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dc.contributor.authorBeltran, I. E.en
dc.contributor.authorGregorini, Pabloen
dc.contributor.authorDaza, J.en
dc.contributor.authorBalocchi, O. A.en
dc.contributor.authorMorales, A.en
dc.contributor.authorPulido, R. G.en
dc.date.accessioned2019-12-02T22:58:24Z
dc.date.available2019-11-13en
dc.date.issued2019-11-13en
dc.date.submitted2019-11-08en
dc.identifier.citationBeltran, I. E., Gregorini, P., Daza, J., Balocchi, O. A., Morales, A., & Pulido, R. G. (2019). Diurnal concentration of urinary nitrogen and rumen ammonia are modified by timing and mass of herbage allocation. Animals, 9(11), 961. doi:10.3390/ani9110961en
dc.identifier.issn2076-2615en
dc.identifier.urihttps://hdl.handle.net/10182/11168
dc.description.abstractThe objective of this work was to evaluate whether changes in time of herbage allocation and herbage mass (HM) (low (L) or medium (M)) modify the diurnal pattern of urinary nitrogen (N) concentration and ruminal ammonia (NH₃) of lactating dairy cows. Four Holstein-Friesian cows fitted with rumen cannula were randomly allocated to one of four treatments: 1) low herbage mass in the morning (L-AM) (Access to new herbage allocation after morning milking with a herbage mass (HM) of 2000 kg DM/ha); 2) low herbage mass in the afternoon (L-PM) (Access to new herbage allocation after afternoon milking with a HM of 2000 kg DM/ha); 3) medium herbage mass in the morning (M-AM) (Access to new herbage allocation after morning milking with a HM of 3000 kg DM/ha); and 4) medium herbage mass in the afternoon (M-PM) (Access to new herbage allocation after afternoon milking with a HM of 3000 kg DM/ha). A four by four Latin Square design with four treatments, four cows, and four experimental periods was used to evaluate treatment effects. Rumen NH₃ concentration was greater for L-AM compared to L-PM and M-PM at 13:00 and 16:00 h. Urine urea and N concentrations were lower for M-AM compared to L-AM. Urine N concentration was greater for L-AM than other treatments at 10:00 hours and greater for M-PM compared to M-AM at 16:00 hours. Results suggest that maintaining the cows in the holding pen at the milking parlor for two hours after morning grass silage supplementation for L-AM and for two hours after afternoon grass silage supplementation for M-PM, could allow collection of urine from cows at the holding pen and storage of urine in the slurry pit during the time of peak N concentration, returning cows to the pasture at a time of day when urinary N concentration is decreased.en
dc.format.extent12en
dc.languageenen
dc.language.isoenen
dc.publisherMDPIen
dc.relationThe original publication is available from - MDPI - https://doi.org/10.3390/ani9110961en
dc.relation.urihttps://doi.org/10.3390/ani9110961en
dc.rights© 2019 by the authors.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectcircadian nitrogen excretionen
dc.subjectgrazing managementen
dc.subjectrumen ammoniaen
dc.subjectdairy cowsen
dc.titleDiurnal concentration of urinary nitrogen and rumen ammonia are modified by timing and mass of herbage allocationen
dc.typeJournal Article
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Agricultural Sciencesen
lu.contributor.uniten
lu.contributor.uniten
dc.identifier.doi10.3390/ani9110961en
dc.subject.anzsrc0702 Animal Productionen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.relation.isPartOfAnimalsen
pubs.issue11en
pubs.notesArticle 961en
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group
pubs.publication-statusPublished onlineen
pubs.volume9en
dc.identifier.eissn2076-2615en
dc.rights.licenceAttributionen
lu.identifier.orcid0000-0002-7084-5223


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