Dissertations / Theses on the topic 'Livestock economics'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Livestock economics.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Bennett, Richard. "The economics of livestock disease control." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316155.
Full textIjpelaar, Adrianus C. E. "The Economics of Livestock Diseases: Applications for Policy Guidance." Thesis, University of Reading, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485355.
Full textCox, Mark. "Ecological economics of wildlife disease control." Thesis, University of York, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310898.
Full textBristley, J. H. "Animal economics : livestock, pastoralism and capitalism in post-socialist Mongolia." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1566678/.
Full textPaljor, Sonam. "Livestock economics and its impact on the environment of North Sikkim." Thesis, University of North Bengal, 1995. http://hdl.handle.net/123456789/1090.
Full textSancewich, Brian Robert. "Agricultural marketing and risk management strategies: an analysis of the United States livestock industry." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17158.
Full textDepartment of Agricultural Economics
Tian Xia
This dissertation examines several different issues regarding pricing and contracting decisions as well as risk management practices affecting the Unites States livestock industry. The resulting policy and market implications are applicable to industry stakeholders in the beef cattle industry. Each topic is presented in the following chapters. Chapter 1 uses time series techniques to identify movements in regional fed cattle prices under a mandatory price reporting system. Mandatory price reporting altered the structure of livestock markets by requiring supply and demand conditions to be reported twice daily thereby affecting the price discovery process. Results suggest the level of information flow and the transparency of prices increased, markets respond to new information quicker, and larger volume markets behave as a price leader to smaller markets with less volume. Chapter 2 uses closeout data to measure the variability of profits in fed cattle production. A mean-variance approach was used to model yield risk factors relevant to and known at the time cattle are placed on feed. Results indicate yield factors were influenced by several preconditioning variables such as gender, placement weight, feedlot location, placement season, and overall animal health and vitality. Estimates from the yield equations were then used to simulate the overall ex-ante distribution of expected profits for the cattle feeder and the results provide information regarding the effect of production risk and price risk on cattle feeding profits.
Rushton, Jonathan. "Quantitative methods for the economic assessment of smallholder crop-livestock farming systems." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336682.
Full textWorley, Charles Thomas. "Implications of liberalized U.S.-Canada trade on regional production and consumption of grain and livestock /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487677267730767.
Full textRojas-Olavarria, Hernan. "The development of local livestock services for the family agriculture sector in Chile." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264413.
Full textBoonsaeng, Tullaya. "Three Essays on the Demand of Imported and Domestic Meat and Livestock in the United States." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-08142006-103939/.
Full textNorthen, James R. "Farm assurance schemes in the United Kingdom livestock sector : their use as quality signals." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342092.
Full textN'Guessan, Yapo Genevier. "Economic impact of ethanol production on U.S. livestock sector : a spatial analysis of corn and distillers grain shipment." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/397.
Full textSheikh, Dekha. "Methodologies to assess income, consumption, and the impacts of livestock on household food security." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9988698.
Full textTincher, Louise Horowitz. "Taking Stock: The Import of European Livestock into Virginia and its Impact on Colonial Life." W&M ScholarWorks, 1987. https://scholarworks.wm.edu/etd/1539625411.
Full textScoones, Ian. "Livestock populations and the household economy : a case study from southern Zimbabwe /." Online version, 1990. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.281919.
Full textLopez, Alfredo Benito. "Livestock Production Costs of Small Ranches on the Central Altiplano." BYU ScholarsArchive, 2001. https://scholarsarchive.byu.edu/etd/5387.
Full textGramig, Benjamin M. "Essays on the economics of livestock disease management on-farm biosecurity adoption, asymmetric information in policy design, and decentralized bioeconomic dynamics /." Diss., Connect to online resource - MSU authorized users, 2008.
Find full textWadsworth, Jonathan. "A systems approach to agricultural extension in economic development as exemplified by an experiment with livestock farmers in Costa Rica." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254516.
Full textCohen, Will E. "Economic Strategies for White-Tailed Deer and Livestock Production on Central and South Texas Ranches." DigitalCommons@USU, 1991. https://digitalcommons.usu.edu/etd/5043.
