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The effect of supplementation strategy, stress level, and tall fescue type on performance of fall-weaned beef calves

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dc.contributor.authorPickworth, Carrie Lynnen
dc.contributor.committeechairScaglia, Guillermoen
dc.contributor.committeememberFontenot, Joseph P.en
dc.contributor.committeememberSwecker, William S. Jr.en
dc.contributor.committeememberWahlberg, Mark L.en
dc.contributor.departmentAnimal and Poultry Sciencesen
dc.date.accessioned2014-03-14T21:41:50Zen
dc.date.adate2005-08-17en
dc.date.available2014-03-14T21:41:50Zen
dc.date.issued2005-06-20en
dc.date.rdate2005-08-17en
dc.date.sdate2005-08-01en
dc.description.abstractThe beef cattle marketing structure imposes stress on calves due to weaning, transport, commingling, and adaptation to new diets, resulting in a weakened immune systems at the height of disease risk, frequently causing bovine respiratory disease. Backgrounding programs facilitate opportunities for calves to overcome stressors by building immunity, and adapting the rumen to high concentrate diets for improved feedlot performance. Four experiments were conducted to compare backgrounding strategies and effects of supplementation frequency performance and the effects of the ruminal environment. In Exp. 1, 48 weaned steers were used to investigate the effects of transportation and supplementation frequency, while in Exp. 2, 36 heifers were used to investigate only supplementation frequency. No differences in gains were observed due to transportation stress or supplementation frequency. Weaning stress resulted in elevated (P < 0.05) creatine kinase and neutrophil:lymphocyte ratios during the first week. In Exp. 3, 48 calves were used to compare the effect of tall fescue type on performance and health. Calves on novel endophyte fescue had higher ADG (P = 0.07) than on endophyte-infected fescue. Experiment 4 investigated the changes in ruminal environment due to supplementation frequency. No differences were observed between supplementation frequencies for ruminal pH, ammonia, or VFA concentration, and DM, or CP digestibility. Therefore, the rumen maintained a hospitable environment to promote bacterial protein synthesis and fiber digestion with every 48 h supplementation. Backgrounding calves with high fiber co-product supplements or on novel endophyte fescue can enhance calf performance.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08012005-112346en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08012005-112346/en
dc.identifier.urihttp://hdl.handle.net/10919/44031en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartTHESIS.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcalvesen
dc.subjectstressen
dc.subjecttall fescueen
dc.subjectsupplementationen
dc.subjectweaningen
dc.subjectbackgroundingen
dc.titleThe effect of supplementation strategy, stress level, and tall fescue type on performance of fall-weaned beef calvesen
dc.typeThesisen
thesis.degree.disciplineAnimal and Poultry Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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