Consulta: subjectFacets:"Linear programming"
Registros recuperados: 59
Data/hora: 12/06/2024 03:38:39

Valor económico del agua en el distrito de riego 044 Jilotepec
Provedor de dados: 32
Autores: Zetina Espinosa, Ana Mónica.
El desperdicio de agua en la agricultura es un problema que se agrava debido a la escasez, por lo tanto, es importante determinar el precio para optimizar su uso.  El objetivo de este estudio es optimizar el patrón de cultivos en el Distrito de Riego 044, Jilotepec, Estado de México, en el ciclo agrícola 2008-2009 y dar un valor económico del agua en posibles escenarios futuros, para lo cual se instrumentó un modelo de programación lineal, en el que se tomaron 37 actividades agrícolas cíclicas y perennes; se introdujeron 62 restricciones. Los resultados mostraron una diferencia de 2.2 millones de pesos entre la situación actual y el óptimo económico. Con un escenario de asignación óptima sin restricción de superficie, el maíz, principal cultivo de la...
Palavras-chave: Programación líneal; Óptimo económico; Escasez; Linear programming; Optimized; Shortage; Economía; Maestría.
Ano: 2010
URL: http://hdl.handle.net/10521/82

Valor económico del agua en el distrito de riego 044 Jilotepec
Provedor de dados: 32
Autores: Zetina Espinosa, Ana Mónica.
El desperdicio de agua en la agricultura es un problema que se agrava debido a la escasez, por lo tanto, es importante determinar el precio para optimizar su uso.  El objetivo de este estudio es optimizar el patrón de cultivos en el Distrito de Riego 044, Jilotepec, Estado de México, en el ciclo agrícola 2008-2009 y dar un valor económico del agua en posibles escenarios futuros, para lo cual se instrumentó un modelo de programación lineal, en el que se tomaron 37 actividades agrícolas cíclicas y perennes; se introdujeron 62 restricciones. Los resultados mostraron una diferencia de 2.2 millones de pesos entre la situación actual y el óptimo económico. Con un escenario de asignación óptima sin restricción de superficie, el maíz, principal cultivo de la...
Palavras-chave: Programación líneal; Óptimo económico; Escasez; Linear programming; Optimized; Shortage; Economía; Maestría.
Ano: 2010
URL: http://hdl.handle.net/10521/82

Producción de maíz (Zea mays L.) en el estado de Puebla: Un enfoque de equilibrio espacial para identificar las zonas productoras más competitivas.
Provedor de dados: 32
Autores: Flores Cruz, Luis Alberto.
La focalización de recursos por parte del Gobierno para apoyar la producción de maíz en aquellas zonas con alto potencial productivo requiere la identificación de las zonas más competitivas. Para  determinar las zonas productoras de maíz (Zea Mays L.) más competitivas en el Estado de Puebla se formuló y se obtuvo la solución de un modelo de equilibrio espacial e inter-temporal que considera la demanda, la oferta, la distribución de la producción e importaciones, y el abasto del consumo en cada zona consumidora. El modelo usó datos del año promedio 2008-2010 y se obtuvieron cuatro soluciones que corresponden al año base, y a reducciones graduales en la disponibilidad de maíz para consumo proveniente de una disminución en las importaciones estatales. Los...
Palavras-chave: Zea mays; Programación lineal; Oferta; Consumo; Linear programming; Supply; Consumption; Import; Economía; Maestría; Importación.
Ano: 2013
URL: http://hdl.handle.net/10521/1846

Análisis multiobjetivo de la distribución de agua en el sector agrícola de la Comarca Lagunera, México.
Provedor de dados: 32
Autores: Jesús Lozano, Luis.
El objetivo de este estudio fue determinar un patrón óptimo de cultivos en el sector agrícola de la Comarca Lagunera considerando de manera simultánea la maximización de la ganancia y la minimización del consumo de agua, dos criterios de optimización usualmente en conflicto. Se formularon dos modelos, uno de programación lineal para replicar el patrón actual de cultivos como base de referencia en el análisis comparativo, y un segundo modelo de programación compromiso que considera de manera simultánea los objetivos en conflicto. Los resultados indican que una estructura productiva más eficiente que la actual, debería considerar el aumento de la superficie de hortalizas ya que estos cultivos consumen sólo el 5% del recurso agua, pero aportan 21% del...
Palavras-chave: Productividad del agua; Programación lineal; Programación compromiso; Water productivity; Linear programming; Compromise programming; Maestría; Economía.
Ano: 2012
URL: http://hdl.handle.net/10521/691

Uma aplicação do software cientifico "SOC" em programação linear: implementação do método Simplex Revisado.
Provedor de dados: 14
Autores: NASCIMENTO, M. A. do; PACHECO, O. I. P.
Neste trabalho é apresentada uma implementação do método Simplez Revisado [1], para resolver problemas de programação linear (p.p.l.), utilizando os recursos disponíveis no SOC, software Científico desenvolvido pela EMBRAPA no ámbito do Projeto Fábrica de Software.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Software científico.; Análise Estatística; Programação Linear.; Computer software; Statistical analysis; Linear programming.
Ano: 1989
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/2315

Modelo bioeconômico para avaliação ex ante de investimentos em sistemas de produção de bovinos de corte a pasto no cerrado.
Provedor de dados: 14
Autores: VELOSO, R. F.; BARIONI, L. G.; MALAQUIAS, J. V.; GOMES, E. G.; MOREIRA, J. M. M. A. P.; SILVA, O. D. D. da; FERNANDES, F. B.
bitstream/item/75890/1/bolpd-298.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Bovino de corte; Modelo bioeconômico; Savanna; Bioeconomic model; Management; Livestock farms.; Cerrado; Pastagem; Programação Linear.; Beef cattle; Linear programming; Pastures.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/899852

Optimización en la industria pesquera
Provedor de dados: 20
Autores: Arrascada, J.M.
The convenience of applying quantitative methods in companies of the fishing sector is demonstrated in order to reach competitivity, based not only in the quality of processes and products but also on the incidence of those operations. The study is examined from the point of view of a private fishing company. The characteristics of the Argentine (SW Atlantic) fishing industry are also described.Original Abstract: Se pone de manifiesto la conveniencia de la aplicacion de los metodos cuantitativos en las empresas del sector pesquero para lograr competitividad basada no solo en la calidad de los procesos y productos sino tambien en la incidencia que tienen las operaciones en la misma. El enfoque que se presenta, es desde el punto de vista de una empresa...
Tipo: Theses and Dissertations
Palavras-chave: Economic models; Fishery economics; Fishery industry; Fishery organizations; Linear programming; Linear programming; Http://aims.fao.org/aos/agrovoc/c_28903.
Ano: 2004
URL: http://hdl.handle.net/1834/3881

Influence of interest rate and the wood price in forest regulation models
Provedor de dados: 190
Autores: Carvalho, Kaio Henrique Adame de; Silva, Marcio Lopes; Leite, Helio Garcia; Binoti, Daniel Henrique Breda.
Forest production regulation is complex due to the large number of variables in the process. Economic variables consistently influence the results of regulation models. Therefore this study aims to analyze the influence of interest rate and wood price in some forest regulation models. Linear programming model was used in a studying case using data from 10 forest stands and the software Regulation of Forest Production, which was also used to simulate management and planning scenarios. All stands were regulated independently of the method used. It was observed that as the wood price raises, the annual cutting area becomes bigger and the average logging age decreases. The average annual production presented no change regardless of interest rate, wood price or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linear programming; Forest management; Economic variables Manejo Florestal; Economia Florestal; Planejamento Florestal Programação linear; Manejo florestal; Variáveis econômicas.
Ano: 2015
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/554

