Effect of varying levels of neutral detergent fiber and total digestible nutrients on dry matter intake of dairy heifers

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dc.contributor.authorTomlinson, Dana J.en
dc.contributor.committeechairJames, Robert E.en
dc.contributor.committeememberMcGilliard, Michael L.en
dc.contributor.committeememberStallings, Charles C.en
dc.contributor.committeememberVinson, William E.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2014-03-14T21:38:28Zen
dc.date.adate2012-06-12en
dc.date.available2014-03-14T21:38:28Zen
dc.date.issued1988-05-12en
dc.date.rdate2012-06-12en
dc.date.sdate2012-06-12en
dc.description.abstractOne hundred and eight Holstein dairy heifers were divided into two weight blocks based on beginning body weight (E = < 182 kg, light, > 270 kg, heavy). Heifers within weight blocks were randomly assigned to one of five treatments. Treatments consisted of three levels of NDF (35%, 45%, 55%) at 100% ofNRC TDN recommendation, and three levels of TDN (85%, 100%, 115 of NRC) at 45% NDF for light heifers. For heavy heifers, treatments consisted of three levels of NDF (40%, 50%, 60%) at 100% NRC TDN, and three treatments with similar levels of TDN at 50% NDF. Heifers were fed total mixed rations of corn silage, alfalfa haylage, ground orchardgrass hay, soybean meal, high moisture corn and a mineral mix formulated for 0.68 kg ADG. Mean gains (kg/d) were 1.07 and .96 for the light and heavy blocks, respectively. DMI as a percent of BWT differed across NDF levels for light heifers (3r'= 2.96, 2.56, 2.57, 2.57, and 2.87 % of BWT for the low, med., high NDF, and low, high TDN treatments, respectively). Heavy heifer DMI% did not differ (.Â¥= 2.45, 2.40, 2.24, 2.15, and 2.42 % ofBWT for low, med., and high NDF, and low, high TDN treatments, respectively). Equations to predict DMI were developed using intake information from this and a previous study. Backward stepwise regression was utilized to generate a simplified model. Model selected was: DMI (kg/d) = -5.9781 + (2.2120E-05 * BWTSQ) - (5.5527 * GAIN) + (2.7837 * GAINSQ) + (0.4668 * NDF) + (5.3930 * NDFSQ) + (0.03285 * DM) + 1 (7.7859E-03 * BWT * GAIN);11 = 514, rz = .67.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 151 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06122012-040012en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06122012-040012/en
dc.identifier.urihttp://hdl.handle.net/10919/43297en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.T654.pdfen
dc.relation.isformatofOCLC# 18354370en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.T654en
dc.subject.lcshDairy cattle -- Feeding and feedsen
dc.subject.lcshHeifers -- Feeding and feedsen
dc.titleEffect of varying levels of neutral detergent fiber and total digestible nutrients on dry matter intake of dairy heifersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineDairy Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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