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dc.contributor.authorFlaten, Ola
dc.contributor.authorBakken, Anne Kjersti
dc.contributor.authorLindås, Anitra
dc.contributor.authorSteinshamn, Håvard
dc.date.accessioned2019-11-11T13:46:30Z
dc.date.available2019-11-11T13:46:30Z
dc.date.created2019-03-13T09:36:37Z
dc.date.issued2019
dc.identifier.citationLivestock Science. 2019, 223 97-107.nb_NO
dc.identifier.issn1871-1413
dc.identifier.urihttp://hdl.handle.net/11250/2627760
dc.description.abstractThe objective of this paper was to examine how cutting frequency, silage fermentation patterns and clover performance in grass-clover swards influence the use of inputs and profitability in an organic dairy system. A linear programming model was developed to compare a three-cut and a two-cut system for a model farm in Central Norway, either with restricted or extensive silage fermentation at low or high red clover (Trifolium pratense L.) proportion in the sward, giving 8 different silage types in all. Input-output relations incorporated into the model were derived from a meta-analysis of organic grassland field trials in Norway as well as a silage fermentation experiment, and with feed intakes and milk yields from simulations with the ‘TINE Optifôr’ feed ration planner in the Norfor feed evaluation system. The model maximized total gross margin of farms with 260,000 l milk quota and housing capacity for 45 cows, with separate model versions for each of the 8 silage types. Farmland availability varied from 30 to 70 ha with 40 ha as the basis. Our results suggested that farmland availability and marginal return of a competing barley crop profoundly influenced the profitability of the different silage types. A high clover proportion increased dry matter (DM) yields and was far more important for profitability than the score on the other factors considered at restricted land availabilities. Profits with the three-cut systems were always greater than those with the two-cut systems, the former being associated with greater silage intakes and improved dairy cow performances but lower DM forage yields. Three-cut systems were further favoured as land availability increased and also by a lower marginal return of barley. Although use of an acidifying silage additive improved feed intakes and milk production per cow, the practice reduced total milk production and depressed profit compared to untreated, extensively fermented silage at restrictive land availabilities. With more land available, and in particular at a low marginal return of barley, use of a silage additive was profitable.nb_NO
dc.description.abstractForage production strategies for improved profitability in organic dairy production at high latitudesnb_NO
dc.language.isoengnb_NO
dc.subjectDigestibilitynb_NO
dc.subjectCutting systemnb_NO
dc.subjectClover proportionnb_NO
dc.subjectSilage additivenb_NO
dc.subjectMilk responsenb_NO
dc.subjectLinear programmingnb_NO
dc.titleForage production strategies for improved profitability in organic dairy production at high latitudesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.rights.holder© 2019 Elsevier B.V. All rights reserved.nb_NO
dc.subject.nsiVDP::Landbruks- og Fiskerifag: 900::Landbruksfag: 910::Husdyravl, oppdrett, forplantning: 912nb_NO
dc.source.pagenumber97-107nb_NO
dc.source.volume223nb_NO
dc.source.journalLivestock Sciencenb_NO
dc.identifier.doi10.1016/j.livsci.2019.03.004
dc.identifier.cristin1684346
dc.relation.projectNorges forskningsråd: 207755nb_NO
cristin.unitcode7677,1,0,0
cristin.unitnameDivisjon for matproduksjon og samfunn
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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