Replacing urea with nitrate as a non-protein nitrogen source increases lambs' growth and reduces methane production, whereas acacia tannin has no effectReplacing urea with nitrate as a non-protein nitrogen source increases lambs' growth and reduces methane production, whereas acacia tannin has no effect

dc.contributor.authorAdejoro, Festus Adeyemi
dc.contributor.authorHassen, Abubeker
dc.contributor.authorAkanmu, Abiodun Mayowa
dc.contributor.authorMorgavi, Diego P.
dc.contributor.emailabubeker.hassen@up.ac.zaen_ZA
dc.date.accessioned2020-04-12T07:32:29Z
dc.date.issued2020-01
dc.description.abstractThis study investigated the effect of urea or calcium nitrate with or without the inclusion of Acacia tannin extract on dry matter intake, nutrient digestibility, growth performance, and methane emission in growing lambs. Forty South African Mutton Merino lambs (95 days old, average body weight of 34.7 kg) were blocked by weight and sex and randomly allocated to four groups and fed diets supplemented with: urea (control); nitrate; urea + tannin; and nitrate + tannin. The concentration of urea and nitrate source in the diet was 10 g/kg and 32 g/kg, respectively, while the tannin was an extract of Acacia mearnsii added at 42 g/kg DM. Lambs were gradually adapted to the diets for 21 days after which growth performance was monitored for 60 days. At the end of the experimental period, methane was measured in open-circuit respiratory chambers, and digestibility was carried out inside metabolic cages. Dry matter and other nutrient intakes of lambs were not influenced by NPN source or the inclusion of tannin extract in the diet with the exception of the crude protein intake, which was higher (P ≤ 0.05) in lambs receiving urea-containing diets. Tannin inclusion reduced (P < 0.05) digestibility of dry matter, crude protein, neutral detergent fibre and acid detergent fibre of diets but did not affect methane emission of lambs. Tannin inclusion shifted N-excretion from urinary-N to faecal-N although overall N-retention was not affected. Tannin inclusion reduced acetate and increased propionate proportion in the urea-containing diet (P < 0.01), whereas, it had no such effect in the nitrate-containing diet. Higher (P ≤ 0.05) average daily gain and lower methane emission (P < 0.01) were recorded in lambs fed the nitrate-containing diets. In contrast, the inclusion of tannin reduced (P < 0.05) the average daily gain without any reduction in methane production. This study demonstrated that nitrate could be used as a source of non-protein nitrogen with the additional benefit of reducing enteric methane emission and improving the average daily gain of lambs. In contrast, tannin extract did not show any positive effect to justify its use under the dietary conditions of this study.en_ZA
dc.description.departmentAnimal and Wildlife Sciencesen_ZA
dc.description.embargo2021-01-01
dc.description.librarianhj2020en_ZA
dc.description.sponsorshipThe Department of Science and Technology (DS&T) and the National Research Foundation (NRF), South Africa (Grant No: 118518). An additional support to the first author was provided in the form of Early Career Research Leader Fellowship by the Carnegie Corporation of New York under the auspices of the Future Africa Institute at the University of Pretoria.en_ZA
dc.description.urihttp://www.elsevier.com/locate/anifeedscien_ZA
dc.identifier.citationAdejoro, F.A., Hassen, A., Akanmu, A.M. et al. 2020, 'Replacing urea with nitrate as a non-protein nitrogen source increases lambs' growth and reduces methane production, whereas acacia tannin has no effect', Animal Feed Science and Technology, vol. 259, art. 114360, pp. 1-9.en_ZA
dc.identifier.issn0377-8401 (print)
dc.identifier.issn1873-2216 (online)
dc.identifier.other10.1016/j.anifeedsci.2019.114360
dc.identifier.urihttp://hdl.handle.net/2263/74125
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2019 Published by Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Animal Feed Science and Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Animal Feed Science and Technology, vol. 259, art. 114360, pp. 1-9, 2020. doi : 10.1016/j.anifeedsci.2019.114360.en_ZA
dc.subjectEnteric methaneen_ZA
dc.subjectGrowth performanceen_ZA
dc.subjectNitrateen_ZA
dc.subjectNon-protein nitrogenen_ZA
dc.subjectRumen fermentationen_ZA
dc.subjectTanninen_ZA
dc.titleReplacing urea with nitrate as a non-protein nitrogen source increases lambs' growth and reduces methane production, whereas acacia tannin has no effectReplacing urea with nitrate as a non-protein nitrogen source increases lambs' growth and reduces methane production, whereas acacia tannin has no effecten_ZA
dc.typePostprint Articleen_ZA

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