of packed-beds retain biofilms, often allowing increased treatment rates. Previous studies have evaluated several types of media for digestion of dilute wastewaters, but cost and media fouling have setback commercial development. A major operational cost has been effluent recirculation pumping. In the present effort, a novel approach to anaerobic digestion of flush dairy water was developed at pilot-scale:

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26

Moreno, Izildinha. "Efeito de autólise de culturas lácticas na proteólise do queijo Prato." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/9/9131/tde-01092016-175444/.

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Nesta pesquisa, estudaram-se as variações ocorridas na relação entre autólise de culturas lácticas e o desenvolvimento da proteólise de queijo Prato produzido em quatro regiões brasileiras: Santa Catarina (Queijo A), Goiás (Queijo B), São Paulo (Queijo C) e Minas Gerais (Queijo D). A análise quantitativa da população de bactérias lácticas durante a maturação mostrou perfis microbiológicos similares para todas as amostras de queijos examinadas. Após 5 dias de maturação, lactococos e estreptococos estavam presentes em números mais elevados do que lactobacilos mesofílicos e termofílicos, leuconos

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27

El, Tholth Mahmoud Mohammed El Sayed. "Microbiological risk assessment at the human-animal interface : assessment of human exposure to Mycobacterium avium subspecies paratuberculosis, highly pathogenic avian influenza virus subtype HN51 and Brucella spp." Thesis, Royal Veterinary College (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558962.

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28

Beard, Martin Gale. "The impact of intrinsic and extrinsic factors on the safety and quality of hard and semi-soft natural cheese." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1422.

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29

Souto, Luís Ivan Martinhão. "Associação entre o índice de mastite em rebanhos bovinos leiteiros e a qualidade microbiológica do leite cru no Estado de São Paulo, Brasil." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/10/10134/tde-30052007-152355/.

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O objetivo deste trabalho foi verificar as possíveis correlações entre os índices de mastite e a qualidade microbiológica do leite cru, em 36 propriedades com atividade exploratória leiteira, no Estado de São Paulo, Brasil. Examinou-se 4662 quartos mamários de 1180 animais em lactação para se verificar a presença de mastite pelos Testes de Caneca de Fundo Escuro e CMT, e coletou-se uma amostra de cada quarto mamário positivo em pelo menos um dos testes para exame microbiológico. Para se avaliar a qualidade microbiológica do leite cru, coletou-se uma amostra de cada propriedade e fez-se a Conta

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30

Shoukat, Mahtab. "Le fer comme modulateur de l'écosystème microbien du fromage." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASB009.

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Résumé : Le fer est essentiel à la croissance et à la survie de nombreux micro-organismes dans l'environnement, car il sert de cofacteur dans diverses voies métaboliques, notamment la respiration et le cycle TCA. Le fromage est toutefois caractérisé par une très faible teneur en fer, encore limitée par la présence de diverses protéines liant les métaux. Cette limitation a un impact significatif sur la croissance et l'activité de plusieurs micro-organismes impliqués dans l'affinage du fromage, des recherches antérieures ayant identifié le fer comme un facteur limitant la croissance de micro-org

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31

Munoz, Vargas Lohendy M. "Impact of Metabolic Stress, Microbiome, and Lymph Node Colonization on Salmonella Shedding in Dairy Cattle." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492625962680584.

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32

Louw, Celmarie. "Factors influencing the bacteriological quality of raw milk produced on dairy farms in Central South Africa." Thesis, Bloemfontein : Central University of Technology, Free State, 2013. http://hdl.handle.net/11462/204.

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Thesis (M. Tech. (Environmental health)) - Central University of technology, Free State, 2013<br>Introduction Dairy farms in central South Africa produce a substantial amount of milk, which is sold in Bloemfontein, Free State. Large volumes of unpasteurized (raw) milk is collected on the dairy farms, which undergoes further processing before it reaches the consumer at the end of the production line. There is a large proportion of the population that, in most cases unknowingly, consumes raw milk that has bacterial counts substantially higher than legal standards. Poor quality unpasteurized m

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33

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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34

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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35

Winckler, João Pedro Pereira. "Estratégias de vedação e adição de benzoato de sódio no controle de perdas em silagens de milho e desempenho de vacas leiteiras." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-17092015-145557/.

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Estratégias de vedação tem sido adotadas com o intuito de reduzir a entrada de oxigênio para o interior dos silos. Aditivos químicos como o benzoato de sódio, que apresenta funções antimicrobianas também pode ser empregado para melhoria da estabilidade aeróbia de silagens. Porém, ainda não se sabe se pode causar efeitos adversos no consumo ou metabolismo dos animais alimentados e, consequentemente levar a alterações no desempenho animal. Desta forma no presente estudo, objetivou-se avaliar a influência de estratégias de vedação de silos trincheira sobre as perdas de MS e valor nutritivo de sil

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36

Roncatti, Roberta. "Desenvolvimento e caracterização do queijo Santo Giorno, típico do sudoeste do Paraná, produzido com leite cru e fermento endógeno." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/1773.

