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https://hdl.handle.net/1959.11/23274
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DC Field | Value | Language |
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dc.contributor.author | Hettiarachchi, M | en |
dc.contributor.author | Dixon, R M | en |
dc.contributor.author | Nolan, John V | en |
dc.date.accessioned | 2018-06-15T14:06:00Z | - |
dc.date.issued | 1999 | - |
dc.identifier.citation | The Journal of Agricultural Science, v.133, p. 109-121 | en |
dc.identifier.issn | 1469-5146 | en |
dc.identifier.issn | 0021-8596 | en |
dc.identifier.uri | https://hdl.handle.net/1959.11/23274 | - |
dc.description.abstract | Sixteen sheep were continuously fed diets based on straw, straw and barley grain, or NaOH-treated straw, each with adequate minerals and with or without additional urea (7.3 g N/day for the straw and straw and barley diets; 14-4 g N/day for the diet containing NaOH-treated straw) infused intra-ruminally. [14C] tracers were used to measure the rate of irreversible loss (i.e. synthesis) of plasma urea and its transfer to the rumen and to the remainder of the gastrointestinal tract in 4-6 sheep per treatment. [15N] tracers were also used to make these measurements in four sheep fed the straw, straw and barley and straw and barley with intra-ruminal urea infusions. Inclusion of the barley grain in the diet increased digestible organic matter intake by c. 70%. Replacing the straw with a greater amount of NaOH-treated straw increased digestible organic matter intake by 43 % in the absence of additional urea, and by 65% when urea was infused intra-ruminally. Rumen ammonia concentrations were 37 and 31 mg N/l when straw or straw and barley diets respectively were provided and were reduced to 3 mg N/l when treated straw was given to the sheep. These concentrations exceeded 223 mg N/l when urea was infused intra-ruminally. Rate of irreversible loss of plasma urea measured using [14C]urea ranged from 3.7 g N/day in sheep given the treated straw diet to 16.8 g N/day when urea was infused intra-ruminally, while this rate was correlated with plasma urea concentration. In the three diets where it was measured, rate of irreversible loss of [15N]urea was on average 0.73 of the rate of irreversible loss of [14C]urea. Measurements made with 14C and 15N tracers of plasma urea transfer to the rumen were similar. This transfer measured with 14C tracers ranged from 1-4 to 2.4 g N/day for the three diets without additional urea, while providing urea by intra-ruminal infusions reduced the transfer to 1.1-1.4 g N/day. Transfer of plasma urea to the rumen was not changed by the higher digestible organic matter intake associated with either inclusion of barley grain in the diet or provision of a greater amount of more highly digestible NaOH-treated straw. These studies indicate that plasma urea transfer to the rumen is not always increased by greater organic matter fermentation in the rumen. | en |
dc.language | en | en |
dc.publisher | Cambridge University Press | en |
dc.relation.ispartof | The Journal of Agricultural Science | en |
dc.title | Effect of intra-ruminal urea infusions and changing digestible organic intake on nitrogen kinetics in sheep fed rice straw | en |
dc.type | Journal Article | en |
dc.identifier.doi | 10.1017/S0021859699006590 | en |
dc.subject.keywords | Animal Nutrition | en |
local.contributor.firstname | M | en |
local.contributor.firstname | R M | en |
local.contributor.firstname | John V | en |
local.subject.for2008 | 070204 Animal Nutrition | en |
local.subject.seo2008 | 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences | en |
local.profile.school | School of Environmental and Rural Science | en |
local.profile.email | jnolan@une.edu.au | en |
local.output.category | C1 | en |
local.record.place | au | en |
local.record.institution | University of New England | en |
local.identifier.epublicationsrecord | une-chute-20170729-174326 | en |
local.publisher.place | United Kingdom | en |
local.format.startpage | 109 | en |
local.format.endpage | 121 | en |
local.identifier.scopusid | 0032877429 | en |
local.peerreviewed | Yes | en |
local.identifier.volume | 133 | en |
local.contributor.lastname | Hettiarachchi | en |
local.contributor.lastname | Dixon | en |
local.contributor.lastname | Nolan | en |
dc.identifier.staff | une-id:jnolan | en |
local.profile.orcid | 0000-0001-7949-950X | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.identifier.unepublicationid | une:23456 | en |
local.identifier.handle | https://hdl.handle.net/1959.11/23274 | en |
dc.identifier.academiclevel | Academic | en |
local.title.maintitle | Effect of intra-ruminal urea infusions and changing digestible organic intake on nitrogen kinetics in sheep fed rice straw | en |
local.output.categorydescription | C1 Refereed Article in a Scholarly Journal | en |
local.search.author | Hettiarachchi, M | en |
local.search.author | Dixon, R M | en |
local.search.author | Nolan, John V | en |
local.uneassociation | Unknown | en |
local.year.published | 1999 | en |
Appears in Collections: | Journal Article |
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