Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/10843
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dc.contributor.authorLi, Lien
dc.contributor.authorDavis, Jenniferen
dc.contributor.authorNolan, John Ven
dc.contributor.authorHegarty, Rogeren
dc.date.accessioned2012-07-26T15:27:00Z-
dc.date.issued2012-
dc.identifier.citationAnimal Production Science, 52(6 & 7), p. 653-658en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/10843-
dc.description.abstractThe effects of dietary nitrate and of urea on rumen fermentation pattern and enteric methane production were investigated using 4-month-old ewe lambs. Ten lambs were allocated into two groups (n = 5) and each group was offered one of two isonitrogenous and isoenergetic diets containing either 1.5% urea (T1) or 3% calcium nitrate (T2). Methane production was estimated using open-circuit respiration chambers after 6 weeks of feeding. No difference in nitrogen (N) balance, apparent digestibility of N or microbial N outflow existed between treatments (P> 0.05). Animals offered the T2 diet lost less energy through methane than did those fed the T1 diet (P < 0.05). Total volatile fatty acid concentration, molar proportion of propionate, and the molar ratio of acetate to propionate in rumen fluid were not affected by dietary N source. Compared with urea inclusion, nitrate inclusion caused a significantly higher acetate and lower butyrate percentage in rumen volatile fatty acid. Nitrate supplementation tended to lower methane production by ~7.7 L/day relative to urea supplementation (P = 0.06). Methane yield (L/kg DM intake) was reduced (P < 0.05) by 35.4% when 1.5% urea was replaced by 3% calcium nitrate in the diet. Emission intensity (L methane/kg liveweight gain) was ~17.3% lower in the nitrate-supplemented sheep when compared with urea-fed sheep; however, the reduction was not statistically significant (P > 0.05). This study confirms that the presence of nitrate in the diet inhibits enteric methane production. As no clinical symptoms of nitrite toxicity were observed and sheep receiving nitrate-supplemented diet had similar growth to those consuming urea-supplemented diet, it is concluded that 3% calcium nitrate can replace 1.5% urea as a means of meeting ruminal N requirements and of reducing enteric methane emissions from sheep, provided animals are acclimated to nitrate gradually.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleAn initial investigation on rumen fermentation pattern and methane emission of sheep offered diets containing urea or nitrate as the nitrogen sourceen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AN11254en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameLien
local.contributor.firstnameJenniferen
local.contributor.firstnameJohn Ven
local.contributor.firstnameRogeren
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008839802 Management of Greenhouse Gas Emissions from Animal Productionen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emaillli9@une.edu.auen
local.profile.emailjnolan@une.edu.auen
local.profile.emailrhegart3@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20120504-170737en
local.publisher.placeAustraliaen
local.format.startpage653en
local.format.endpage658en
local.identifier.scopusid84861826211en
local.peerreviewedYesen
local.identifier.volume52en
local.identifier.issue6 & 7en
local.contributor.lastnameLien
local.contributor.lastnameDavisen
local.contributor.lastnameNolanen
local.contributor.lastnameHegartyen
dc.identifier.staffune-id:lli9en
dc.identifier.staffune-id:jnolanen
dc.identifier.staffune-id:rhegart3en
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:11038en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleAn initial investigation on rumen fermentation pattern and methane emission of sheep offered diets containing urea or nitrate as the nitrogen sourceen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorLi, Lien
local.search.authorDavis, Jenniferen
local.search.authorNolan, John Ven
local.search.authorHegarty, Rogeren
local.uneassociationUnknownen
local.year.published2012en
local.subject.for2020300303 Animal nutritionen
local.subject.seo2020190302 Management of greenhouse gas emissions from animal productionen
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