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.
2019
Forfattere
Boris Fuchs Kristin Sørheim Matteo Chincarini Emma Brunberg Solveig Marie Stubsjøen Kjell Bratbergsengen Svein-Olaf Hvasshovd Barbara Zimmermann Unni Støbet Lande Lise GrøvaSammendrag
Advantages of low input livestock production on large pastures, including animal welfare, biodiversity and low production costs are challenged by losses due to undetected disease, accidents and predation. Precision livestock farming (PLF) enables remote monitoring on individual level with potential for predictive warning. Body temperature (Tb) and heart rate (HR) could be used for early detection of diseases, stress or death. We tested physiological sensors in free-grazing Norwegian white sheep in Norway. Forty Tb sensors and thirty HR sensors were surgically implanted in 40 lambs and 10 ewes. Eight (27%) of the HR and eight (20%) of the Tb sensors were lost during the study period. Two Tb sensors migrated from the abdominal cavity in to the digestive system. ECG based validation of the HR sensors revealed a measurement error of 0.2 bpm (SD 5.2 bpm) and correct measurement quality was assigned in 90% of the measurements. Maximum and minimum HR confirmed by ECG was 197 bpm and 68 bpm respectively. Mean passive HR was 90 bpm (SD=13 bpm) for ewes and 112 bpm (SD=13 bpm) for lambs. Mean Tb for all animals was 39.6°C (range 36.9 to 41.8°C). Tb displayed 24-hour circadian rhythms during 80.7 % but HR only during 41.0 % of the studied period. We established baseline values and conclude that these sensors deliver good quality. For a wide agricultural use, the sensor implantation method has to be further developed and real-time communication technology added.
Forfattere
Liv ØstremSammendrag
Det er ikke registrert sammendrag
Forfattere
Åshild Taksdal Randby Astrid Johansen Linda Rønning Linda KarlssonSammendrag
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Sammendrag
Formålet med prosjektet var å kartlegge risiko for belastning og skade på reindriftsutøveren under ulike aktiviteter innen reindrift. Ved hjelp av videofilmer, arbeidsoppgavekartlegging, observasjon, intervjuer og registreringer av bl.a. vibrasjoner og hjertefrekvens kunne en vurdere fysisk og mental arbeidsbelastning under ulike definerte arbeidsoppgaver. Åtte arbeidsoppgaver ble identifisert og beskrevet. Av disse er arbeid med dyr i gjerdet det mest fysiske belastende, målt ved hjelp av hjertefrekvens. Dette står i kontrast til det reindriftsutøverne selv opplever som mest belastende, nemlig arbeid utenfor gjerdet (kjøring og vedlikehold og reparasjon av gjerdet). En sammenheng mellom dårlige lysforhold og langvarig opphold i kulde kan tenkes å være årsaken til at arbeid utenfor gjerdeanlegget innebærer en større opplevd belastning. I et gjerdeanlegg er det i tillegg flere folk som jobber sammen, det er mer kontrollerte forhold med lys og større anledning til å variere arbeidet og ta pauser når man trenger det.....
Forfattere
Tomasz Leszek WoznickiSammendrag
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Sammendrag
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Forfattere
Eva Narten HøbergSammendrag
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Sammendrag
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Sammendrag
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Forfattere
Inger Maren Rivrud Shane Frank Richard Bischof Atle Mysterud Sam Steyaert Anne Gabriela Hertel Snorre Hagen Hans Geir Eiken Jon Swenson Andreas ZedrosserSammendrag
Wild animal populations experience selection pressures from both natural and anthropogenic sources. The availability of extensive pedigrees is increasing along with our ability to quantify the heritability and evolvability of phenotypic traits and thus the speed and potential for evolutionary change in wild populations. The environment may also affect gene expressions in individuals, which may in turn affect the potential of phenotypic traits to respond to selection. Knowledge about the relationship between the genetic and environmental components of phenotypic variation is particularly relevant, given ongoing anthropogenically driven global change. Using a quantitative genetic mixed model, we disentangled the genetic and environmental components of phenotypic variance in a large carnivore, the brown bear (Ursus arctos). We combined a pedigree covering ~1,500 individual bears over seven generations with location data from 413 bears, as well as data on bear density, habitat characteristics, and climatic conditions. We found a narrow‐sense heritability of 0.24 (95% CrI: 0.06–0.38) for brown bear head size, showing that the trait can respond to selection at a moderate speed. The environment contributed substantially to phenotypic variation, and we partitioned this into birth year (5.9%), nonadditive among‐individual genetic (15.0%), and residual (50.4%) environmental effects. Brown bear head circumference showed an evolvability of 0.2%, which can generate large changes in the trait mean over some hundreds of generations. Our study is among the first to quantify heritability of a trait in a hunted large carnivore population. Such knowledge about the degree to which species experiencing hunting can respond to selection is crucial for conservation and to make informed management decisions. We show that including important environmental variables when analyzing heritability is key to understanding the dynamics of the evolutionary potential of phenotypic traits.