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.
2012
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Sammendrag
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Forfattere
Annika Höjer Steffen Adler Kjell Martinsson Søren K. Jensen Håvard Steinshamn Erling Thuen Anne-Maj GustavssonSammendrag
Two feeding experiments were performed to study the effects of silage botanical composition, regrowth interval and α-tocopherol supplementation on the fatty acid (FA) composition and α-tocopherol, β-carotene and retinol concentrations of milk. In Exp. 1, 24 Swedish Red dairy cows were fed two- or three-cut red clover–grass silages (R2 and R3, respectively) or two-cut birdsfoot trefoil–grass silage (B2). In Exp. 2, 16 Norwegian Red dairy cows were fed short-term ley silage with red clover (S3) or long-term ley silage with white clover (L3) in combination with the supplementation of RRR-α-tocopheryl acetate (1600 mg/day). The FA proportions in the milk and the recoveries of C18:2n-6 and C18:3n-3 were higher on the red clover diets R2 and S3 than on B2 and L3, respectively, and the n-6/n-3 FA ratio was also higher on the red clover diets. Shorter regrowth interval increased both the concentrations of FA in silage and the proportions of unsaturated FA in milk. Intakes of α-tocopherol, β-carotene and lutein were higher on B2 than on R2 due to higher silage intake on B2. However, the highest intake was seen on diet R3 due to the higher concentrations in the silage mixture. In Exp. 2, intakes of α-tocopherol, β-carotene and lutein were higher on L3. However, not all of these differences affected the milk, since the only significant differences related to silage diet in the two experiments were a higher milk α-tocopherol concentration on L3 than on S3 and a slightly lower β-carotene concentration on B2 than on R2. Supplementation with α-tocopherol increased milk α-tocopherol concentrations from 0.77 to 1.05 and from 1.07 to 1.24 mg/kg milk for S3 and L3, respectively, but did not affect milk FA composition. A higher concentration of antioxidants in the feed could be beneficial as a larger proportion of the animal's vitamin requirements would be met by the forage and the need for supplementation might decrease.
Forfattere
Annika Höjer Steffen Adler Stig Purup Hansen-Møller Jens Martinsson Kjell Håvard Steinshamn Anne-Maj GustavssonSammendrag
Phytoestrogens are hormone-like substances in plants that can substantially influence human health (positively or negatively), and when fed to dairy cows are transferred to their milk. The aim of this study was to investigate effects of varying the botanical composition and regrowth interval of legume-grass silage on silage and phytoestrogen intake and milk phytoestrogen concentrations. In one experiment, 15 Swedish Red dairy cows were fed two- or three-cut red clover-grass silage (designated R2 and R3, respectively), or two-cut birdsfoot trefoil-grass silage (B2). In a second experiment, 16 Norwegian Red dairy cows were fed short-term ley silage with red clover (S3) or long-term ley silage with white clover (L3), and the effects of supplementation with α-tocopherol were also tested. There were high concentrations of formononetin and biochanin A in all silage mixtures with red clover (R2, R3, and S3). The milk concentration of equol was highest on diet R2 (1,494 μg/kg milk). Due to metabolism of biochanin A, genistein and prunetin, their concentrations in milk and the apparent recovery were low. Coumestrol was only detected in silage mixtures S3 and L3, and its milk concentration was low. Concentrations of secoisolariciresinol and matairesinol were higher in silage mixtures B2 and L3, those with legume species other than red clover and the highest grass proportions. B2 also resulted in higher enterolactone concentration than the other diets (226 μg/kg milk). Lengthening the regrowth interval increased the intake of secoisolariciresinol and decreased recovery of lignans. Feeding long-term ley silage resulted in higher lignan milk concentrations, but lower isoflavone milk concentrations than feeding short-term ley silage. The apparent recovery of all phytoestrogens except prunetin was highest on B2, indicating that condensed tannins (present in the birdsfoot trefoil) affect rumen metabolism. There was no effect of α-tocopherol supplementation on milk concentrations of any of the measured phytoestrogens. There were variations in milk concentrations of phytoestrogens, especially of equol, among cows, which could not be explained by variations in diet composition or phytoestrogen intake. The results show that milk phytoestrogen concentration is strongly influenced by silage botanical composition and management, but questions regarding phytoestrogen metabolism remain to be answered.
Sammendrag
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Sammendrag
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Sammendrag
Denne skjøtselsplanen presenterer kystlyngheier på Dyrøya, Buøya, Grytøya og Sauøya, samt slåttemark på Dyrøya, alle i Lurøy kommune, på oppdrag fra grunneier/beitebruker og Fylkesmannen i Nordland. Skjøtselsplanen baserer seg på kartlegging av vegetasjon knyttet til kystlynghei og slåttemark. Planen anbefaler tiltak for skjøtsel av kystlynghei og slåttemark på øyene i form av fortsatt tradisjonell bruksform og bruksintensitet med beite/sein slått og hesjing eller bakketørking, samt evt. restaurering av de deler som preges av gjengroing for å reversere gjengroingsprosessen og gjenåpne landskapet. I tillegg presenterer planen også naturbeitemark og rikmyr som to andre verdifulle naturtypelokaliteter, men skjøtselsanbefalinger for disse naturtyper er ikke presentert i denne skjøtselsplan.
Sammendrag
Denne skjøtselsplan presenterer kystlyngheier på Holsmoa og Holsøya på oppdrag fra beitebruker og Fylkesmannen i Nordland. Skjøtselsplanen baserer seg på kartlegging av vegetasjon knyttet til kystlyngheiene. Planen anbefaler tiltak for skjøtsel og sviing av kystlyngheiene på Holsmoa og Holsøya.
Sammendrag
Denne skjøtselsplanen presenterer kystlynghei på Reløya på oppdrag fra grunneier og Fylkesmannen i Nordland. Skjøtselsplanen baserer seg på kartlegging av vegetasjon knyttet til kystlyngheiene. Planen anbefaler tiltak for restaurering og skjøtsel av kystlyngheiene på Reløya i form av fortsatt sauebeite og testing av sviing på avgrensede områder.
Sammendrag
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