Purine excretion and estimated microbial protein yield in sheep fed diets differing in protein degradability

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dc.contributor.authorWebster, AJF
dc.contributor.authorKaya, S
dc.contributor.authorDjouvinov, DS
dc.contributor.authorKitcherside, MA
dc.contributor.authorGlen, EF
dc.date.accessioned2024-09-18T20:55:52Z
dc.date.available2024-09-18T20:55:52Z
dc.date.issued2003
dc.departmentHatay Mustafa Kemal Üniversitesien_US
dc.description.abstractThe greatest sources of uncertainty concerning the application of the metabolizable protein (MP) system for ruminant feeding concern assumptions as to the extent and efficiency of synthesis of microbial protein (MiN) both from quickly, slowly and undegraded forms of dietary nitrogen (QDN, SDN and DUN, respectively) and from recycled endogenous nitrogen. In order to test these assumptions 12 castrated male lambs were allocated to three experimental semi-synthetic diets, QNF1.3, SNF1.3 and UNF0.8, formulated to provide different ratios of total dietary N to fermentable energy (FME) and to vary the proportions of total N provided by QDN, SDN and DUN. Thus, QNF1.3 and SNF1.3 were formulated to provide the same nominal ratio of 1.3 g degradable N/MJ FME. UNF0.8 was formulated to provide a similar total N concentration to QNF1.3 but with the majority of N in the form of DUN thus providing only 0.8 g degradable N/MJ FME. The diets were fed at two levels (maintenance and twice maintenance) according to a balanced changeover design. The two principal sources of dietary N were dark corn grains-plus-solubles (high QDN) and corn gluten meal (high DUN). MiN yield was estimated from urinary excretion of total purines. The net efficiency of incorporation of dietary N into MiN was estimated from increments of purine excretion between the two diet levels. Mean values for purine excretion from sheep were similar when the three diets were fed at the low, maintenance level. The net efficiencies of utilization of increments of 'effective rumen degradable nitrogen' (ERDN = 0.8QDN + SDN) between maintenance and twice maintenance were QNF1.3 = 0.50, SNF1.3 = 0.94 and UNF0.8 = 0.59. The value of 0.94 for diet SNF1.3 provides strong support for the assumption that the efficiency of capture of SDN can approach 1.0. The low (0.50) net efficiency of capture of increments of ERDN from diet QNF1.3 suggests the MP system is overoptimistic in assuming that QDN can be captured with an efficiency of 0.8. When diet UNF0.8 was fed at the high level, 6/8 sheep failed to sustain food intake presumably because they were unable to sustain the microbial population of the rumen. This suggests that the capacity of sheep to recycle endogenous N into MiN may not exceed the maximum amount permitted by the assumption of the MP system even when DUN is fed in excess of requirement for growth. (C) 2003 Elsevier Science B.V. All rights reserved.en_US
dc.identifier.doi10.1016/S0377-8401(03)00051-8
dc.identifier.endpage134en_US
dc.identifier.issn0377-8401
dc.identifier.issue1-4en_US
dc.identifier.scopus2-s2.0-0037474939en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage123en_US
dc.identifier.urihttps://doi.org/10.1016/S0377-8401(03)00051-8
dc.identifier.urihttps://hdl.handle.net/20.500.12483/12086
dc.identifier.volume105en_US
dc.identifier.wosWOS:000182383100012en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Science Bven_US
dc.relation.ispartofAnimal Feed Science and Technologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectrumen degradable Nen_US
dc.subjectpurine excretionen_US
dc.subjectmicrobial protein synthesisen_US
dc.titlePurine excretion and estimated microbial protein yield in sheep fed diets differing in protein degradabilityen_US
dc.typeArticleen_US

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