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dc.contributor.authorWright, M.M.
dc.contributor.authorAuldist, M.J.
dc.contributor.authorKennedy, Emer
dc.contributor.authorDunshea, F.R.
dc.contributor.authorGalvin, N.
dc.contributor.authorHannah, M.C.
dc.contributor.authorWales, W.J.
dc.date.accessioned2021-06-16T11:36:19Z
dc.date.available2021-06-16T11:36:19Z
dc.date.issued2020-07
dc.identifier.citationM.M. Wright, M.J. Auldist, E. Kennedy, F.R. Dunshea, N. Galvin, M.C. Hannah, W.J. Wales, Evaluation of the n-alkane technique for estimating the individual intake of dairy cows consuming diets containing herbage and a partial mixed ration, Animal Feed Science and Technology, 2020, 265, 114524. DOI: https://doi.org/10.1016/j.anifeedsci.2020.114524en_US
dc.identifier.urihttp://hdl.handle.net/11019/2454
dc.descriptionpeer-revieweden_US
dc.description.abstractEstimation of dry matter intake (DMI) using the n-alkane technique was evaluated in lactating dairy cows fed fresh herbage and a partial mixed ration (PMR). Four dietary treatments were investigated in a 2 × 2 factorial experiment using 16 Holstein-Friesian dairy cows. Dietary treatments were combinations of low and high amounts of fresh herbage (8 or 14 kg DM/cow per day) and PMR supplement (6 or 12 kg DM/cow per day). The pre-experimental period was 14 days followed by a 10-day experimental period. Cows were housed in individual metabolism stalls to allow for accurate measurement of DMI and total fecal output. Fecal n-alkane recovery rates were calculated to determine the most accurate corrections for incomplete fecal n-alkane recovery. The n-alkane technique accurately estimated DMI when corrected for incomplete fecal recovery using both published recovery rates and recovery rates calculated in this experiment. The most accurate application of recovery rates was with those calculated for each combination of dietary treatments, compared with using an average recovery rate. This research has important implications for the future use of the n-alkane technique, especially in PMR feeding systems. The discrepancy between estimated (when treatment recovery rates were applied) and measured herbage DMI increased with the amount of herbage offered but was not affected by amount of PMR. It was also found that the recovery rates of all natural n-alkanes increased as the amount of herbage increased. This research demonstrates that the n-alkane technique can be used to accurately estimate individual cow intake when fresh herbage and PMR are offered separately, evidenced by strong Lin’s concordance estimates.en_US
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.relation.ispartofseriesAnimal Feed Science and Technology;265
dc.rights© 2020 Published by Elsevier B.V.
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttps://www.elsevier.com/tdm/userlicense/1.0/
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectDry matter intakeen_US
dc.subjectn-Alkaneen_US
dc.subjectHerbageen_US
dc.subjectPartial mixed rationen_US
dc.subjectDairy cowsen_US
dc.titleEvaluation of the n-alkane technique for estimating the individual intake of dairy cows consuming diets containing herbage and a partial mixed rationen_US
dc.typeArticleen_US
dc.embargo.terms2021/04/28en_US
dc.identifier.doihttps://doi.org/10.1016/j.anifeedsci.2020.114524
dc.contributor.sponsorDJPRen_US
dc.contributor.sponsorVictoriaen_US
dc.contributor.sponsorDairy Australiaen_US
dc.source.volume265
dc.source.beginpage114524
refterms.dateFOA2021-04-28T00:00:00Z
dc.source.journaltitleAnimal Feed Science and Technology


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