Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2024
Abstract
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Abstract
Det er ikke registrert sammendrag
Authors
Hiva Asadikia Seyed Habibollah Mosavi Tannaz Alizadeh Ashrafi Michael R. Reed Shraddha Hegde Hamed Najafi AlamdarloAbstract
Energy and imported trout egg subsidies hold a pivotal role for Iranian trout farms. They aim to decrease production costs, yet their impact on the profit efficiency of farms remains dubious. The first objective of this paper is to assess how the current subsidy scheme affects the profit efficiency of hatchery and propagation trout farms in Mazandaran, Iran. We examine several subsidy reform scenarios to enhance profit efficiency as a second objective. Standard profit efficiency (SPE) is used to acquire the efficiency of the trout farms using data envelopment analysis. Results show that the majority of farms are inefficient and highly dependent on subsidies. Comparing farms with high efficiency against those with low efficiency as a third aim of research highlights the importance of farms holding a propagation license, engaging in vertical integration, achieving adult trout production surpassing 81 t, and maintaining a fish total feed consumption to trout production ratio below 0.74. Findings from reformation scenarios reveal 1) redirecting the current subsidy towards purchasing the extruder machines for fish feed production, 2) transferring funds to subsidize electricity based on the farm's electricity consumption, and 3) opting for the production of genetically modified eggs gives higher SPE. Reformation can also reduce the burden on public funds and dependency on importation.
Authors
Lampros Lamprinakis Luca Mulazzani Cyril Tisseyre Burkhard Schaer Hilde Halland Signe Kårstad Giulio Malorgio Marta Verza Cosimo Rota Diva Fernandez Francesca Marino Gabriele Miserendino Konstadinos MattasAbstract
Det er ikke registrert sammendrag
Abstract
Apples are a healthy and environmentally friendly snack, but the consumption of apples in many countries, including Norway, has decreased in the last fifteen years. This trend has a potential negative impact on public health and the environment. In this paper, we use a consumer survey and a random effect ordered logistic regression model to find out what is most important for people when they buy apples. Ten different values are considered and ranked according to individual’s importance. We find that taste and safety are the most important values for the average individual’s choice of apples, while the appearance and type of apple rank third. The least important values are wrapping size and regional origin. Everyday apple eaters are more concerned about pesticide use and less concerned about price than the average consumers. Furthermore, compared to the average consumer, those with low levels of trust in apple producers and authorities care more about pesticides and environmentally friendly production methods, while consumers with a high level of trust care less about these aspects. Our results indicate that to increase the consumption of Norwegian apples, it is important to maintain or improve their reputation as being tasty and safe to eat.
Authors
Rasmus Bang Bjørn Gunnar Hansen Mario Guajardo Jon Kristian Sommerseth Ola Flaten Leif Jarle AsheimAbstract
CONTEXT An important question for farmers is whether to run their farm conventionally or organically. This choice can significantly affect the farm's financial performance and its impact on the environment. OBJECTIVE The primary objective of this study is to compare the profitability of conventional and organic cattle systems and investigate how it is associated with individual farm characteristics, like forage production capacity, forage quality, milk quota, animal housing capacity, and their relative presences. METHOD We employ a whole farm optimization model, customized for Norwegian cattle farming. The primary goal of this model is to maximize the gross margin by optimizing decisions related to land usage and animal inventory while adhering to a set of constraints. We systematically solve more than 200,000 model instances, with varying farm characteristics. RESULTS AND CONCLUSIONS The results can be distilled to the following key points: If forage of good quality is readily available, but the livestock operation cannot be expanded due to animal housing and milk quota restrictions, organic may outcompete conventional farming. Otherwise, gross margin is maximized with conventional farming. These findings emphasize the crucial role of forage production capacity and quality in relation to available milk quota and infrastructure when considering the transition from conventional to organic farming. Extensive sensitivity analyses affirm the robustness of these conclusions. Regional regulatory factors, such as government farm payments, also play a significant role, and influence the optimal farming approach. Additionally, we show that increases in organic price premiums can markedly impact the competitiveness of organic farming, even in a system where government payments make out a significant part of the farm revenue. SIGNIFICANCE The model can support farmers to make informed decisions about converting to organic or conventional farming. It can also be used by policymakers to determine the level of support required to make it worthwhile for different types of farms to convert. We also show that existing government payment schemes give rise to regional differences in the incentives for organic farming in Norway. To ensure equal incentives for organic farming across the country, the organic payments would have to be regionally adjusted, in line with the other already regionally dependent government payments. This insight may be of significant interest to policymakers and other stakeholders.
