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.
2018
Sammendrag
Formålet med denne rapporten var å samanlikne lønsemda i enkelte driftsopplegg for mjølke- og kjøttproduksjon. Analysen er avgrensa til Oslo, Akershus og Hedmark fylke. Det er to hovudspørsmål: Kva kan ein maksimalt betale for leige av mjølkekvote før kjøttproduksjon på ammeku er like lønsamt som utviding av mjølkeproduksjon på leigd mjølkekvote? Er sal av fôringskalv like lønsamt som framfôring av alle kalvar? Rapporten viser korleis svaret på desse spørsmåla varierer med føresetnadene og dermed vilkåra for å drive produksjon........
Sammendrag
Strategiplanen oppsummerer Genbanken for verpehøns sitt samfunnsoppdrag de neste ti årene som vurderes å ha tre hovedkomponenter; 1) Sikre genetikken i den eneste norske hønserasen jærhøna og de fire verpehønslinjene som forsynte det norske hønseeggmarkedet fram til 1995. 2) Bidra til god helsestatus i norsk fjørfeproduksjon ved salg av smittefritt dyremateriale til hobbyfjørfemiljøet og mindre eggprodusenter. 3) Levere dyremateriale til forskning.
Forfattere
Anne Falk Øgaard Ola Stedje Hanserud Marianne Bechmann Annbjørg Kristoffersen Åge MolversmyrSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Pieternella C. Luttikhuizen Freek H. M. van den Heuvel Celine Rebours Harry J. Witte Judith D. L. van Bleijswijk Klaas TimmermansSammendrag
Kelp aquaculture is globally developing steadily as human food source, along with other applications. One of the newer crop species is Saccharina latissima, a northern hemisphere kelp inhabiting temperate to arctic rocky shores. To protect and docu-ment its natural genetic variation at the onset of this novel aquaculture, as well as increase knowledge on its taxonomy and phylogeography, we collected new geneticdata, both nuclear and mitochondrial, and combined it with previous knowledge to estimate genetic connectivity and infer colonization history. Isolation-with- migration coalescent analyses demonstrate that gene flow among the sampled locations is vir -tually nonexistent. An updated scenario for the origin and colonization history of S. latissima is developed as follows: We propose that the species (or species complex) originated in the northwest Pacific, crossed to the northeast Pacific in the Miocene, and then crossed the Bering Strait after its opening ~5.5 Ma into the Arctic and northeast Atlantic. It subsequently crossed the Atlantic from east to west. During the Pleistocene, it was compressed in the south with evidence for northern refugia in Europe. Postglacial recolonization led to secondary contact in the Canadian Arctic. Saccharina cichorioides is shown to probably belong to the S. latissima species com -plex and to derive from ancestral populations in the Asian North Pacific. Our novel approach of comparing inferred gene flow based on coalescent analysis versus Wright’s island model suggests that equilibrium levels of differentiation have not yet been reached in Europe and, hence, that genetic differentiation is expected to in -crease further if populations are left undisturbed.
Foredrag – Størrelsessortering av kornpartier med høyt innhold av Fusarium/mykotoksiner.
Guro Brodal
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
The prevalence of livestock grazing in wildlife area s is increasing. This transformation of ecosys- tems into agroecosystems is concerning because the intr oduction of new species may cause niche displacement of the functionally related native species. We used a la rge-scale fence scheme and f ecal analyses to study the in fl uence of free-ranging livestock on moose diet on thr ee boreal forest ranges. We found low interspeci fi cdiet overlap between moose and livestock (mean Pianka ’ s O across ranges = 0.21, SD = 0.104), and the diet overlap with livestock did not differ between moose in areas with livestock and in adjacent control areas without live- stock. Still, moose sympatric with livestock had less fe cal nitrogen (a proxy for diet quality) than moose in the control areas. Our fi ndings suggest that interspeci fi c interactions other than direct food competition contributed to reduce the moose ’ foraging opportunities, such as altered forag e abundance and composition, or behavioral avoidance of livestock. We caution that displacement in the foodscape (i.e., spati otemporal use of food) can occur through pathways not evident in niche indices based on composition of plant species in the diet.
Sammendrag
A number of factors such as low soil temperature, desiccation and thatch can be serious limiting factors for the successful reestablishment of golf greens following winter damages. The rate of germination and seedling root growth have important implications for competition between species on a golf green. This research project has shown that P. annua is a very competitive species, due to quicker germination at lower temperatures, especially compared to A. stolonifera and F. rubra ssp communtata. Root growth of P.annua was also significantly quicker than of the Agrostis species tested. Seedlings of Agrostis species and F.rubra ssp commutata that germinate in close proximity to P. annua seedlings stand a large chance of being choked out. In order to reduce competition with P.annua, early seeding should be avoided. In this study, no difference in turfgrass establishment wasobserved when seedlings were grown using soil water extracts or soil from an ice-encased green,compared to a control. However, further investigations regarding reestablishment following iceencasement are warrant, and should be investigated on older greens with a higher organic mattercontent. The results from the demonstration trials emphasize the importance of using a sowingtechnique that ensures proper seed – soil contact. This is of particular importance for theestablishment of turfgrass species on golf greens, due to the high risk of desiccation.
Sammendrag
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