SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

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...

Nutrition in Central Uganda - An Estimation of a Minimum Cost Healthy Diet

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

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.

Searching for Productivity Gains through 'Once-a-Day' Milking on New Zealand's Pastoral Dairy Farms

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

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...

Financing Agri-Environmental Programs in Poland: The Importance of Regional Preferences

Palavras-chave: Once-a day milking; Milk harvesting; Linear programming; Pastoral dairy farming; Livestock Production/Industries.

Ano: 2005

URL: http://purl.umn.edu/24257

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.

Analysis and optimization regarding the activity of a Hungarian Pig Sales and Purchase Cooperation

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

Development of nature-oriented dairy farm systems with an optimization model: the case of ‘Farming for Nature’ in ‘de Langstraat’, the Netherlands

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

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

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

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,...

Food vs. Wood: Dynamic Choices for Kenyan Smallholders

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

Peralta, Maria Alexandra; Swinton, Scott M..

Natural resource management

Impact of the CAP reform on small-scale grassland regions

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

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

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

AVALIAÇÃO ECONÔMICA DE DIFERENTES ESTRATÉGIAS DE GANHO DE PESO DIÁRIO NA TERMINAÇÃO DE BOVINOS EM CONFINAMENTO

Palavras-chave: Farm-level evaluation; Genetic traits; Linear programming; Farm Management.

Ano: 2003

URL: http://purl.umn.edu/57826

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...

Improving Agricultural Irrigation on the Balkhab River, Afghanistan

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

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...

Performance and Egg Quality of Commercial Laying Hens Fed Diets Formulated Using Non-Linear Programming

Palavras-chave: Linear programming; Irrigation; Afghanistan; Agricultural and Food Policy; Community/Rural/Urban Development; International Development.

Ano: 2010

URL: http://purl.umn.edu/60741

Rev. Bras. Ciênc. Avic.

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...

Optimized feed planning for a grazing horse production systems

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

R. Bras. Zootec.

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...

How can dairies maximize their profits and properly remunerate their dairy farmers?

Palavras-chave: Linear programming; Modeling; Ration balancing.

Ano: 2010

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400030

Scientia Agricola

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...

ผลิตอาหารเสริมสำหรับเด็กและทารกที่ได้มาตรฐานในระดับอุตสาหกรรม ระยะที่ 1 (ปี 2551): การประยุกต์ใช้ Linear programming ในการพัฒนาสูตรอาหารเสริมสำหรับเด็กและทารกให้ได้มาตรฐานทางโภชนาการ

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

Thai Agricultural

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

Thai Agricultural

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

CIGR Journal

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...