Authors
Mario Guajardo Rasmus Bang Leif Jarle Asheim Ola Flaten Bjørn Gunnar Hansen Jon Kristian SommersethAbstract
Det er ikke registrert sammendrag
Authors
Mario Guajardo Rasmus Bang Leif Jarle Asheim Ola Flaten Bjørn Gunnar Hansen Jon Kristian SommersethAbstract
Interest for organic products and concerns regarding sustainable practices raise an important question for farmers: should they run their farms conventionally or organically? We address this question by means of a mathematical programming model, which aims to optimize gross margin of cattle farms. We implement the model using data from Norway, including government support stipulations and a number of other features. A computational study allows us to assess the economic performance of organic farming compared to conventional farming systems. We derive some insights into the conditions when organic outperforms conventional systems, and vice versa. These hold significant relevance not only to farmers, but also to farm advisors and policy makers.
Abstract
Housing and indoor feeding of sheep is required throughout the cold season, which can last more than half a year, in Nordic highlands and Alpine regions. This study aimed to examine and evaluate the housing costs, including labour requirements, according to type of sheep housing system and degree of mechanized feeding by investigating systems commonly used in Nordic and Alpine regions. Detailed cost data were obtained from 61 surveyed sheep farmers in Norway with sheep houses built between the years 2008 and 2015. Costs were calculated for a baseline scenario (2021-prices) as well as for five scenarios at low and high discount rates and opportunity cost of labour, and high energy prices. The median (interquartile range) flock size was 150 (100) winter-fed sheep. Houses with slatted floors were more expensive than deep-litter systems. Costs of bedding material and feed waste were however higher, and the net value of the manure were lower in houses with deeplitter systems. At the baseline assumptions, overall net housing costs per sheep was not statistically different among the main housing types studied. Multiple regression analyses showed that net housing costs per sheep were lower in larger flocks and for centrally located farms (control variables). Undertaking daily chores, such as feeding of roughages twice a day rather than once, resulted in significantly higher net housing costs. Mechanized feeding of roughages, and even more so for concentrates, were not economically justified since labour savings were not sufficient to pay for the additional capital costs. A round bale chopper lowered net housing costs, significantly at a high labour cost. None of the scenarios found slatted floors to be significantly more expensive than deep-litter systems. High costs of labour and capital favoured deep-litter systems, while slatted floor systems were more advantageous at rising prices of energy that resulted in increased values of organic manures and costs of feed wastes and bedding materials. The study was based on a decade old data from common Norwegian sheep house variants. Farmers that consider constructing a new sheep house today, still must compare these variants as their main alternatives. We encourage other researchers to include effects of housing systems and mechanized feeding on animal performance, health, and welfare. Moreover, future studies should preferably also be undertaken in other environmental or socio-economic settings to produce more general results.
Authors
Anne Falk Øgaard Valborg Kvakkestad Kristian Bjerke Eva Brod Erin Byers Astrid Solvåg Nesse Michal Sposob Nhat Strøm-Andersen Simen Wilsher-LohreAbstract
Denne rapporten er skrevet på oppdrag fra Landbruks- og matdepartementet (LMD). NIBIO har utredet egnethet, gjennomførbarhet og mulige løsninger for krav om en minimumsandel resirkulert fosfor ved salg av fosforholdig gjødsel, dvs. et omsetningskrav. Denne utredningen estimerer mengder av ulike resirkulerbare fosforkilder. Fosforoverskudd i enkelte regioner gitt ulike begrensninger på hvor mye fosfor som kan tilføres i jordbruket er estimert for nå-situasjon og 10 år fram i tid. Videre gir utredningen en oversikt over teknologiske og regulatoriske muligheter for å produsere gjødselvarer basert på resirkulert fosfor, samt en oversikt over innhold av uønskede stoffer i ulike typer fosforkilder. Vi gjennomførte 26 intervjuer med aktører i hele verdikjeden for gjødsel med spørsmål angående et omsetningskrav for resirkulert fosfor: Gjødselprodusenter, forhandlere, kjøpere, landbruksrådgivningen, offentlige myndigheter, og aktører innenfor transport og teknologi. I tillegg til vurderingen av egnethet og gjennomførbarhet av et omsetningskrav for resirkulert fosfor har vi også gjort en kortfattet vurdering av mulige andre løsninger for å stimulere erstatning av mineralfosfor med resirkulert fosfor. Se kapittel 10 for sammendrag og konklusjoner fra rapporten og oppsummeringer i slutten av de enkelte kapitlene for sammenfatning av resultater.