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.
2023
Forfattere
Martha Grøseth Linda Karlsson Håvard Steinshamn Marianne Johansen Alemayehu Kidane Egil PrestløkkenSammendrag
Increasing the protein value in grass silages for dairy cows is of interest to increase use of homegrown protein sources and reduce nitrogen (N) losses to the environment. Studies have shown that wilting of grass silage can improve the metabolizable protein (MP) value by increasing the rumen microbial protein yield (MCP) and rumen escaped feed protein. We hypothesised that feeding wilted grass silage can improve milk and milk protein production in dairy cows and reduce the need for MP, estimated as amino acids absorbed in the small intestine (AAT), in concentrate. To test this, a continuous feeding experiment with 48 early to mid-lactation Norwegian Red dairy cows, kept in a loose housing system was conducted. Treatments were first cut grass silages from round bales, harvested at early booting from a sward of timothy (Phleum pratense), perennial rye grass (Lolium perenne) and meadow fescue (Festuca pratensis), wilted to 260 and 417 g dry matter (DM)/kg fresh matter. The grass silage was fed ad libitum and supplied with 8.3 kg/d of concentrate, either low (108 g AAT/kg DM) or high (125 g AAT/kg DM) in MP concentration, in a 2×2 factorial arrangement. The experiment lasted for 11 weeks, with the 2 first weeks, where cows received same feeding, used as covariate, and the last 4 weeks were used as data collection period. Wilting reduced fermentation products, ammonia and soluble N in the grass silage, while increased residual water-soluble carbohydrates, like expected. However, there was no difference between treatments in daily silage DM intake (13.1 kg) and milk yield (30.2 kg) or milk content, but feeding high MP concentrate increased urea and uric acid in urine. No major differences were found for rumen pH, amino acids in blood plasma or purine derivatives over creatinine index, as indirect estimate for MCP. In conclusion, high silage DM and high MP in concentrate did not increase the milk production in this study.
Forfattere
Shelemia Nyamuryekung'e Glenn Duff Santiago Utsumi Richard Estell Matthew M. McIntosh Micah Funk Andrew Cox Huiping Cao Sheri Spiegal Andres Perea Andres F. CibilsSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Mange bønder har byrja å bestemme slåttetidspunktet ved aktiv bruk av varmesum. Det sikraste er nok likevel å observere utviklingstrinnet på deu artane du har i enga.
Forfattere
Anne Kjersti Bakken Marianne Bechmann Helge Bonesmo Ola Flaten Geir Wæhler Gustavsen Torbjørn Haukås Agnar Hegrenes Line Johansen Ingeborg Klingen Sigrun Hjalmarsdottir Kværnø Eva Skarbøvik Håvard Steinshamn Marianne Stenrød Anja Celine Winger Anne Falk Øgaard Audun KorsæthSammendrag
Det er ikke registrert sammendrag
Forfattere
Caroline Chylinski Kristin Fløgstad Degnes Inga Marie Aasen Sokratis Ptochos Berit Marie Blomstrand Karl-christian Mahnert Heidi L Enemark Stig Milan Thamsborg Håvard Steinshamn Spiridoula AthanasiadouSammendrag
The antiparasitic potential of plants could offer a vital solution to alleviating the costs of gastrointestinal nematode (GIN) infections in ruminant production globally. Leveraging known bioactive molecules, however, is complex, where plant species, extraction processes and seasonality impact bioavailability and efficacy. This study assessed the impact of a comprehensive set of factors on the antiparasitic activity of Norwegian conifers to identify bark compounds specific against GIN. Antiparasitic activity was determined using in vitro assays targeting morphologically distinct life stages of ovine GIN: the egg hatch assay and larval motility assay. In depth characterisation of the chemical composition of the bark extracts was carried out using chromatographic separation, UV-absorbance, and molecular mass profiles to identify compounds implicated in the activity. Three key findings emerged: (1) the activity of bark extracts varied markedly from 0 to 100% antiparasitic efficacy, owing to tree species, extraction solvent and seasonality; (2) the GIN exhibited species-and stage-specific susceptibility to the bark extracts; (3) the presence of condensed tannins, amongst other compounds, was associated with anthelmintic activity. These findings add new insights into urgently needed alternative parasite control strategies in livestock.
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Quentin Lardy Mohammad Ramin Vibeke Lind Grete H. M. Jørgensen Mats Höglind Emma Matilda Ternman Mårten HettaSammendrag
Det er ikke registrert sammendrag
Forfattere
Khaled Murad AghaSammendrag
Det er ikke registrert sammendrag