Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/7620
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dc.contributor.authorLines, Daviden
dc.contributor.authorGoopy, John Patricken
dc.contributor.authorNolan, John Ven
dc.date.accessioned2011-06-03T09:49:00Z
dc.date.issued2010en
dc.identifier.citationProceedings of the Australian Society of Animal Production 28th Biennial Conference, v.28, p. 62-62en
dc.identifier.urihttps://hdl.handle.net/1959.11/7620en
dc.description.abstractIncreasing interest in reducing emission of the greenhouse gas methane from ruminants has lead to a need for reliable and accurate determination of the daily methane production (DMP) phenotype in ruminants. Twenty-four hour direct calorimetry is generally considered to give an accurate measurement of DMP. However, single measurements, while accurate on the day, does not account for day-to-day intra-animal variability in determination of DMP phenotype. This paper draws on the results of a large body of data (Blaxter and Clapperton, 1965) to estimate the number of measurements needed to discern real differences in the DMP phenotype with varying levels of confidence. Blaxter and Clapperton's (1965) results from 989 individual 24h CH₄ (sheep and cattle) determinations, indicated a day-to-day CV within animals of 7.2%. Using this value we calculated the number of measurements required to detect a varying degrees of difference at different confidence levels from a t-distribution. Figure 1 presents estimates of the number of measures required to detect an expected difference between individual animals at 3 levels of confidence. Increasing the number of DMP measurements will enable the detection of smaller differences in DMP between animals. ... Using a published CV of 7.2, it is clear that single measures of DMP are inadequate to characterise DMPs with a reasonable degree of confidence. We conclude that greater consideration needs to be given as to the number of measures required to adequately discern true differences in DMP phenotype.en
dc.languageenen
dc.publisherASAP: Australian Society of Animal Productionen
dc.relation.ispartofProceedings of the Australian Society of Animal Production 28th Biennial Conferenceen
dc.titleHow Often Do We Need to Measure Methane Production in Ruminants to Establish Robust Phenotype?en
dc.typeConference Publicationen
dc.relation.conferenceAustralian Society of Animal Production 28th Biennial Conference - Livestock Production in a Changing Environment, Armidale, Australia, 11th - 15th July, 2010en
dc.subject.keywordsAnimal Productionen
local.contributor.firstnameDaviden
local.contributor.firstnameJohn Patricken
local.contributor.firstnameJohn Ven
local.subject.for2008070299 Animal Production not elsewhere classifieden
local.subject.seo2008830399 Livestock Raising not elsewhere classifieden
local.profile.schoolEnvironmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolAdministrationen
local.profile.emaildlines2@une.edu.auen
local.profile.emailjgoopy2@une.edu.auen
local.profile.emailjnolan@une.edu.auen
local.output.categoryE3en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20110331-103319en
local.publisher.placeOnlineen
local.identifier.runningnumberPoster ID: 31en
local.format.startpage62en
local.format.endpage62en
local.identifier.volume28en
local.contributor.lastnameLinesen
local.contributor.lastnameGoopyen
local.contributor.lastnameNolanen
dc.identifier.staffune-id:dlines2en
dc.identifier.staffune-id:jgoopy2en
dc.identifier.staffune-id:jnolanen
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:7790en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleHow Often Do We Need to Measure Methane Production in Ruminants to Establish Robust Phenotype?en
local.output.categorydescriptionE3 Extract of Scholarly Conference Publicationen
local.relation.urlhttp://www.asap.asn.au/asap28/proceedings28.htmlen
local.relation.urlhttp://www.asap.asn.au/asap28/files/lines062.pdfen
local.conference.detailsAustralian Society of Animal Production 28th Biennial Conference - Livestock Production in a Changing Environment, Armidale, Australia, 11th - 15th July, 2010en
local.description.statisticsepubsVisitors: 68<br />Views: 67<br />Downloads: 0en
local.search.authorLines, Daviden
local.search.authorGoopy, John Patricken
local.search.authorNolan, John Ven
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