VALUE OF FEED PEAS TO SWINE DIETS
Provedor de dados: 31
Autores: Wachenheim,   Cheryl J.; Mattson,   Jeremy W.
Traditionally, hog production has been concentrated in the Corn Belt region of the United States.  During the past decade, North Carolina has become an important hog production state and now ranks second only to Iowa.  More recently, expansion in the U.S. hog industry has been in other non-traditional hog production states in the west/west central regions of the United States.  In the current study, field peas are considered as a least-cost hog ration ingredient in three U.S. markets.  The results of a linear programming analysis suggest that peas can be an attractive alternative as a feed ingredient in hog diets.  Even at relatively high prices, peas can be part of the least-cost diet replacing feedstuffs such as corn, barley, and soybean meal.  Except at...
Tipo: Working or Discussion Paper
Palavras-chave: Feed peas; Swine diets; Least-cost rations; Linear programming; Livestock Production/Industries.
Ano: 2002
URL: http://purl.umn.edu/23578

Interaktive Programmierungsansätze für die Gestaltung von Agrar- und Umweltprogrammen
Provedor de dados: 31
Autores: Kirschke,   Dieter; Jechlitschka,   Kurt.
Planning agricultural and environmental programmes has become a complex task. In this paper we show how interactive programming can help to solve such complex policy decision-making problems. The basic linear programming model is implemented with Excel. We show, for a hypothetical agricultural and environmental programme, how the approach can be used in an interactive way between scientists and policy decision-makers. The approach allows to visually demonstrate and quickly assess the consequences of changing assumptions and framework conditions on the programme design. It could effectively improve the quality of policy decision-making support; it requires the actors’ willingness, of course, to engage in a real dialogue.
Tipo: Journal Article
Palavras-chave: Agricultural and environmental programmes; EU agricultural policy; Decision-making support; Linear programming; Policy support; Agricultural and Food Policy; Environmental Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/98361

Cost-Minimizing Food Budgets in Ghana
Provedor de dados: 31
Autores: Darko,   Francis Addeah; Allen,   Benjamin; Mazunda,   John; Rahimzai,   Rafiullah; Dobbins,   Craig L.
Replaced with revised version of paper on 01/14/2011.
Tipo: Journal Article
Palavras-chave: Developing countries; Nutrition; Minimum costs; Linear programming; Food Consumption/Nutrition/Food Safety.
Ano: 2010
URL: http://purl.umn.edu/96161

Profitability and Resource Allocation Among Cotton and Peanuts When Considering Planting and Harvest Timeliness
Provedor de dados: 31
Autores: Meeks,   Timothy A.; Flanders,   Archie; Shurley,   W. Donald; White,   Fred C.; Gunter,   Lewell F.
Harvest timeliness is a continual problem in rotation of cotton and peanuts.  Efficient allocation of land and labor resources during production of cotton and peanuts requires decisions be made on allocating resources throughout the growing season. Of particular concern is efficient allocation during planting and harvesting.  Through economic analysis and linear programming optimization, planting and harvesting timeliness issues are addressed and compared with prevailing practices.  Results for a representative farm indicate that cotton planting should increase during the early period of the planting season as compared with current practice, and most cotton should be harvested before peanut harvest begins.
Tipo: Journal Article
Palavras-chave: Cotton; Harvest timeliness; Linear programming; Optimization; Peanuts; Planting timeliness; Crop Production/Industries; Production Economics; Q12; Q18.
Ano: 2005
URL: http://purl.umn.edu/43736

A Comparison of Parametric Approximation Techniques to Continuous-Time Stochastic Dynamic Programming Problems
Provedor de dados: 31
Autores: Kompas,   Tom; Chu,   Long.
We compare three parametric techniques to approximate Hamilton-Jacobi-Bellman equations via unidimensional and multidimensional problems. The linear programming technique is very efficient for unidimensional problems and offers a balance of speed and accuracy for multidimensional problems. A comparable projection technique is shown to be slow, but has stable accuracy, whereas a perturbation technique has the least accuracy although its speed suffers least from the curse of dimensionality. The linear programming technique is also shown to be suitable for problems in resource management, including applications to biosecurity and marine reserve design.
Tipo: Journal Article
Palavras-chave: Stochastic dynamic programming; Parametric approximation; Perturbation; Projection; Linear programming; Optimal fishing; Marine reserves; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C61; C63; Q22.
Ano: 2010
URL: http://purl.umn.edu/95044

THE ECONOMIC POTENTIAL OF VEGETABLE PRODUCTION FOR LIMITED RESOURCE FARMERS IN SOUTH CENTRAL ALABAMA
Provedor de dados: 31
Autores: Gan,   Jianbang; Kebede,   Ellene.
The objective of this study was to evaluate the potential of vegetable production to enhance the declining farm income of limited resource farmers.  A survey of 60 limited resource farmers in south central Alabama was undertaken to carry out this evaluation.  Results of the survey show that 95% of the farmers had an annual farm income of less than $12,000.  Linear programming methodology was applied to perform a whole-farm analysis of a representative farm developed from the data.  The overall results show that vegetable production will significantly increase the annual income of these farmers.  Some specific conclusions are that: (a) the total return from vegetable production depends on vegetable mixes; (b) vegetable production is labor intensive and...
Tipo: Journal Article
Palavras-chave: Enterprise budget; Farm analysis; Farm income; Limited resource farmers; Linear programming; Minimum wage; Vegetable production; Production Economics.
Ano: 1999
URL: http://purl.umn.edu/14681

SALMOD, a Salinity Management Tool for Irrigated Agriculture
Provedor de dados: 31
Autores: Armour,   R.J.; Viljoen,   Machiel F.
This paper presents an irrigation farm management tool, SALMOD (Salinity And Leaching Model for Optimal irrigation Development), that calculates the profit maximizing crop enterprise composition and irrigation management options for farm specific soil type, drainage status and irrigation system composition subject to various regional control measures and expected irrigation water salinities. After stating the water quality problem, and particularly salinisation in Southern Africa, the input data requirements and the results of SALMOD and their usefulness at farm level, are discussed. The impact of various possible regional or policy regulations are then discussed. SALMOD was developed for irrigators in the lower Vaal and Riet Rivers in South Africa. These...
Tipo: Conference Paper or Presentation
Palavras-chave: Irrigation; Water quality; Return flows; Salinisation; Leaching; Non-point source pollution; On-farm storage; SALMOD; Linear programming; GAMS; Farm Management; Land Economics/Use.
Ano: 2002
URL: http://purl.umn.edu/7012