Full textRiofrío, Ordóñez Carlos Andrés. "Economics of introducing forage and livestock into alternative crop rotation systems during the transition to organic agriculture." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98779.
Full textThe results from the statistical analysis suggest that crop enterprise net returns tended to be higher in forage-based rotations and in the livestock systems compared to cash crop rotations and the stockless system. Results from the LP model suggest that including forages and beef cattle during the transition to organic agriculture can provide considerable economic benefits, especially when crops were grown under ruminant compost.
Dlamini, Thula Sizwe. "The economics of converting a sheep farm into a springbuck (Antidorcas marsupialis) ranch in Graaff-Reinet: a simulation analysis." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1002738.
Full textBayoh, Isaac M. "Accounting for Endogeneity and Spatially Correlated Errors in Hedonic Analyses with an Application to the Effects of Livestock Operations on Residential Property Values." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275370128.
Full textLance, Nathan J. "Application of Electrified Fladry to Decrease Risk of Livestock Depredations by Wolves (Canis lupus)." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/282.
Full textNuñez, Lopez Raul Rolando. "Study of livestock production levels in three communities near the city of Riobamba." BYU ScholarsArchive, 1997. https://scholarsarchive.byu.edu/etd/5409.
Full textBolte, Kati Jo. "Electronic animal identification systems at livestock auction markets : perceptions, costs, and benefits." Thesis, Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/464.
Full textZimmerman, Lance C. "Factors influencing the price of value-added calves at Superior Livestock Auction." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/6991.
Full textDepartment of Agricultural Economics
Ted C. Schroeder
Value-added management at the cow-calf level is integrated across breeding, health and nutrition programs. Hedonic pricing models are necessary to navigate through the layered management standards imposed by certified health and marketing programs on the cow-calf sector. Previous research in feeder calf pricing models provides insight on the use and development of ordinary least squares in estimating price effects. Breed, vaccination program, age-and-source verification and natural-beef production have become more relevant as vertical coordination has influenced commercial cow-calf producers. This study provides the industry with new information pertaining to the revenue opportunities that exist for cow-calf producers through increased coordination in the beef industry. Video and satellite auction markets are recognized as a national pricing mechanism for feeder cattle in the United States. These markets represent the management and marketing practices of national cow-calf producers and the tastes and preferences of a national stocker and feedlot industry. Previous research in feeder cattle pricing models is applied to the current genetic, management, marketing and market structure information from video auction markets to discover relevant price effects pertaining to value-added calf production. More intensive value-added management practices were expected to enhance the revenue of cow-calf producers selling their calves through video auction markets. This research confirms that verified health and genetic claims produce higher calf prices compared to commodity calves. Weaned calves with at least two rounds of respiratory vaccinations generated an additional $5.50 to $7.50 per cwt., and weaning created $2.75 to $4.50 per cwt. in premiums over non-certified health programs. There were statistical differences among the premiums for each aggregated breed influence, and Angus and black and black-white faced cattle offered the highest breed premiums at $5.25 to $7.50 per cwt. compared to Brahman-influenced calves. Age-and-source verification presents the best opportunity for video auction market premiums among recently developed marketing programs. Statistically significant premiums ranged from $1.25 to $2.00 per cwt. for both steers and heifers over the last five years.
Allison, John T. Jr. "TWO ESSAYS ON INPUT SUBSTITUTION AND OPTIMAL DECISION MAKING IN CROP AND LIVESTOCK PRODUCTION SYSTEMS." UKnowledge, 2019. https://uknowledge.uky.edu/agecon_etds/80.
Full textNordin, Camilla. "Investigation of the livestock prices in Sweden and the effect of the membership of the European Union." Thesis, Mittuniversitetet, Institutionen för ekonomi, geografi, juridik och turism, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-41200.
Full textIbrahim, Medhat. "Analysis of Portfolio Diversification and Risk Management of Livestock Assets in the Borana Pastoral System of Southern Ethiopia." DigitalCommons@USU, 2015. https://digitalcommons.usu.edu/etd/4408.