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Duas formulações de queijo de leite cru e fermento endógeno foram produzidas e avaliadas após 30, 60 e 180 dias de armazenamento em câmaras de maturação de dois laticínios do Sudoeste do Paraná foram estudadas para avaliar as características, como uma das etapas de desenvolvimento de um queijo típico regional. A produção foi acompanhada desde a elaboração do fluxograma de processamento, coleta das amostras de queijo para realização de análises de proteína, lipídeos, umidade, cinzas, carboidratos, extrato seco total, gordura no extrato seco, calorias; atividade de água, textura instrumental (du

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37

Effati, Pedram. "Survey Of Genes Of Escherichia Coli Causing Bovine Mastitis With DNA Microarrays." Thesis, Uppsala universitet, Institutionen för medicinsk biokemi och mikrobiologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-154988.

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Background: Mastitis in dairy cattle is a common ailment worldwide. A cause of mastitis can be bacteria such as Escherichia coli. Mastitis is not a deadly ailment and sometimes the dairy cows show no symptoms but if certain virulence genes are present in the bacteria that cause the mastitis, the bacteria can be transmitted to humans and cause severe diseases. The potential presence of enterohemorrhagic Escherichia coli (EHEC) in particular would be a major concern for human health. Aim: The aim for this study was to analyze the presence of virulence genes known to be present in E.coli strains

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38

Jaudou, Sandra. "Metadetect : detection of Shiga toxin-producing Escherichia coli with novel metagenomics approaches and its application on dairy farms in France and Germany." Electronic Thesis or Diss., Maisons-Alfort, École nationale vétérinaire d'Alfort, 2023. http://www.theses.fr/2023ENVA0004.

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Les méthodologies actuelles de caractérisation d'Escherichia coli producteur de toxine Shiga (STEC) nécessitent l'isolement de la souche, ce qui est compliqué par le fait qu'il n'existe pas de milieu d'isolement spécifique qui distingue clairement les STEC des E. coli commensaux non pathogènes. Par conséquent, obtenir des informations sur les souches en utilisant une approche métagénomique éviterait d'isoler les souches pour les caractériser complètement. Dans le cadre du projet, en collaboration avec le BfR en Allemagne, nous évaluerons si de nouvelles approches de métagénomique à lecture lon

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39

Wetzel, Amy Noel. "Studies in Shiga toxin-producing Escherichia coli O157:H7 determination of factors contributing to the dissemination of Escherichia coli O157:H7 among dairy farms /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133239436.

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40

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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41

Holder, Vaughn B. "THE EFFECTS OF SLOW RELEASE UREA ON NITROGEN METABOLISM IN CATTLE." UKnowledge, 2012. http://uknowledge.uky.edu/animalsci_etds/6.

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The objective of this research was to investigate the effects of slow release urea on N metabolism in cattle. The ruminal behavior of Optigen®II and the effect of basal diet on the in situ degradability of urea and Optigen®II were evaluated. The effect of slow release urea and its interaction with degradable intake protein (DIP) level in the diet on N retention and excretion was evaluated utilizing 8 Holstein steers in a 4 x 4 Latin square experiment. In addition, the effect of slow release urea and DIP level on ruminal and systemic urea kinetics was evaluated using stable isotope techniques w

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42

Vasconcelos, Bruno Garcia. "Desenvolvimento de mix de açaí probiótico, prebiótico e simbiótico." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/9/9133/tde-13042010-093047/.

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Diversos estudos têm mostrado que alimentos adicionados de probióticos e prebióticos, em quantidades suficientes, trazem benefícios à saúde humana. Estes benefícios se devem, fundamentalmente, ao seu efeito na manutenção da microbiota intestinal benéfica. Paralelamente, ocorre aumento do consumo de derivados do açaí em grandes centros urbanos no Brasil e até mesmo no exterior, principalmente a sua polpa e derivados, que se deve, principalmente, ao alto valor calórico da fruta e à presença de pigmentos antioxidantes. O presente trabalho teve como principal objetivo desenvolver um mix de açaí qu

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43

Sanad, Yasser M. "Molecular Epidemiological and Pathogenesis Studies on Campylobacter Species in Cattle and Sheep." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322032603.

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Lisita, Milena Olivieri. "Evolução da população bacteriana na linha de produção do queijo minas frescal em uma indústria de laticínios." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-09092005-142314/.

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A evolução da população de microrganismos mesófilos aeróbios, coliformes totais e fecais e Staphylococcus coagulase positiva foi estudada na linha de processamento do queijo Minas frescal em uma indústria de laticínios sujeita à fiscalização do Serviço de Inspeção Federal (S.I.F.). Três pontos do processamento foram avaliados individualmente: a pasteurização com amostras de leite cru e leite pasteurizado, a coagulação com amostras de leite pasteurizado, de coalhada cortada e de coalhada dessorada e a salga com amostras de queijos antes e depois da salga e da salmoura. A contagem de microrgani

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45

Moloto, Phuti Gladys. "Identification of the dominant bacteria associated with the spoilage of UHT full cream milk." Thesis, Vaal University of Technology, 2016. http://hdl.handle.net/10352/457.