ALLOCATING LAND TO NEW YORK'S CONSERVATION RESERVE ENHANCEMENT PROGRAM TO MAXIMIZE NET ENVIRONMENTAL BENEFITS
Provedor de dados: 31
Autores: Jaroszewski,   Laura; Poe,   Gregory L.; Boisvert,   Richard N.
A programming model is used to assess the welfare effects of regional and practice specifications contained in New York State's Draft Conservation Reserve Enhancement Program (CREP) proposal.  Net social benefits are nearly 75% lower than options that explicitly account for opportunity costs of production, environmental benefits, and participation response functions. Keywords: benefit cost analysis, conservation programs, participation, linear programming
Tipo: Conference Paper or Presentation
Palavras-chave: Benefit cost analysis; Conservation programs; Participation; Linear programming; Environmental Economics and Policy; Land Economics/Use.
Ano: 2000
URL: http://purl.umn.edu/21882

Programming Regional Rural Development for Poland: A Research Perspective
Provedor de dados: 31
Autores: Ziolkowska,   Jadwiga.
Since Mai 2004 Poland is a new EU member country and has, due to the short membership period, little experience in creating rural policy according to the EU regulations. Additionally, there is a centralised planning of rural policies. The aim of the poster is to present how financing of rural policy can be improved by means of scientific programming methods. The study shows how the modelling approach can be used to analyse the optimal budget allocation for the Polish Plan for Development of Rural Areas from a regional perspective to better reach defined objectives.
Tipo: Conference Paper or Presentation
Palavras-chave: Rural development; Policy for rural areas; Linear programming; Poland; Community/Rural/Urban Development; Q10; Q18; C61; Z0.
Ano: 2005
URL: http://purl.umn.edu/24677

Modeling Greenhouse Gas Emissions on Diversified Farms: The Case of Dairy Sheep Farming in Greece
Provedor de dados: 31
Autores: Sintori,   Alexandra; Tsiboukas,   Kostas.
Agricultural activity has been identified as a considerable source of Greenhouse Gas (GHG) emissions. Emissions from ruminant livestock farms are produced particularly due to CH4 emissions from enteric fermentation. Dairy sheep farming is the most important livestock production activity in Greece, characterized by a high degree of farm diversification. This paper addresses the issue of the evaluation of GHG emissions of Greek dairy sheep farms, through the use of a whole farm mathematical programming model that uses farm level data and optimizes total gross margin. Mathematical programming models are an appropriate tool, when addressing complex issues, such as GHG emissions. The analysis is undertaken on different farm types, instead of a representative...
Tipo: Conference Paper or Presentation
Palavras-chave: Dairy sheep farming; Linear programming; GHG emissions; Abatement cost; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/91812

Payments for environmental services : incentives through carbon sequestration compensation for cocoa-based agroforestry systems in Central Sulawesi, Indonesia
Provedor de dados: 31
Autores: Seeberg-Elverfeldt,   Christina; Schwarze,   Stefan; Zeller,   Manfred.
Up to 25 percent of all anthropogenic greenhouse gas emissions are caused by deforestation, and Indonesia is the third largest greenhouse gas emitter worldwide due to land use change and deforestation. On the island of Sulawesi in the vicinity of the Lore Lindu National Park (LLNP), many smallholders contribute to conversion processes at the forest margin as a result of their agricultural practices. Specifically the area dedicated to cocoa plantations has increased from zero (1979) to nearly 18,000 hectares (2001). Some of these plots have been established inside the 220,000 hectares of the LLNP. An intensification process is observed with a consequent reduction of the shade tree density. This study assesses which impact carbon sequestration payments for...
Tipo: Working or Discussion Paper
Palavras-chave: Payments for environmental services; Carbon sequestration; Agroforestry systems; Cocoa; Linear programming; Economic incentives; Poverty; Environmental Economics and Policy; Land Economics/Use.
Ano: 2008
URL: http://purl.umn.edu/92827

PRICE-RESPONSIVENESS OF DEMAND FOR IRRIGATION WATER WITHDRAWALS VS. CONSUMPTIVE USE: ESTIMATES AND POLICY IMPLICATIONS
Provedor de dados: 31
Autores: Young,   Robert A.; Cardon,   Grant E.; Scheierling,   Susanne M.
Of water withdrawn for agricultural crop irrigation, a portion is consumed and the remainder comes back to the hydrologic system as return flows. Previous models of irrigation water demand have mostly focused on the change in withdrawals in response to price changes, even though knowledge of the response of consumptive use is often more significant for river basin planning. This study develops a simulation/mathematical programming model of water demand representing an irrigation company in northeastern Colorado to analyze the effect of hypothetical price increases on both the demand for withdrawals and a derived demand for consumptive use. The results demonstrate that consumptive use demand tends to be significantly less price-responsive than withdrawal...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop simulation; Irrigation; Linear programming; Water conservation; Water-demand elasticities; Water policy; Resource /Energy Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/35974

The potential impact of markets for irrigation water in Italy and Spain: a comparison of two study areas
Provedor de dados: 31
Autores: Pujol,   Joan; Raggi,   Meri; Viaggi,   Davide.
The viability of irrigated systems in Southern Europe is closely linked to efficient institutional settings and water-allocation mechanisms. A significant, although not widely used, mechanism for water allocation is an intra-sectorial water market. The objective of this paper is to evaluate to what extent water markets may contribute to the improvement of the efficiency of water allocation and to the profitability of irrigated agriculture. The related issues of water allocation among farm types and farm specialisation are also addressed. The analysis is based on a basin-level linear programming model, comparing the situation with and without a market. It includes both fixed and variable transaction costs and estimates their combined effects on market...
Tipo: Journal Article
Palavras-chave: Water trading; Natural resource management; Simulation; Water management and policy; Linear programming; Irrigation; Resource /Energy Economics and Policy.
Ano: 2006
URL: http://purl.umn.edu/116971

Integrating small farms in agent based models
Provedor de dados: 31
Autores: Roder,   Norbert; Kantelhardt,   Jochen.
In German agriculture structural change is mainly a result of the outmigration of smaller farms from the sector. The decisions of these farmers to leave or stay in the sector, are not based solely on financial data and market expectations. Other aspects are important such as the preservation of the cultural landscape, the continuation of the family tradition, or self-realisation. Only if these goals are adequately integrated into land use models, one can hope that the type and magnitude of reactions predicted by the model will be similar to that observed in reality. The main goal of this paper is to present a model approach that allows for the integration of non-monetary aspects into an agri-economic land use model. The approach is tested for a sample of...
Tipo: Conference Paper or Presentation
Palavras-chave: Farmer attitude; Linear programming; Agent based modelling; Land market; Agricultural and Food Policy; Consumer/Household Economics; Land Economics/Use; Q12; Q15; R14.
Ano: 2009
URL: http://purl.umn.edu/52826

Moderate versus Big Cows: Do Big Cows Carry Their Weight on the Ranch?
Provedor de dados: 31
Autores: Doye,   Damona G.; Lalman,   David L.
Efficiency in beef production and economics is impacted by cow maintenance requirements and output.   Budget and linear programming analysis are used to evaluate cost and returns for two cow sizes on two different pasture systems. Moderate-sized cows on native pasture generate the greatest pre-tax returns to management and overhead.
Tipo: Conference Paper or Presentation
Palavras-chave: Cow size; Beef production; Beef returns; Beef cost of production; Linear programming; Beef systems; Farm Management; Livestock Production/Industries; Production Economics; Q12.
Ano: 2011
URL: http://purl.umn.edu/98748