Full textMontalvo, Silva Egresado Ángel. "Diagnosis of livestock production in three communities (Tunshi San Javier, San Antonio and Maria Auxiliadora) using the Chambo irrigation system - Guano." BYU ScholarsArchive, 1997. https://scholarsarchive.byu.edu/etd/5403.
Full textGodana, Wario. "Sero-epidemiology and economics of contagious bovine pleuropneumonia in the beef cattle fattening and marketing chain of the livestock development and marketing enterprise from southern Ethopia." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431029.
Full textWray, Vicki Lorraine. "Cattle price risk management strategies-using computer simulation to educate Iowa producers of available tools." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/759.
Full textSieff, Daniela F. "The effects of resource availability on the subsistence strategies of Datoga pastoralists of north west Tanzania." Thesis, University of Oxford, 1995. http://ora.ox.ac.uk/objects/uuid:a499a1dd-3c21-4be9-8572-261a9625b85d.
Full textSilva, Cínthia Simões da. "Instituições na pecuária de corte e sua influência sobre o avanço da sojicultura na campanha gaúcha." Universidade Federal do Pampa, 2018. http://dspace.unipampa.edu.br:8080/jspui/handle/riu/2969.
Full textMade available in DSpace on 2018-05-23T15:57:13Z (GMT). No. of bitstreams: 1 Cínthia Simões da Silva - 2018.pdf: 1372146 bytes, checksum: 384414ab25bf737da9481d6a1967b821 (MD5) Previous issue date: 2018-03-26
A produção pecuária é caracterizada historicamente como principal atividade econômica do Pampa Gaúcho. No entanto, nas últimas décadas com a introdução de novos sistemas de cultivos agrícolas e a diversificação das atividades produtivas nas organizações rurais, áreas tradicionalmente destinadas à produção pecuária deram espaço as lavouras, evidenciando o crescimento das áreas plantadas com grãos, principalmente de soja na metade sul do Rio Grande do Sul. A transformação do cenário produtivo da pecuária, portanto, expõe uma rica realidade empírica para uma análise a partir da Economia Institucional. Assim, o objetivo da dissertação foi analisar as instituições da pecuária de corte e sua influência no avanço da soja na Campanha Gaúcha. A proposta metodológica da dissertação baseou-se na utilização de dados primários. Para a identificação do perfil e das instituições presentes na pecuária da Campanha Gaúcha, aplicou-se um questionário semiestruturado em uma amostra de 95 pecuaristas, sendo destes 53 Pecuaristas Tradicionais e 42 Pecuaristas Sojicultores, entre junho e novembro de 2017. A análise dos dados seguiu técnicas de estatística descritiva, análise fatorial, teste de hipóteses e regressão linear múltipla. Evidenciaram-se algumas similaridades no perfil socioeconômico e produtivo dos pecuaristas amostrados. Os dados primários indicaram que a atividade pecuária é desenvolvida em variadas estruturas fundiárias. O rebanho bovino nas organizações rurais apresenta tamanho diverso e, ainda que ocorra o cultivo de lavouras de soja nas organizações dos Pecuaristas Sojicultores, a atividade pecuária permanece uma importante exploração econômica. Constatou-se que as instituições presentes na nova dinâmica da pecuária da Região da Campanha apresentam conexão com o passado, a cultura e a tradição da atividade. O resultado da análise fatorial exploratória realizada identificou a presença de quatro fatores: as Instituições Comportamentais, Instituições Socioambientais, Instituições Econômicas, e Instituições Organizacionais. Os resultados dos testes de hipóteses identificaram diferenças entre as instituições presentes nas decisões dos Pecuaristas Tradicionais, estas ligadas a instituições comportamentais e socioambientais e ao processo de path dependence, e dos Pecuaristas Sojicultores que apresentaram maiores médias em variáveis de Instituições Econômicas e Organizacionais. Os resultados da regressão linear indicaram influência positiva das instituições econômicas no avanço do cultivo de soja nas organizações. No que diz respeito às instituições comportamentais e socioambientais, o modelo de regressão identificou que quando maior a presença destas instituições no comportamento dos pecuaristas menor é a presença do cultivo de soja nas organizações rurais. Conclui-se que compreender a nova dinâmica estabelecida na pecuária de corte da Campanha Gaúcha significa reconhecer o indivíduo como determinante da escolha de suas atividades produtivas, influenciado pelas suas motivações, hábitos de pensamento e ações coletivas. Reforçando a importância da utilização da abordagem Institucional, assim como das instituições (formais e informais), não apenas como componentes de análise, mas como agente principal nas transformações ocorridas nas organizações e no meio rural.
