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Sökning: db:Swepub > Linköpings universitet > Högskolan i Skövde > Lantbruksvetenskap

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1.
  • Frisk, Mikael, et al. (författare)
  • Route optimization as an instrument to improve animal welfare and economics in pre-slaughter logistics
  • 2018
  • Ingår i: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 13:3
  • Tidskriftsartikel (refereegranskat)abstract
    • Each year, more than three million animals are transported from farms to abattoirs in Sweden. Animal transport is related to economic and environmental costs and a negative impact on animal welfare. Time and the number of pick-up stops between farms and abattoirs are two key parameters for animal welfare. Both are highly dependent on efficient and qualitative transportation planning, which may be difficult if done manually. We have examined the benefits of using route optimization in cattle transportation planning. To simulate the effects of various planning time windows and transportation time regulations and number of pick-up stops along each route, we have used data that represent one year of cattle transport. Our optimization model is a development of a model used in forestry transport that solves a general pick-up and delivery vehicle routing problem. The objective is to minimize transportation costs. We have shown that the length of the planning time window has a significant impact on the animal transport time, the total driving time and the total distance driven; these parameters that will not only affect animal welfare but also affect the economy and environment in the pre-slaughter logistic chain. In addition, we have shown that changes in animal transportation regulations, such as minimizing the number of allowed pick-up stops on each route or minimizing animal transportation time, will have positive effects on animal welfare measured in transportation hours and number of pick-up stops. However, this leads to an increase in working time and driven distances, leading to higher transportation costs for the transport and negative environmental impact.
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2.
  • Lindström, Tom, et al. (författare)
  • A spectral and Bayesian approach for analysis of fluctuations and synchrony in ecological datasets
  • 2012
  • Ingår i: Methods in Ecology and Evolution. - : Wiley-Blackwell. - 2041-210X. ; 3:6, s. 1019-1027
  • Tidskriftsartikel (refereegranskat)abstract
    • Autocorrelation within ecological time series and synchrony between them may provide insight into the main drivers of observed dynamics. We here present methods that analyse autocorrelation and synchrony in ecological datasets using a spectral approach combined with Bayesian inference. To exemplify, we implement the method on dendrochronological data of the pedunculate oak (Quercus robur). The data consist of 110 years of growth of 10 live trees and seven trees that died during a synchronized oak death in Sweden in c. 2002-2007. We find that the highest posterior density is found for a noise colour of tree growth of gamma approximate to 0.95 (i.e. pink noise) with little difference between trees, suggesting climatic variation as a driving factor. This is further supported by the presence of synchrony, which we estimate based on phase-shift analysis. We conclude that the synchrony is time-scale dependent with higher synchrony at larger time-scales. We further show that there is no difference between the growth patterns of the alive and dead tree groups. This suggests that the trees were driven by the same factors prior to the synchronized death. We argue that this method is a promising approach for linking theoretical models with empirical data.
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Wennergren, Uno (2)
Lindström, Tom (1)
Flisberg, Patrik (1)
Rönnqvist, Mikael (1)
Bergman, Karl-Olof (1)
Sisson, Scott A (1)
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Jonsson, Annie (1)
Sellman, Stefan (1)
Frisk, Mikael (1)
Håkansson, Nina (1)
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