Entscheidungsunterstutzung bei der Gestaltung von Agrarumwelt-programmen: Ein Interaktiver, PC-Gestutzter Programmierungs-ansatz fur Sachsen-Anhalt
Provedor de dados: 31
Autores: Kirschke,   Dieter; Daenecke,   Ernst; Hager,   Astrid; Kastner,   Kerstin; Jechlitschka,   Kurt; Wegener,   Stefan.
The increasing importance of measures under the so called "second pillar" of the Common Agricultural Policy of the European Union raises new challenges to decision-makers. The definition and operationalisation of goals as well as the implementation of concrete measures is a complex task. Decisions have to be made on priorities for goals and measures and finally on the allocation of the budget. In this article we demonstrate how policy-making in complex systems can be supported by co-operation between scientists, policy-makers and administrators. Using a participatory computer-aided programming approach the case of improving the agri-environmental programme of Saxony-Anhalt is examined. Based on interactive simulations together with stakeholders and...
Tipo: Working or Discussion Paper
Palavras-chave: Agri-environmental policy; Agri-environmental programmes; Decision-making support; Linear programming; Policy consulting; Priority setting; Saxony-Anhalt; Environmental Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/18820

Incorporating Environmentally Compliant Manure Nutrient Disposal Costs into Least-Cost Livestock Ration Formulation
Provedor de dados: 31
Autores: Hadrich,   Joleen C.; Wolf,   Christopher A.; Black,   J. Roy; Harsh,   Stephen B.
Livestock rations are formulated to minimize feed cost subject to nutritional requirements for a target performance level, which ignores the potentially substantial cost of disposing of nutrients fed in excess of nutritional requirements. We incorporate nutrient disposal costs into a modified least-cost ration formulation model to arrive at a joint least-cost decision that minimizes the sum of feed and net nutrient disposal costs. The method is demonstrated with phosphorus disposal costs on a representative dairy farm. Herd size, land availability and proximity, crop rotation, and initial soil phosphorus content are shown to be important in determining phosphorus disposal costs.
Tipo: Journal Article
Palavras-chave: Environmental compliance; Linear programming; Livestock rations; Manure disposal; Agribusiness; Environmental Economics and Policy; Livestock Production/Industries; C61; Q12; Q52.
Ano: 2008
URL: http://purl.umn.edu/45525

IMPACTS OF WITHIN-FARM SOIL VARIABILITY ON NITROGEN POLLUTION CONTROL COSTS
Provedor de dados: 31
Autores: Vandyke,   Laura S.; Bosch,   Darrell J.; Pease,   James W.
The effects of considering variable within-farm soil runoff and leaching potential on costs of reducing nitrogen losses are analyzed for a Virginia dairy.  Manure applications may cause nitrogen losses through runoff and leaching because of factors such as uncertain nitrogen mineralization.  Farmers can reduce nitrogen control costs by applying manure on soils with less nitrogen loss potential.  Ignoring within-farm soil variability may result in overstating the farm's costs of reducing nitrogen losses.
Tipo: Journal Article
Palavras-chave: Economic costs; Linear programming; Manure; Nitrogen; Nutrient management; Simulation; Soil variability; Environmental Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/15139

Application of decision support methods in preparation for a Hungarian bio-fuel programme
Provedor de dados: 31
Autores: Lakner,   Zoltan; Vizvari,   Bela.
Under current market circumstances and those predictable in the near future, further increasing agricultural production seems to be rather groundless. By utilising agro-ecological conditions more efficiently, one eighth of Hungary’s gasoline demand could be satisfied from maize production, without considerably decreasing current agricultural production for human and animal consumption. For realisation of biofuel programmes a relatively stable socio-economic environment is essential. There is considerable pressure on government from different stakeholders to shift the risks of large-scale investments to the state budget. In the long-run, under the conditions of a liberalised world market the feasibility of biofuel-programmes based on European raw materials,...
Tipo: Journal Article
Palavras-chave: Agro-ecological potential; Land usage; Linear programming; Deterministic modelling; Multi-issue actor analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/48087

The Economics of Manure Utilization: Model and Application
Provedor de dados: 31
Autores: Keplinger,   Keith O.; Hauck,   Larry M.
A model of manure utilization is developed and applied to four types of transportable manure. Model results highlight important response differences among manure types and generally illustrate the diseconomies of manure production. For example, as manure production increases, manure value decreases and excess phosphate applications increase, thereby increasing the potential for phosphorus runoff. Policy scenarios limiting the manure application rate reduce manure value and excess phosphate application. Increasing the ratio of land using manure increases manure value while reducing excess phosphate application. Buildup of soil nutrients reduces manure value, but either increases or decreases excess phosphate application depending on the scenario.
Tipo: Journal Article
Palavras-chave: Linear programming; Manure application; Manure transportation; Manure utilization; Manure value; Optimization; Farm Management.
Ano: 2006
URL: http://purl.umn.edu/8611

Farm and catchment scale effects of managing dry-land salinity with pastoral and woody perennials
Provedor de dados: 31
Autores: Finlayson,   John D.; Bathgate,   Andrew D.; Hoque,   Ziaul; Nordblom,   Thomas L.; Theiveyanathan,   Tivi; Crosbie,   Russell; Mitchell,   David.
Dry land salinisation is a significant cause of land and water degradation in Australia. Changing land use from annual to perennial crops has been widely proposed as a means to reduce land degradation and increase the productivity of saline land. However, in many areas annual crops are financially more attractive than perennial crops. Increases in perennial crops might also reduce local stream flows with adverse effects on in-stream values. As such salinity control is likely to involve significant tradeoffs between public and private costs and benefits. This paper considers the impact of planting differing areas of pastoral and woody perennials on farm profitability (P), and water (W) and salt (S) exports from the Little River catchment in New South Wales...
Tipo: Conference Paper or Presentation
Palavras-chave: Bio-economic modelling; Linear programming; Farm systems; Catchments; Dryland salinity; Land Economics/Use.
Ano: 2007
URL: http://purl.umn.edu/10409

Modelling Farm Level Economic Potential for Conversion to Organic Farming
Provedor de dados: 31
Autores: Kerselaers,   Eva; Govaerts,   Wim; Lauwers,   Ludwig H.; De Cock,   Lieve; Van Huylenbroeck,   Guido.
A farm model is developed for simulating the potential income change resulting from conversion to organic farming. The model uses conventional farm data, taken from the Belgian FADN. Given the normative character of the model, and the impossibility of calibration to historical conversion behaviour, two model variants, a rigid and a flexible, are created to broaden the analysis scope. Moreover, extra attention is paid to the verification process and sensitivity analysis. Results reveal that the economic potential for conversion is rather high, if farmers are willing to change their farm management sufficiently. Furthermore, conversion potential depends on the farm type and conventional farm characteristics. The model finally proves to be an interesting tool...
Tipo: Conference Paper or Presentation
Palavras-chave: Organic farming; Conversion period; Farm model; Linear programming; Environmental Economics and Policy; Farm Management; C61; Q12.
Ano: 2005
URL: http://purl.umn.edu/24732