Livestock production is historically characterized as the main economic activity of the Pampa Gaucho. However, in the last decades with the introduction of new farming systems and the diversification of productive activities in rural organizations, areas traditionally destined to livestock production have given way to crops, evidencing the growth of areas planted with grains, mainly soybeans in half south of Rio Grande do Sul. The transformation of the livestock production scenario, therefore, exposes a rich empirical reality for an analysis based on the Institutional Economy. Thus, the objective of the dissertation was to analyze the institutions of the cattle ranching and its influence on the soybean advance in the Campanha Gaúcha. The methodological proposal of the dissertation was based on the use of primary data. A semi-structured questionnaire was applied to a sample of 95 ranchers, of which 53 Traditional Cattle Raisers and 42 Pecuaristas Sojicultores, between June and November of 2017, were used to identify the profile and the institutions present in the Campanha Gaúcha. Data analysis followed techniques of descriptive statistics, factorial analysis, hypothesis testing and multiple linear regression. Some similarities were observed in the socioeconomic and productive profile of the farmers sampled. The primary data indicated that livestock farming is carried out in a variety of land structures. The cattle herd in the rural organizations presents a diverse size and, although the cultivation of soybean plantations occurs in the organizations of the Soybeans Farmers, the livestock activity remains an important economic exploitation. It was verified that the institutions present in the new dynamics of the livestock of the Region of the Campaign present connection with the past, the culture and the tradition of the activity. The results of the exploratory factorial analysis identified the presence of four factors: Behavioral Institutions, Socioenvironmental Institutions, Economic Institutions, and Organizational Institutions. The results of the hypothesis tests identified differences between the institutions present in the decisions of the Traditional Farmers, these linked to behavioral and socioenvironmental institutions and to the process of path dependence, and the Soybeans Farmers that presented higher averages in variables of Economic and Organizational Institutions. The results of the linear regression indicated a positive influence of the economic institutions in the advance of soybean cultivation in the organizations. Regarding behavioral and socioenvironmental institutions, the regression model identified that the higher the presence of these institutions in the behavior of small farmers is the presence of soybean cultivation in rural organizations. It is concluded that to understand the new dynamics established in the cattle ranching of the Campanha Gaúcha means to recognize the individual as determinant of the choice of his productive activities, influenced by his motivations, habits of thought and collective actions. Reinforcing the importance of using the institutional approach, as well as institutions (formal and informal), not only as components of analysis, but as the main agent in the transformations that occur in organizations and rural areas.
Silva, Emerson de Sousa. "O movimento pecuário nordestino." Universidade Federal de Sergipe, 2011. https://ri.ufs.br/handle/riufs/4532.
Full textValendo-se dos dados disponibilizados pelo Censo Agropecuário 2006, a presente dissertação objetiva identificar dentre as cento e oitenta e oito microrregiões do Nordeste brasileiro aquelas em que o volume de movimentação pecuária (representada pelo quantitativo de compra, venda e abate de caprinos, ovinos, bovinos, suínos e galináceos nas propriedades rurais) permitiria uma alta freqüência de comercialização de animais entre os segmentos de produção e transformação o que resultaria em estruturas de governança de mercado. O trabalho assentou-se sobre dois pilares teóricos: a economia dos custos de transação (ECT), de Oliver Williamson, e a Commodity System Approach (CSA), elaborada por John Davis e Ray Goldberg. A primeira teoria defende que, em função da racionalidade limitada dos agentes e da tendência desses em assumirem um comportamento oportunista, é impossível aos agentes anteverem plena e racionalmente os resultados de suas decisões e que esses se protegem de possíveis falhas na execução das transações econômicas a partir da constituição de contratos entre as partes envolvidas. Já a CSA advoga que o processo produtivo da agropecuária não pode ser abordado de forma estanque, ou seja, sem a compreensão do seu caráter sistêmico, que vai desde a decisão do que e como produzir até o consumidor final. O ferramental utilizado foi a Análise Fatorial Exploratória, técnica estatística multivariada que permite a identificação de fatores latentes que explicariam o inter-relacionamento entre as variáveis sob estudo. Os resultados mostraram que a movimentação pecuária nordestina é um evento concentrado e especializado no sentido de que grande parte dá-se em poucas microrregiões e raramente uma localidade se destaca em mais de uma cultura. Logo, a coordenação de mercado para a interface produção/processamento de produtos agrícolas é indicada para um pequeno número de microrregiões nordestinas.