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M. Tech. (Biotechnology, Department of Biosciences, Faculty of Applied and Computer Sciences), Vaal University of Technology.<br>The Organization for Economic Co-operation and Development (OECD) and the Food and Agriculture Organization (FAO) of the United Nations predict that milk production and the dairy sector will remain one of the fastest-growing agricultural subsectors over the coming decade. The global milk production is projected to expand over the 2011-2020 period at an annual rate of 2%. In South Africa alone, approximately 14 – 15 million litres of milk are wasted annually due to mi

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46

DELLA, SCALA GIULIA. "STREPTOCOCCUS THERMOPHILUS UREASE ACTIVITY: PHYSIOLOGICAL ROLE AND TECHNOLOGICAL RELEVANCE IN DAIRY AND NON-DAIRY APPLICATIONS." Doctoral thesis, Università degli Studi di Milano, 2018. http://hdl.handle.net/2434/604396.

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The aim of this Ph.D. work was to investigate the physiological role and the technological relevance of the urease activity of the dairy bacterium Streptococcus thermophilus. It has been achieved a deeper comprehension of this peculiar enzymatic activity following different approaches. A milk-based medium that allows the discrimination between urease-positive S. thermophilus strains and urease-negative ones based on the colonies morphology had been developed; it was used as screening method looking for urease-defective mutants after UV mutagenesis of urease-positive strains of industrial inter

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47

Dias, Juliana. "Characterizing the gastrointestinal tract microbiota of dairy calves." Universidade Federal de Viçosa, 2017. http://www.locus.ufv.br/handle/123456789/13065.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-11-14T12:59:59Z No. of bitstreams: 1 texto completo.pdf: 3045284 bytes, checksum: 75fae3d40e3e0a912a8276323170df28 (MD5)<br>Made available in DSpace on 2017-11-14T12:59:59Z (GMT). No. of bitstreams: 1 texto completo.pdf: 3045284 bytes, checksum: 75fae3d40e3e0a912a8276323170df28 (MD5) Previous issue date: 2017-02-22<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Ao nascimento, os bezerros exibem um trato gastrointestinal subdesenvolvido (TGI) cuja maturação é estritamente relacionada à colonização da mi

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CARFORA, VIRGINIA. "Staphylococcus aureus and methicillin resistant staphylococcus aureus (mrsa) in dairy farms of central italy: a characterization of isolates from milk and dairy products and an in-farm epidemiological investigation on mrsa colonization of sheep and in-contact humans." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2015. http://hdl.handle.net/2108/203186.

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Staphylococcus aureus (S. aureus) is considered one of the most significant aetiological agent of intramammary infection in dairy ruminants, causing both clinical and subclinical forms accompanied with relevant economic losses due to reduced milk production and quality. S. aureus is also considered a major human foodborne pathogen. Milk and dairy products represent indeed potential sources of contamination by S. aureus preformed enterotoxins, which can be responsible of staphylococcal food-poisoning (SFP) outbreaks. S. aureus pathogenicity is also related to its capacity to quickly develop res

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Silvetti, T. "DEVELOPMENT OF INNOVATIVE TECHNIQUES FOR STUDYING MICROBIAL POPULATIONSIN MILK AND DAIRY PRODUCTS." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150173.

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ABSTRACT Within the complex bacterial community of traditional raw milk cheeses, lactic acid bacteria (LAB), naturally present in the milk as adventitious contaminants, play the key role in the cheese manufacture and ripening process through their acidifying, proteolytic and flavouring activities. Moreover, LAB contribute considerably to the microbial safety, since they produce organic acids and bacteriocins that extend shelf-lives of raw milk products. Numerous LAB genera and species such as Lactobacillus, Lactococcus, Streptococcus, Leuconostoc and Enterococcus are involved in these metab

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50

Colombo, Monique. "Beneficial properties and safety of lactic acid bacteria isolated from the dairy production environment." Universidade Federal de Viçosa, 2017. http://www.locus.ufv.br/handle/123456789/11610.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-08-24T13:21:13Z No. of bitstreams: 1 texto completo.pdf: 1177730 bytes, checksum: ae33210f9ef99d122bd42327540bae5c (MD5)<br>Made available in DSpace on 2017-08-24T13:21:13Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1177730 bytes, checksum: ae33210f9ef99d122bd42327540bae5c (MD5) Previous issue date: 2017-06-30<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Bactérias ácido lácticas (BAL) foram isoladas do ambiente de produção de leite e avaliadas quanto ao potencial benéfico. Testes preliminares e

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