Mitigating the impact of El Nino-related drought on smallholder farmers in Central Sulawesi, Indonesia: An interdisciplinary modelling approach combining linear programming with stochastic simulation
Provedor de dados: 31
Autores: Keil,   Alwin; Teufel,   Nils; Gunawan,   Dodo; Leemhuis,   Constanze.
Crop production in the tropics is subject to considerable climate variability caused by the El Niño-Southern Oscillation (ENSO) phenomenon. In Southeast Asia, El Niño causes comparatively dry conditions leading to substantial declines of crop yields with severe consequences for the welfare of local farm households. Using a modelling approach that combines regression analysis with linear programming and stochastic simulation, and integrates climatic and hydrologic modelling results, the objective of this paper is to assess the impact of El Niño on agricultural incomes of smallholder farmers in Central Sulawesi, Indonesia, and to identify suitable crop management strategies to mitigate the income depressions. The results contribute to the formulation of...
Tipo: Conference Paper or Presentation
Palavras-chave: ENSO; Risk management; Linear programming; Stochastic simulation; Indonesia; Farm Management.
Ano: 2007
URL: http://purl.umn.edu/7942

DEMAND ESTIMATION FOR AGRICULTURAL PROCESSING CO-PRODUCTS
Provedor de dados: 31
Autores: Wachenheim,   Cheryl J.; Novak,   Patrick J.; DeVuyst,   Eric A.; Lambert,   David K.
Co-products of processing agricultural commodities are often marketed through private transaction rather than through public markets or those in which public transaction information is recorded or available.  The resulting lack of historical price information prohibits the use of positive time series techniques to estimate demand.  Demand estimates for co-products are of value to both livestock producers, who obtain them for use in livestock rations, and processors, who must sell or otherwise dispose of them.  Linear programming has long been used, first by researchers and later as a mainstream tool for nutritionists and producers, to formulate least-cost livestock rations.  Here it is used as a normative technique to estimate step function demand...
Tipo: Working or Discussion Paper
Palavras-chave: Co-products; Demand estimation; Econometrics; Linear programming; Agribusiness.
Ano: 2001
URL: http://purl.umn.edu/23488

The economic viability of biomass crops versus conventional agricultural systems and its potential impact on farm incomes in Ireland
Provedor de dados: 31
Autores: Clancy,   Daragh; Breen,   James P.; Butler,   Anne Marie; Thorne,   Fiona S.
Ireland is currently importing 90 percent of its energy. The burning of domestically produced nonrenewable peat provides 4.9 percent of Ireland’s total primary energy supply while renewable biomass crops currently account for only 1 percent of the domestically produced energy supply. The Irish government have set a target of 30% of peat (approximately 0.9 million tonnes) used for electricity generation to be replaced by renewable energy crops. This would be equivalent to approximately 0.6 million tonnes of biomass crops or approximately 45,000 hectares of biomass. Direct payments and subsidies accounted for over 100 percent of average family farm income on beef and sheep farms in 2006. Therefore there appears to be significant potential for Irish farmers...
Tipo: Conference Paper or Presentation
Palavras-chave: Willow; Miscanthus; Co-firing; Net present value; Probit; Linear programming; Agricultural Finance; Institutional and Behavioral Economics; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6485

THE COST OF MEETING EQUITY: OPPORTUNITY COST OF IRRIGATION IN THE FISH-SUNDAYS SCHEME OF SOUTH AFRICA
Provedor de dados: 31
Autores: Hoag,   Dana L.; Conradie,   Beatrice.
In this paper the incremental values of water are calculated for irrigators in the Fish-Sundays Scheme of South Africa's Eastern Cape province. The socio-political pressure for redistribution of agricultural resources provided the imperative for this study. The model of the Fish-Sundays Scheme reflects a survey of 50 000ha of fodder and citrus production. It explicitly models the water demand on sixteen typical farms, for five irrigation technologies, six crops and four livestock activities. The existing allocation generates an average value of R0.0423/m3/year, which increases to R0.0681/m3/year if farmer-to-farmer trading is allowed given existing infrastructure. Unrestricted trade raises the average value to R0.0719/m3/year. The marginal cost of...
Tipo: Conference Paper or Presentation
Palavras-chave: Water value; Irrigation; Linear programming; South Africa; Eastern Cape; Resource /Energy Economics and Policy; Q15; Q12.
Ano: 2003
URL: http://purl.umn.edu/25832

Modelling Waikato Farm Nitrogen Discharges for Policy Analysis
Provedor de dados: 31
Autores: Ramilan,   Thiagarajah; Scrimgeour,   Frank G.
This study describes the development of bio economic models examining the economic and water quality impact of various proposed policy options in the Upper Waikato catchment. In the first phase nitrogen emissions are determined for representative farming systems using the Overseer nutrient budget model. These model components are integrated into an economic model, which predicts producer responses to various policy options. The second phase determines catchment wide costs and water quality impacts of riparian buffers by combining geographic information system, bio economic modelling and experimental data. The results of the study signals directions for policy initiatives and further analysis exploring policy design and all costs associated with production...
Tipo: Conference Paper or Presentation
Palavras-chave: Riparian margins; Non point pollution; Nitrogen; Linear programming; And Environmental policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Health Economics and Policy; Industrial Organization; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98509

PRECIFICAÇÃO DA ÁGUA EM PROJETOS DE IRRIGAÇÃO: UMA APLICAÇÃO DO MÉTODO PARAMÉTRICO DE ESTIMAÇÃO DE UMA FUNÇÃO INSUMO-DISTÂNCIA
Provedor de dados: 31
Autores: Resende Filho,   Moises de Andrade; Araujo,   Felipe Augusto de; Barros,   Emanoel de Souza; Silva,   Alexandre Stamford Da.
O aumento da pressão sobre os recursos hídricos tem levado muitos países a reconsiderarem os mecanismos utilizados na indução do uso eficiente da água. Isso é especialmente verdade para a agricultura irrigada, uma das principais consumidoras de água. Estabelecer o preço correto da água é um dos mecanismos de tornar mais eficiente a alocação da água. Contudo, precificar a água ainda é uma tarefa polêmica. Assim, o presente estudo aplica o método paramétrico de estimação de uma função insumo-distância na obtenção do preço-sombra ou disposição da firma a pagar por uma unidade adicional de água. São utilizados dados sobre a produção, área irrigada, utilização de insumos diversos, mão-de-obra, capital e volume de água obtidos de 41 unidades produtivas...
Tipo: Conference Paper or Presentation
Palavras-chave: Disposição a pagar pela água; Precificação da água; Programação linear; Willingness to pay for water; Water pricing; Linear programming; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/112738

RENTABILIDADE E RISCO DE SISTEMAS ALTERNATIVOS DE PRODUÇÃO DE LEITE EM PEQUENAS PROPRIEDADES DA MICRORREGIÃO DE VIÇOSA, MG
Provedor de dados: 31
Autores: Oliveira,   Gabriel Leao; Vieira,   Wilson da Cruz.
The main objective of this work was to analyze the trade between income and risk related to the alternative milk production systems in the region of Viçosa, Minas Gerais, supported by the Federal University of Viçosa and Nestlé. A standard linear programming model provided the identification of the best options among the activities displayed for the maximization of the gross annual income. By means of the rentability calculation of the different milk production systems and risk linked to them it was possible to identify that the milk producers behaved differently in relation to the risk. Generally the producers who are more dependent to the milk activity for their survival are more adverse to risk.
Tipo: Journal Article
Palavras-chave: Risk; Linear programming; Milk production.
Ano: 2006
URL: http://purl.umn.edu/43811