Thuranira, Christine M. "Socio-economic factors influencing livestock keeping dynamics in a smallholder crop-livestock system in western Kenya." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/30029.
Full textKobayashi, Mimako. "Livestock production in transition economies : the case of Kazakhstan /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Full textLieber, Matteo Johann <1997>. "Industrial livestock farming in China: economic, environmental, and ethical implications." Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/19881.
Full textBowen, Judith K. "An economic evaluation of a livestock production project of Bali, Indonesia." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29772.
Full textLand and Food Systems, Faculty of
Graduate
Nhemachena, Charles. "Agriculture and future climate dynamics in Africa impacts and adaptation options /." Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-05302009-122839/.
Full textKulak, Konrad K. "Comparison of economic values for livestock trait improvement with and without risk." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0017/NQ47394.pdf.
Full textBrummitt, William E. "China's economic growth, agricultural self sufficiency and its livestock and grain sectors /." Title page, contents and introduction only, 1989. http://web4.library.adelaide.edu.au/theses/09EC/09ecb893.pdf.
Full textOliveira, Adriana Santos de. "Livestock, agriculture, trade: dynamics of economic relations of Sobral village (1773-1799)." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15905.
Full textCreated in 1773 in order to accommodate vagrants and vagabonds who had nowhere to live and work, Sobral village developed an economy based on livestock, agriculture and trade. The interconnection of these activities enabled the development of a mixed economy, which created economic networks between ranchers, farmers and traders, thus forming heterogeneous elite. This was related to a mass of poor and free men who worked the cattle ranches, the farms and small businesses. We believe that these trade relations approached the elite and the poor men, which enabled the recent training in specialized activities, as well as the local business area. This enabled these men would create social strategies, enabling them to act freely in the economy, a profit with their work and generating prospects to be part of Sobral's elite. In our research, we analyzed the working relationships developed in Sobral Village to observe how they occur and how they influenced the personal trajectory of the residents. For this, we use the documents of the Board, which recorded economic activities, realizing the importance of each to the formation of Sobral's population.
Criada em 1773 com o objetivo de acomodar vadios e vagabundos que nÃo tinham onde morar e trabalhar, a Vila de Sobral desenvolveu uma economia baseada na pecuÃria, na agricultura e no comÃrcio, o que proporcionou o desenvolvimento de uma economia mista onde a interligaÃÃo dessas atividades criou redes econÃmicas que ligaram pecuaristas, agricultores e comerciantes, formando uma elite heterogÃnea que se relacionava com uma massa de homens pobres e livres que trabalhavam nas fazendas de gado, nas lavouras e no pequeno comÃrcio. Esse envolvimento nos levou a pensar a realidade dos homens livres e sem posses na Vila, onde as relaÃÃes criadas aproximaram elite e homens pobres, principalmente, nas relaÃÃes comerciais, permitindo aos Ãltimos a formaÃÃo em atividades especializadas e o domÃnio do comÃrcio local. Isso possibilitaria a esses homens criar estratÃgias sociais que lhes permitiam atuar livremente na economia, obtendo lucro com seu trabalho, gerando perspectivas de fazer parte da elite de Sobral. Tendo essas afirmativas como base, analisamos as relaÃÃes de trabalho desenvolvidas na Vila de Sobral para observar como elas ocorriam e como influenciaram na trajetÃria pessoal dos moradores. Para isso, utilizamos os documentos da cÃmara que registraram as atividades econÃmicas, percebendo a importÃncia de cada uma delas para a formaÃÃo da populaÃÃo de Sobral.
