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dc.contributor.authorShank, Alba Maria Montanaen_US
dc.date.accessioned2014-03-14T20:44:41Z
dc.date.available2014-03-14T20:44:41Z
dc.date.issued2002-07-02en_US
dc.identifier.otheretd-09032002-091440en_US
dc.identifier.urihttp://hdl.handle.net/10919/34898
dc.description.abstractThe effects of weaning stressors on several immune and health responses were measured in three experiments. Sixty-four beef calves from 2 sources were bled on d - 7 (pre-weaning), 0 (weaning), 7, 14, and 21 (post-weaning). Serum selenium (Se), neutrophil and lymphocyte counts, and glutathione peroxidase (GSH-Px) activity for erythrocytes and leukocytes were measured for each calf at each date. Erythrocyte GSH-Px activity remained constant over time, while leukocyte GSH-Px and serum Se increased on d 7 (P<0.0001). Effects of single mineral vs. multi-mineral supplementation were measured for several immune and health responses in 2 trials. Trial 1: 36 heifers weaned on-site at SVAREC were randomly assigned 1 of 2 dietary supplements: 1) no supplement; 2) 15% CP at 0.5% BW; and 1 of 3 injection treatments: 1) no treatment (control); 2) Mu-Se injection; 3) Multi-Min injection. Whole blood Se and serum Cu increased post-weaning and serum Zn decreased post-weaning. Mu-Se-supplemented heifers gained weight faster between d 14-28 vs. Multi-Min-supplemented (P=0.01) or control heifers (P=0.02). Trial 2: 48 steers purchased at auction and transported to SVAREC were randomly assigned to 1 of 4 pasture management systems: 1) control (no treatment); 2) litter fed; 3) litter applied; 4) inorganic fertilizer; and 1 of 3 injection treatments (same as Trial 1). Whole blood Se and serum Cu increased post-stress and serum Zn decreased post-stress. Oxidative burst activity decreased in Mu-Se and Multi-min supplemented steers between d 0-4 vs. control steers (P<0.01). Multi-min-supplemented steers had higher phagocytic activity vs. steers in either Mu-Se or control groups (P=0.04).en_US
dc.publisherVirginia Techen_US
dc.relation.haspartthesisfrontpages2.pdfen_US
dc.relation.haspartthesisbackup.pdfen_US
dc.relation.hasparttitlepagethesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectGlutatione peroxidaseen_US
dc.subjectWeaningen_US
dc.subjectSeleniumen_US
dc.subjectStressen_US
dc.subjectBovineen_US
dc.titleEffects of Stress on Several Immune and Health Responses of Weanling Calvesen_US
dc.typeThesisen_US
dc.contributor.departmentVeterinary Medical Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineVeterinary Medical Sciencesen_US
dc.contributor.committeechairSwecker, William S. Jr.en_US
dc.contributor.committeememberEversole, Dan E.en_US
dc.contributor.committeememberFontenot, Joseph P.en_US
dc.contributor.committeememberSaker, Korinn E.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09032002-091440/en_US
dc.date.sdate2002-09-03en_US
dc.date.rdate2003-09-19
dc.date.adate2002-09-19en_US


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