Numerical Estimation of Agricultural Supply Functions - A Micro Economic Approach based on Mathematical Programming
Provedor de dados: 31
Autores: Rasmussen,   Svend; Damgaard,   Martin.
This paper describes a cost function approach to modelling production and resource use at the level of the individual farm firm. The procedure for deriving the supply function using mathematical programming under fairly general condition of a convex input set is shown, and the model is demonstrated. It is suggested that the model is used as the basic building block in agricultural sector models, the advantage being that the technology is modelled as a production frontier providing better opportunities for modelling input and output substitution.
Tipo: Conference Paper or Presentation
Palavras-chave: Cost function; Linear programming; Economies of scale; Agricultural sector models; Production frontier; Farm Management.
Ano: 2008
URL: http://purl.umn.edu/44181

What Price for the Right to Go a-Droving? A Derived Demand Approach
Provedor de dados: 31
Autores: Marshall,   Graham R.; Cacho,   Oscar J.; John,   Fatmata.
Travelling stock reserves (TSRs) were established in Australia as a way of allowing the passage of livestock through settled lands to facilitate stocking of new lands. Subsequently, they remained important as a way of moving livestock from property to property or from property to market. Today, the area of land dedicated to TSRs in NSW is estimated at 2.3 million hectares, which are used more as a source of feed than as a livestock thoroughfare. The value of TSRs as a source of feed is particularly important during drought periods, and pricing of access for walking stock has become a subject of contention within the Rural Land Protection Boards (RLPB). The price of TSR permits for walking stock is considerably lower than for agistment, thereby compromising...
Tipo: Working or Discussion Paper
Palavras-chave: Travelling stock reserves; Derived demand; Grazing; Linear programming; Demand and Price Analysis; Livestock Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/12917

Tradable Substitution Rights: Simulation of the Cost-Efficiency of a Nitrogen Reduction in the Pig Finishing Sector
Provedor de dados: 31
Autores: Carlier,   Peter Jan; Lauwers,   Ludwig H.; Mathijs,   Erik.
To comply with the European Nitrate Directive, the Flemish manure policy has been elaborated mainly on the base of command and control measures (maximum fertilisation limits etc.). In literature, however, tradable permits are described as a cost efficient and effective instrument. Applied to nutrient emission they might offer an alternative for the current, expensive manure policy. In this publication both policy instruments are compared by means of simulation models. Based on accountacy data from 190 pig finishing farms, it is shown that tradable rights may result in cost savings of over 88%, compared to the most cost efficient command and control model. This result indicates that tradable permits at least need to be considered as a plausible policy...
Tipo: Conference Paper or Presentation
Palavras-chave: Tradable permits; Agriculture; Command and control; Nitrogen; Linear programming; Livestock Production/Industries; C61; D23; H23; Q58; Q52.
Ano: 2005
URL: http://purl.umn.edu/24746

Improvement of the AROPAj model covering a large range of agricultural activities at wide (UE) and high resolution (mapping of farm types) scales
Provedor de dados: 31
Autores: Baranger,   Edouard; Clodic,   Melissa; Galko,   Elodie; Jayet,   Pierre-Alain; Zakharov,   Paul.
Mathematical programming models suit policy makers' needs for assessing impacts of new policies and modellers' needs for new parameters, constraints and activities to represent the phenomenon under study. The AROPAj model aims at taking into account any geographical extension of the European Union as well as the continuously changing Common Agricultural Policy. As well as the European policies will include more and more environmental problems, AROPAj will be more and more designed toward environmental assessments. Two improvement axes are set up. Biophysical models are used to refine the design of farming systems represented in the economic model and to estimate nitrogen pollutant emissions. Down-scaling methods are coupled with the regional farm group...
Tipo: Conference Paper or Presentation
Palavras-chave: Supply model; EU; Linear programming; Agriculture; Environment; Coupling; Down-scaling; Environmental Economics and Policy; Farm Management; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6664

Nutrition in Central Uganda - An Estimation of a Minimum Cost Healthy Diet
Provedor de dados: 31
Autores: Badirwang,   Keeletlhoko Faith; Nakakeeto,   Gertrude; Rudi,   Jeta; Taylor,   Daniel B.
This study makes use of linear programming methodology to design a minimum cost diet for the Central Ugandan region. We used a set of constraints on recommended levels of daily nutrient intake, recommended proportions of groups of foods, as well as preferences and food availability in Central Uganda, to design a minimum cost healthy daily diet. Several models were considered, each forcing at least one of the following frequently consumed staple foods: matooke, cassava, and rice. We found that the minimum costs of the optimal diets were lowest in the planting season of March and highest in the harvesting season of December.
Tipo: Conference Paper or Presentation
Palavras-chave: Central Uganda; Minimum cost diet; Malnutrition; Linear programming; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/103603

Searching for Productivity Gains through 'Once-a-Day' Milking on New Zealand's Pastoral Dairy Farms
Provedor de dados: 31
Autores: Guimaraes,   Frederico Borges; Woodford,   Keith.
Cows that are milked once-a-day (OAD) produce less milk than when milked twice-a-day (TAD). However, these cows also require less feed because of their lower milk production. Hence stocking rates can be increased. New Zealand evidence shows that the benefits from OAD milking can include per cow savings in animal health, labour and electricity costs, plus improved pregnancy rates. A linear programming model was used to evaluate the whole farm impact of these changes. This showed that OAD milking is likely to reduce profitability. This was based on recent New Zealand research showing an average per cow production decrease of 29% for Friesian cows and 20% for Jersey cows. However, given that some cows can perform under OAD at a similar level to TAD, it is...
Tipo: Conference Paper or Presentation
Palavras-chave: Once-a day milking; Milk harvesting; Linear programming; Pastoral dairy farming; Livestock Production/Industries.
Ano: 2005
URL: http://purl.umn.edu/24257

Financing Agri-Environmental Programs in Poland: The Importance of Regional Preferences
Provedor de dados: 31
Autores: Ziolkowska,   Jadwiga; Kirschke,   Dieter.
The main objective of the paper is to study the importance of regional preferences in financing agri-environmental programs. The analysis is based on results of a case study conducted in South-eastern Poland. As environmental protection in agriculture is complex and often considered in political strategies, it is worth analyzing the differences in perception of the respective environmental objectives from a regional perspective. Taking into account natural conditions and the economic situation in agriculture in the voivodship Podkarpackie, the question is, how regional objectives could be achieved effectively with a given budget. Using linear programming, we discuss in this paper, how regional preferences would guide budget allocation.
Tipo: Conference Paper or Presentation
Palavras-chave: Agri-environmental programs; Environmental objectives; Linear programming; Budget allocation; Poland; Environmental Economics and Policy; Q14; Q57; C6.
Ano: 2006
URL: http://purl.umn.edu/25658

Analysis and optimization regarding the activity of a Hungarian Pig Sales and Purchase Cooperation
Provedor de dados: 31
Autores: Balogh,   Peter; Ertsey,   Imre; Fenyves,   Veronika; Nagy,   Lajos.
In many ways, the Hungarian pork chain faces considerable disadvantages when compared to the situation in competing countries. In countries endowed with a modern meat chain, heavy concentration is the rule, but in Hungary decentralization still prevails, although thankfully the chain is not disintegrating even further. In our research we used the operation of co-operatives as a model in terms of a generalized network problem. The model allows the quantification of the number of pigs from given farms to slaughterhouses, the maximum sales revenue, the delivery threshold prices, and an analysis of the impact co-operative members exert on sales revenues.
Tipo: Journal Article
Palavras-chave: Pork production; Integration; Network; Linear programming; Demand and Price Analysis; Farm Management; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49192

