Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/23195
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dc.contributor.authorHennessy, D Wen
dc.contributor.authorWilliamson, P Jen
dc.contributor.authorNolan, Johnen
dc.contributor.authorKempton, T Jen
dc.contributor.authorLeng, Ren
dc.date.accessioned2018-06-04T16:36:00Z-
dc.date.issued1983-
dc.identifier.citationThe Journal of Agricultural Science, 100(3), p. 657-666en
dc.identifier.issn1469-5146en
dc.identifier.issn0021-8596en
dc.identifier.urihttps://hdl.handle.net/1959.11/23195-
dc.description.abstractTwenty-seven Hereford weaner steers (mean age 11 months, and live weight 142 17 kg) were used to study the effect of supplementation of an energy-rich grain (sorghum), and/or a protein meal on the liveweight change of cattle on a basal diet of low-quality grass hay over 48 days (Expt 1). The basal hay had an estimated energy value of 6.2 MJ metabolizable energy (ME)/kg dry matter (d.m.) and a nitrogen content of 6.2 g/kg d.m. Corresponding values for the sorghum supplement were 12.4 and 14.4, and for the protein meal 9.6 and 65. The daily rates of supplementation in Expt 1 were (g/head) 0 (nil), 600 (P1) or 1200 (P2) of protein meal pellets or 0 (nil), 560 (S1) or 1120 (S2) of sorghum and all combinations of P1 or P2 with S1 or S2. The carry-over effect of such supplementation on subsequent growth was recorded in Expt 2 when the steers grazed a kikuyu grass pasture for 100 days. In Expt 1, organic-matter intake of hay (HOMI) was increased (P<0.01) by protein but decreased (P<0.01) by the sorghum supplements. By 48 days, P1-supplemented steers were eating 29.5 % more hay than non-supplemented steers, and P2 steers were eating 43.5% more hay than the non-supplemented steers. S1 supplemented steers were eating 29.5% less, and S2 steers 23% less hay than non-supplemented steers. Steers lost weight on the basal hay diet, and at the lower level of sorghum (S1) supplementation, but were able to maintain weight at the higher level (S2) of supplementation. In contrast, steers supplemented with protein gained weight (P<0.01): 430 g/day on P1 and 700 g/day on P2 treatments. None of the steers offered combinations of P and S had liveweight changes as high as those offered only protein supplements. There was no evidence of compensatory gain by the smaller steers in Expt 2 when grazing and unsupplemented. Glucose kinetics in plasma were studied in each steer on day 35 of Expt 1 by means of a single intravenous injection of [2-3H]glucose. The quantity of glucose in the sampled pool and the total rate of glucose entry into the pool (GER) were higher (P<0.01) in steers that were protein supplemented, with GER being related to both ME intake and to N intake per unit ME intake. Urea pool size and entry rate were also estimated on day 35 of Expt 1 using a single intravenous injection of [14C]urea. The quantity of urea in the sampled pool, and entry rate into the pool were increased significantly (P<0.01) by protein, but reduced (P<0.05) by sorghum, supplementation. Rumen ammonia concentrations were low in steers given the hay alone, and when supplemented with sorghum (10-15 mg N/1), but were significantly higher (70 mg N/1; P<0.01) during protein supplementation. It was concluded that growth of cattle on the basal ration was restricted by low voluntary intakes of hay. Intake was increased substantially by protein supplementation. The consequent increase in live weight was due to a greater intake of organic matter which was accompanied by a greater synthesis of glucose and availability of amino acids in the animals. We thank F. Ball, S. Stachiw, J. Cochrane, for skilled technical assistance and C. Perrin for care of the livestock. We are grateful to R. Murison, for statistical advice and to R. Baigent for gas liquid chromatography analysis.en
dc.languageenen
dc.publisherCambridge University Pressen
dc.relation.ispartofThe Journal of Agricultural Scienceen
dc.titleThe roles of energy- or protein-rich supplements in the subtropics for young cattle consuming basal diets that are low in digestible energy and proteinen
dc.typeJournal Articleen
dc.identifier.doi10.1017/S0021859600035437en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameD Wen
local.contributor.firstnameP Jen
local.contributor.firstnameJohnen
local.contributor.firstnameT Jen
local.contributor.firstnameRen
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008970107 Expanding Knowledge in the Agricultural and Veterinary Sciencesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailjnolan@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-chute-20170729-174340en
local.publisher.placeUnited Kingdomen
local.format.startpage657en
local.format.endpage666en
local.identifier.scopusid84971131117en
local.peerreviewedYesen
local.identifier.volume100en
local.identifier.issue3en
local.contributor.lastnameHennessyen
local.contributor.lastnameWilliamsonen
local.contributor.lastnameNolanen
local.contributor.lastnameKemptonen
local.contributor.lastnameLengen
dc.identifier.staffune-id:jnolanen
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:23379en
local.identifier.handlehttps://hdl.handle.net/1959.11/23195en
dc.identifier.academiclevelAcademicen
local.title.maintitleThe roles of energy- or protein-rich supplements in the subtropics for young cattle consuming basal diets that are low in digestible energy and proteinen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorHennessy, D Wen
local.search.authorWilliamson, P Jen
local.search.authorNolan, Johnen
local.search.authorKempton, T Jen
local.search.authorLeng, Ren
local.uneassociationUnknownen
local.year.published1983en
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