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dc.contributor.authorNaadland, Sondre Stokke
dc.contributor.authorSteinshamn, Håvard
dc.contributor.authorRandby, Åshild Taksdal
dc.date.accessioned2018-12-05T15:56:26Z
dc.date.available2018-12-05T15:56:26Z
dc.date.created2015-12-09T09:05:31Z
dc.date.issued2017
dc.identifier.citationOrganic Agriculture. 2017, 7 (1), 41-51.nb_NO
dc.identifier.issn1879-4238
dc.identifier.urihttp://hdl.handle.net/11250/2576232
dc.description.abstractUnder Norwegian conditions, diets based on primary growth (PG) silage typically increase milk yield compared to silage prepared from the regrowth (RG). Organic PG, dominated by immature grasses, is often high in energy and low in crude protein (CP), whereas the opposite is the case for organic RG harvests, dominated by clover. Here, we tested the hypotheses that increasing proportions of RG will reduce the total supply of metabolizable energy, but increase the CP intake, and that there is a dietary optimal mix of PG and RG to meet requirements for optimal milk production. Sixteen Norwegian Red cows were used in an experiment designed with four balanced 4 × 4 Latin squares with 21-day periods to evaluate the effect of incremental replacement of PG with RG on feed intake, nutrient digestion, and milk production. Silages were prepared from PG and RG of an organically managed grassland. Treatments comprised silages fed ad libitum with RG replacing PG in ratios of 0, 0.33, 0.67, and 1 on dry matter (DM) basis. Additionally, concentrate was offered with 8 kg for pluriparous and 7 kg for primiparous cows. The PG had higher content metabolizable energy (ME), potentially degradable neutral detergent fiber (NDF), and water-soluble carbohydrates, while RG contained more CP and indigestible NDF. The already mentioned characteristics led to higher intakes of DM, organic matter, NDF, and ME and lower intakes of CP and indigestible NDF with increasing proportions of PG in the diet. Milk yield tended to be higher when PG and RG were offered as a mixture than when fed alone. The milk fat concentration decreased linearly with increasing proportions of RG proportion, while protein concentration was unaffected by diet. This led to a similar production of energy-corrected milk among cows fed diets containing PG while cows fed pure RG diet produced 0.9 kg less daily. Silage energy concentration and energy intake influenced milk production more than CP supply.nb_NO
dc.language.isoengnb_NO
dc.relation.urihttps://link.springer.com/article/10.1007/s13165-015-0144-0
dc.subjectØkologisk husdyr produksjonnb_NO
dc.subjectOrganic livestock productionnb_NO
dc.titleEffect of replacing organic grass-clover silage from primary growth with regrowth on feed intake and milk yield of dairy cowsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.subject.nsiVDP::Fôring: 918nb_NO
dc.subject.nsiVDP::Animal feeding: 918nb_NO
dc.source.pagenumber41-51nb_NO
dc.source.volume7nb_NO
dc.source.journalOrganic Agriculturenb_NO
dc.source.issue1nb_NO
dc.identifier.doi10.1007/s13165-015-0144-0
dc.identifier.cristin1298579
dc.relation.projectNorges forskningsråd: 207755nb_NO
cristin.unitcode192,10,1,0
cristin.unitnameInstitutt for husdyr- og akvakulturvitenskap
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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