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Search: WFRF:(Hansson Oskar) > Agricultural Sciences

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  • Hansson, Ingrid, et al. (author)
  • Differences in Genotype and Antimicrobial Resistance between Campylobacter spp. Isolated from Organic and Conventionally Produced Chickens in Sweden
  • 2021
  • In: Pathogens. - : MDPI. - 2076-0817. ; 10:12
  • Journal article (peer-reviewed)abstract
    • Antibiotic resistance is a major challenge worldwide and increased resistance to quinolones in Campylobacter is being reported. Analysis of antibiotic resistance was performed on 157 Campylobacter strains (123 C. jejuni and 34 C. coli) from conventional and organic chickens produced in Sweden. Susceptibility for tetracycline, ciprofloxacin, erythromycin, nalidixic acid, streptomycin, and gentamycin was determined by microdilution. All 77 isolates from organic chickens were sensitive to all antibiotics, except two C. jejuni that were resistant to tetracycline. Of the 80 isolates from conventional chickens, 22.5% of C. jejuni and 11.1% of C. coli were resistant to quinolones and 5.6% of C. jejuni were resistant to tetracycline. Whole-genome sequencing resulted in 50 different sequence types of C. jejuni and six of C. coli. Nine sequence types were found in both organic and conventional chickens. Two of these (ST-19 and ST-257) included isolates from conventional broilers with different resistance phenotypes to the remaining isolates from conventional and organic broilers. There are management differences between the production systems, such as feed, breed, use of coccidiostats, and access to outdoor area. It is unlikely that quinolone resistance has arisen due to use of antimicrobials, since fluoroquinolones are not permitted in Swedish broiler production.
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  • Hansson, Julia, et al. (author)
  • How is biodiversity protection influencing the potential for bioenergy feedstock production on grasslands?
  • 2018
  • In: Global Change Biology Bioenergy. - : Wiley. - 1757-1693 .- 1757-1707. ; 11:3, s. 515-538
  • Journal article (peer-reviewed)abstract
    • Sustainable feedstock supply is a critical issue for the bioenergy sector. The sustainability criteria for biofuels in the EU Renewable Energy Directive (RED) prohibit the use of raw material from land with high biodiversity, i.e., areas designated for nature protection purposes, primary forest and highly biodiverse grassland. This paper addresses how biodiversity considerations influence the prospects for biomass production for bioenergy on grasslands. No globally established approach exists to assess and quantify grassland availability for bioenergy while considering biodiversity. We investigate how biodiverse grasslands are considered in (i) assessments of bioenergy supply potentials; (ii) the RED, the EU Common Agricultural Policy (CAP), and the UN Convention on Biological Diversity (CBD); and (iii) land-use governance and nature protection in Brazil. Estimates of biomass supply potentials commonly treat biodiverse grasslands as unavailable for bioenergy, when considering broader nature protection requirements. Few studies allow for a direct quantification of how biodiversity considerations relating to grasslands influence the global biomass supply potential. The definitions of natural and non-natural grassland in the RED are similar to those in the CAP. The RED complements and strengthens the protective ambitions in the CAP and CBD, but a lack of clear definitions and guidance in relation to the RED creates uncertainty about the prospects for biofuels from grasslands on the EU market. For EU-28, an estimated 39-48% (about 9-11 Mha) and 15-54% (about 10-38 Mha) of natural and non-natural grassland, respectively, may be considered highly biodiverse. In Brazil, economic-ecological zoning can be important for grassland conservation since almost half of the native grassland on private land is unprotected and subject to farmers’ preferences, which may favor protecting forest over grassland. Further clarification of grassland definitions and delineation in regulations will significantly influence the prospects for bioenergy from grasslands, and the impacts of bioenergy deployment on biodiversity.
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