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dc.contributor.authorLamb, J. B.
dc.contributor.authorAdams, D. C.
dc.contributor.authorKlopfenstein, T. J.
dc.contributor.authorGrant, R. J.
dc.contributor.authorSims, P. L.
dc.contributor.authorWhite, L. M.
dc.contributor.authorWaller, S. S.
dc.date.accessioned2020-09-18T04:57:50Z
dc.date.available2020-09-18T04:57:50Z
dc.date.issued2002-01-01
dc.identifier.citationLamb, J. B., Adams, D. C., Klopfenstein, T. J., Grant, R. J., Sims, P. L., White, L. M., & Waller, S. S. (2002). Intake and digestive kinetics of leaf and stem fractions. Journal of Range Management, 55(1), 57-64.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/4003263
dc.identifier.doi10.2458/azu_jrm_v55i1_lamb
dc.identifier.urihttp://hdl.handle.net/10150/643625
dc.description.abstractRuminally fistulated steers were used in a 4 x 4 Latin square to test effects of immature (vegetative) and mature (post reproductive) leaf and stem fractions from subirrigated meadow hay on organic matter intake (OMI), organic matter digestibility (OMD), and digestive kinetics. Hay was harvested 1 June (immature) and 1 October (mature), chopped into 3- to 5-cm lengths, then separated into leaf and stem fractions using a modified Clipper Cleaner Model Super 69D. Steers were provided ad libitum access to fractions and supplemented with urea so that diets were iso-nitrogenous. Particulate passage was determined using Yb labeled large hay particles [greater than or equal to 1.7-mm screen] and Er labeled small particles [< 1.7-mm and greater than or equal to 0.212-mm screen]. Samples were collected from the rumen, omasum, feces, and un-masticated diets for particle size determination. Particle size was determined using wet sieving techniques. Voluntary OMI of immature fractions (15.4 g kg(-1) BW) was greater (P < 0.05) than mature fractions (12.5 g kg(-1) BW). Within maturity OMI and OMD of leaves and stems were similar. Immature fractions had greater (P < 0.05) OMD (63.2%) than mature fractions (55.7%). Large and small particle passage rates were faster (P < 0.05) for immature fractions [3.2% hour(-1) (large) and 4.3% hour(-1) (small)] than mature [(2.3% hour(-1) (large) and 2.9% hour(-1) (small)]. Critical particle size for ruminal escape was less than or equal to 1.18 mm for both leaves and stems regardless of maturity. Differences in OMI and OMD between immature and mature fractions were explained by changes in structural components of the cell wall that made particles more resistant to mechanical and microbial breakdown.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectrumen
dc.subjectparticle size
dc.subjectorganic matter
dc.subjectleaves
dc.subjectash
dc.subjectstems
dc.subjectcutting date
dc.subjectfiber content
dc.subjectvoluntary intake
dc.subjectNebraska
dc.subjecthay
dc.subjectsteers
dc.subjectdigestibility
dc.subjectcrude protein
dc.subjectpH
dc.subjecttransit time
dc.subjectbeef cattle
dc.subjectfeed intake
dc.subjectmaturity stage
dc.subjectdigestibility
dc.subjectretention
dc.subjectparticle size
dc.subjectrumen
dc.subjectfeces
dc.subjectomasum
dc.titleIntake and digestive kinetics of leaf and stem fractions
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.collectioninformationThe Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume55
dc.source.issue1
dc.source.beginpage57-64
refterms.dateFOA2020-09-18T04:57:51Z


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