Silbert, Michele Sue 1960. "Mesquite pod utilization for livestock feed: An economic development alternative in central Mexico." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/291526.
Full textHeffernan, Claire. "The socio-economic impact of restocking destitute pastoralists : a case study from Kenya." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364466.
Full textGruber, Ina. "The impact of socio-economic development and climate change on livestock management in Benin." Frankfurt, M. Berlin Bern Bruxelles New York, NY Oxford Wien Lang, 2008. http://d-nb.info/994941676/04.
Full textPhiri, Phillip H. W. "The Economic Role of Range Livestock Production in Kasungu Agricultural Development Division (KADD), Malawi." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/6554.
Full textVanDyke, Laura Snively. "Nutrient Management Planning on Virginia Livestock Farms: Impacts and Opportunities for Improvement." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36659.
Full textMaster of Science
Beard, Rodney. "Ito stochastic control theory, stochastic differential games and the economic theory of mobile pastoralism /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18631.pdf.
Full textMostafa, Imeni Seyed. "Techno-Economic Assessment of Anaerobic co-digestions of livestock manure with agro-industrial by-products." Doctoral thesis, Universitat de Vic - Universitat Central de Catalunya, 2019. http://hdl.handle.net/10803/667824.
Full textDeposition of excess amount of livestock waste when they are not properly treated has a notable environmental impacts specially on soil and undergrounds water. Livestock waste as a biodegradable waste can be treated and recycle to finally obtain compost or biogas which means green energy and fertilizer/soil-amendment products. In general biodegradable waste receives especial attention in the European Legislation (Revised Framework Directive 2008/98/CE) and therefore, is necessary to develop suitable facilities to treat these types of waste and assure the correct and efficient operation of such treatment and management facilities. Anaerobic digestion of dairy cattle manure is a common practice; however, the low biogas yield of manure can hamper the profitability of anaerobic digestion systems in small to medium dairy cattle farms. To make this technology more attractive to farmers, an increase in biogas yield per cubic meter of reactor could be achieved by co-digesting animal manure with an abundant and easy accessible co-substrate such as agricultural by-products like wheat straw (in its raw form or pre-treated) and dairy industry by-products like cheese whey. In addition of increase in biogas production which can be translated to production of more energy, economic feasibility of implementation of anaerobic digestion plants in the farms is a must. However, there is scarce information provided in scientific literature about economic feasibility of implementation of such plants in small to medium cattle farms. Thus, in this thesis a techno-economic assessment of anaerobic co-digestion of animal manure and wheat straw (in the raw form and pretreated) or cheese whey was carried out. The technological assessment was carried out at lab scale using batch and semi-continuous reactors. With the data obtained, an economic model was developed in order to investigate the profitability of anaerobic co-digestion plants in small to medium dairy cattle farms, sensitivity analyses were carried out to investigate important parameters (e.g. electricity price) on the overall economic performance of the system. The results obtained from the techno-economic assessment showed that for a farm of 250 adult cattle heads the revenues generated in an anaerobic mono-digestion process are not able to offset the initial required investment. However, the co-digestion of manure with raw or briquetted straw showed positive economic performance and positive returns (Net Present values > 0, Internal Rate of Return > 9 % and a Return of the investment in 11 years) as well as the co-digestion of manure with 30% of cheese whey which showed positive returns (Net Present values > 0, Internal Rate of Return > 11% and a Return of the investment in 9 years). For farmers willing to implement anaerobic digestion, Electricity selling price, and the price of the straw are the key parameters to determine the profitability of the system. Moreover, pre-treatments to increase the straw biogas production have been assessed and evaluated from a technic and economic perspective. Alkali and microwave-alkali straw pre-treatments showed the best results with an increase in biogas production of 156 % and 92 % compared to raw straw.