Development of nature-oriented dairy farm systems with an optimization model: the case of ‘Farming for Nature’ in ‘de Langstraat’, the Netherlands
Provedor de dados: 31
Autores: Schrijver,   R.A.M.; Berentsen,   Paul B.M.; Groeneveld,   Rolf A.; Corporaal,   A.; de Koeijer,   T.J.
‘Farming for Nature’, a relatively new policy instrument being tried out in the Netherlands, is evaluated. The concept has been designed to allow dairy farmers to improve nature conservation on their farms. Under the scheme, no manure, fertilizer, or feed – concentrates or roughage - may be imported into farm systems from external sources. The feasibility of such a self-sustaining system and the conditions required for it to deliver the desired results, are explored with a farm-based linear programming model known as FIONA (Farm based Integrated Optimization Model for Nature and Agriculture). The model is explained and applied to ‘de Langstraat’, a region in southern Netherlands. The results show that levels of production under the ‘Farming for Nature’...
Tipo: Journal Article
Palavras-chave: Nature management; Dairy farming system; Linear programming; Farm-economics; Farm Management; Land Economics/Use.
Ano: 2006
URL: http://purl.umn.edu/97194

Linear Programming and Future Landuse Scenarios: An Irrigated Catchment Case Study
Provedor de dados: 31
Autores: Gyles,   Oliver; Montecillo,   Olive P.
Potential for change in the mix of irrigated enterprises was estimated for a catchment in the Shepparton irrigation region using linear programming. The model allocated resources to maximise net income in each of the next five decades as if the catchment were one farm. Change was driven by price trends and productivity and constrained by water resources, land capability and investment capital. On the basis of the assumptions implicit in the model and sensitivity testing carried out, it appears more likely that there will be a rapid decline in irrigated cropping and pasture based meat production in conjunction with a significant increase in irrigated dairying in the first two decades, followed by an interchange of resources between dairying and new...
Tipo: Presentation
Palavras-chave: Irrigation; Enterprise; Productivity; Change; Water allocation; Policy; Economic growth; Natural resource management; Linear programming; Shepparton Irrigation Region; Land Economics/Use.
Ano: 1999
URL: http://purl.umn.edu/123809

Impact of the CAP Reform on Small-Scaled Grassland Regions in Bavaria, Germany
Provedor de dados: 31
Autores: Roeder,   Norbert; Kantelhardt,   Jochen; Kapfer,   Martin.
The CAP reform of 2003 will change farmer's business environment in Europe. This paper analyses the impact of the reform on the land use in southern German grassland regions. The assessment will be based on model calculations for two typical grassland regions. Each study area represents one village with its specific farm structure and natural conditions. These regions differ in their excellence with respect to agricultural use. In Southern Germany small to medium sized family farms is the most frequent type of farming. We use a regional land-use model that conceives farms as independent agents aiming at maximum individual utility. Farm agents optimize their farm organisation with the help of a linear-programming algorithm that takes into account natural,...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP-reform; Linear programming; Land-market simulation; Agent-based modelling; Farmers attitude; Policy analysis; Agricultural and Food Policy.
Ano: 2006
URL: http://purl.umn.edu/25383

Food vs. Wood: Dynamic Choices for Kenyan Smallholders
Provedor de dados: 31
Autores: Peralta,   Maria Alexandra; Swinton,   Scott M.
Natural resource management
Tipo: Conference Paper or Presentation
Palavras-chave: Agroforestry; Eucalyptus; Food security; Kenya; Linear programming; Smallholder agriculture; Whole farm model; Crop Production/Industries; International Development; Production Economics; Resource /Energy Economics and Policy; O13; Q12.
Ano: 2009
URL: http://purl.umn.edu/49401

Impact of the CAP reform on small-scale grassland regions
Provedor de dados: 31
Autores: Roeder,   Norbert; Kantelhardt,   Jochen; Kapfer,   Martin.
This paper presents a regional land-use model that conceives farms as independent agents aiming at maximum individual utility. Farm agents optimize their utility with the help of a linear-programming algorithm that takes into account natural, economic and personal restrictions. Interactions between farms take place on the land market, which is modelled as an equilibrium market. The model is applied in three typical grassland regions in southern Bavaria. The results indicate that the CAP reform of 2003 has various significant consequences for grassland use. In particular, the decreasing profitability of dairy farming will lead to low-intensity forms of grassland use, including mulching. In general, land rents will increase due to the effects of decoupling.
Tipo: Journal Article
Palavras-chave: CAP Reform; Linear programming; Land-market simulation; Agent-based modelling; Farmers attitude; Policy analysis; Agricultural and Food Policy; Land Economics/Use.
Ano: 2006
URL: http://purl.umn.edu/97192

Farm-level Economic Evaluation of Net Feed Efficiency in Australia’s Southern Beef Cattle Production System: A Multi-period Linear Programming Approach
Provedor de dados: 31
Autores: Alford,   Andrew R.; Griffith,   Garry R.; Cacho,   Oscar J.
Selection of beef cattle for increased net feed efficiency is a current major focus for research. At present the trait seems to be more apparent in Australia’s southern beef production system which is dominated by mixed farming enterprises. Farm-level evaluation of net feed efficiency should take account of the farming system for which it is proposed along with the dynamic nature of genetic selection. Gross margin, linear programming and multi-period linear programming approaches to evaluation of the trait at the farm-level using a representative farm are compared. Implications of the trait for researchers and beef producers are identified
Tipo: Conference Paper or Presentation
Palavras-chave: Farm-level evaluation; Genetic traits; Linear programming; Farm Management.
Ano: 2003
URL: http://purl.umn.edu/57826

AVALIAÇÃO ECONÔMICA DE DIFERENTES ESTRATÉGIAS DE GANHO DE PESO DIÁRIO NA TERMINAÇÃO DE BOVINOS EM CONFINAMENTO
Provedor de dados: 31
Autores: Resende Filho,   Moises de Andrade.
Esse artigo avalia a viabilidade econômica da terminação de bovinos em confinamento para o ano de 2008. Dezessete cenários são simulados considerando-se diferentes ganhos de peso vivo diário para 220 animais, machos castrados, ½ Zebu  ½ Holandês, com peso inicial médio de 354 kg, confinados por 120 dias. Utiliza-se equações capazes de gerar os valores das exigências nutricionais dos animais para cada estratégia de ganho de peso. Os valores calculados das exigência nutricionais parametrizam um modelo de programação linear capaz de minimizar o custo da ração a ser fornecida. Assim, o custo da alimentação dos animais que é o único custo variável do confinamento, é calculado multiplicando-se o custo por kg da ração de custo mínimo pelo consumo voluntário de...
Tipo: Conference Paper or Presentation
Palavras-chave: Custos de produção; Programação linear; Minimização do custo da ração; Lucratividade; Production costs; Linear programming; Ration cost minimization; Profitability; Livestock Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/112737

