Effects of Stress on Several Immune and Health Responses of Weanling Calves

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dc.contributor.authorShank, Alba Maria Montanaen
dc.contributor.committeechairSwecker, William S. Jr.en
dc.contributor.committeememberEversole, Dan E.en
dc.contributor.committeememberFontenot, Joseph P.en
dc.contributor.committeememberSaker, Korinn E.en
dc.contributor.departmentVeterinary Medical Sciencesen
dc.date.accessioned2014-03-14T20:44:41Zen
dc.date.adate2002-09-19en
dc.date.available2014-03-14T20:44:41Zen
dc.date.issued2002-07-02en
dc.date.rdate2003-09-19en
dc.date.sdate2002-09-03en
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
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09032002-091440en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09032002-091440/en
dc.identifier.urihttp://hdl.handle.net/10919/34898en
dc.publisherVirginia Techen
dc.relation.haspartthesisfrontpages2.pdfen
dc.relation.haspartthesisbackup.pdfen
dc.relation.hasparttitlepagethesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectGlutatione peroxidaseen
dc.subjectWeaningen
dc.subjectSeleniumen
dc.subjectStressen
dc.subjectBovineen
dc.titleEffects of Stress on Several Immune and Health Responses of Weanling Calvesen
dc.typeThesisen
thesis.degree.disciplineVeterinary Medical Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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