Improving Agricultural Irrigation on the Balkhab River, Afghanistan
Provedor de dados: 31
Autores: Reeling,   Carson J.; Mitchell,   Peter; Halimi,   Ghulam Hazrat; Lee,   John G.; Carver,   Andrew.
In Afghanistan, where 80% of the population is rural, irrigated agriculture is important for satisfying subsistence needs. While most of the irrigated agriculture is fed by diversion canal systems which tap surface flows, legal and physical water infrastructure in the region is generally poor. A math programming model is used to optimize irrigation strategies under different water-availability and policy scenarios. It is found that the construction of a reservoir could increase net revenues to a representative farming community by up to 30%. However, even greater benefits may result from increasing distribution efficiencies, depending on the initial level of conveyance losses. Further, property rights schemes may be implemented to distribute wealth more...
Tipo: Conference Paper or Presentation
Palavras-chave: Linear programming; Irrigation; Afghanistan; Agricultural and Food Policy; Community/Rural/Urban Development; International Development.
Ano: 2010
URL: http://purl.umn.edu/60741

Performance and Egg Quality of Commercial Laying Hens Fed Diets Formulated Using Non-Linear Programming
Provedor de dados: 89
Autores: Almeida,TW; Silva,AL; Saccomani,AP; Muñoz,JA; Silva,RT; Franca,NV; Faria,DE; Faria Filho,DE.
ABSTRACT Feed formulation using linear programming consists of determining the mixture of feedstuffs required to meet pre-established animal nutritional requirements at the lowest cost. On the other hand, with the use of non-linear programming, it is possible to define nutritional requirements at the time of formulation, aiming at maximum profit. The objective of the present study was to compare feeds formulated using linear and non-linear programming in terms of live performance and internal and external egg quality of commercial laying hens. A total of 288 Hisex® White laying hens, 1.540 ± 0.128 g body weight, were evaluated from 33 to 45 weeks of age. Hens were distributed in a completely randomized block design, including six treatments with six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diminishing returns; Linear programming; Mathematical modeling; Meta-analysis; Profit.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300313

Optimized feed planning for a grazing horse production systems
Provedor de dados: 96
Autores: Oliveira,José Evandro Gervásio de; Soares,João Batista; Barioni,Luis Gustavo; Leite,Gilberto Gonçalves; Braga,Auro César; Menezes,Marcelo Espellet.
The objective of this study was to develop an economically optimal plan for pasture production and supplementary feeding of horses. The plan was based on the optimization of a multiperiodic linear programming model with the objective of minimizing overall feeding costs, subject to the nutritional constraints of each horse category. The model encompasses a period of one year, from January to December, divided in bimonthly periods. Technical coefficients varied among periods based on local information regarding productivity of the forage crops, taking into account the local climatic conditions and seasonality of production. Literature data on feed nutritional value (crude protein and digestible energy), dry matter intake and nutritional requirements of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linear programming; Modeling; Ration balancing.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400030

How can dairies maximize their profits and properly remunerate their dairy farmers?
Provedor de dados: 63
Autores: Meneghini,Rafael Cedric Möller; Cassoli,Laerte Dagher; Martines Filho,João Gomes; Xavier,Carlos Eduardo Osório; Santos,Marcos Veiga dos; Caixeta Filho,José Vicente; Natel,Andressa Santanna; Machado,Paulo Fernando.
ABSTRACT The current pricing process of raw milk in Brazil discourages producers from improving milk composition, which affects both yield and quality of dairy products. Furthermore, small and medium-sized dairies face great difficulties when it comes to planning production. Thus, a linear programming model was developed to price the raw milk and determine the optimal mix (combination of quantities) of dairy products that maximizes total contribution margin (TCM) under daily scenarios of high (January) and low (July) raw milk supplies (summer and winter, respectively) by comparing optimal solutions with actual results. The TCM of optimal and actual mixes were higher in January due to the greater availability of raw material. Packaging was a limiting factor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contribution margin; Dairy products; Linear programming; Milk components; Milk pricing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100051

ผลิตอาหารเสริมสำหรับเด็กและทารกที่ได้มาตรฐานในระดับอุตสาหกรรม ระยะที่ 1 (ปี 2551): การประยุกต์ใช้ Linear programming ในการพัฒนาสูตรอาหารเสริมสำหรับเด็กและทารกให้ได้มาตรฐานทางโภชนาการ
Provedor de dados: 106
Autores: Chulaluck Charunuch.
Due to studying the production of supplementary food for infant and young children at industrial level to provide the standard nutrition, the linear programming was  applied to calculate the formulas. Extrusion process was used to develop the products  because of numerous processing advantages such as high efficiency, continuous system, high throughput, low production cost and high quality with good hydrated in hot water. The method of calculation the formulas composed of preparing the data of price and nutrients per 100 grams of selected raw material. The next step limited the main constraints about the adequate nutrients in the formulas which corresponded to the Codex standards and Dietary Reference Intake (DRI). The other constraints were minimum price...
Tipo: PhysicalObject
Palavras-chave: Baby foods; Linear programming; Supplementary food; Extrusion; Young children; ทารก; เด็กเล็ก; กระบวนการเอกซ์ทรูชัน; โปรแกรมเชิงเส้น; อาหารเสริมกึ่งสำเร็จรูป; สูตรอาหาร; ชนิด; ปริมาณ; วัตถุดิบ; คุณค่าทางอาหาร; คุณภาพ; การพัฒนาคุณภาพ.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5246

การวางแผนระบบฟาร์มยางพาราในตำบลเสี้ยว อำเภอเมือง จังหวัดเลย
Provedor de dados: 106
Autores: Jirawat Jaroensathapornkul.
Objective of research was to plan the rubber-based farming system in Seaw Subdistrict, Muang District, Loei Province regarding the economically optimal cropping pattern. The researcher utilized a purposive sampling for 3 villages and then a total of 50 farmers were interviewed accidentally with the aid of structured questionnaire. The methods of descriptive analysis as well as linear programming (LP) approach were employed. The LP results were revealed mainly as follow. In the first cropping year, the net on-farm income of rubber based farming systems increased according to the replicated farm. As the result of area allocation, the optimal ratio of cultivated area for the rubber, corn and millet should be 41.20: 22.73: 36.07. Meanwhile, if the farmer would...
Tipo: Collection
Palavras-chave: Rubber; Rubber based farming systems; Inter crop; Linear programming; ยางพารา; ระบบฟาร์มยางพารา; การปลูกพืชแซม; โปรแกรมเชิงเส้น; ระบบฟาร์มจำลอง; ปัจจัยการผลิต; รายได้; ต้นทุนการผลิต; จ.เลย อ.เมือง.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5282

Energy efficiency improvement for broiler production using non-parametric techniques
Provedor de dados: 111
Autores: Ebrahimi, Sajjad; Mesri Gundoshmian, Tarahom; Abdi, Reza; Raei Jadidi, Mehri.
The goal of this study was to evaluate the sustainability and efficiency of broiler production with regard to energy consumption in Ardabil province, Iran. To reach the goal, linear programming model and Data Envelopment Analysis (DEA) were employed.  Data were collected from the farmers using a face–to–face questionnaire performed in September–December 2014 period.  The DEA application results showed that the average values of technical, pure technical and scale efficiency scores of producers were 0.949, 0.988 and 0.960, respectively.   Also, energy saving target ratio for broiler production was calculated as 8.33%, indicating that by following the recommendations resulted from this study, about 12316.85 MJ/(1000 bird) of total input energy could be saved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy efficiency; Data Envelopment Analysis; Linear programming; Technical efficiency; Broiler.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3562