Effects of Stress on Several Immune and Health Responses of Weanling Calves
The 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 pero...
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ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-348982020-09-26T05:37:55Z Effects of Stress on Several Immune and Health Responses of Weanling Calves Shank, Alba Maria Montana Veterinary Medical Sciences Swecker, William S. Jr. Eversole, Dan E. Fontenot, Joseph P. Saker, Korinn E. Glutatione peroxidase Weaning Selenium Stress Bovine The 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). Master of Science 2014-03-14T20:44:41Z 2014-03-14T20:44:41Z 2002-07-02 2002-09-03 2003-09-19 2002-09-19 Thesis etd-09032002-091440 http://hdl.handle.net/10919/34898 http://scholar.lib.vt.edu/theses/available/etd-09032002-091440/ thesisfrontpages2.pdf thesisbackup.pdf titlepagethesis.pdf In Copyright http://rightsstatements.org/vocab/InC/1.0/ application/pdf application/pdf application/pdf Virginia Tech |
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Glutatione peroxidase Weaning Selenium Stress Bovine |
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Glutatione peroxidase Weaning Selenium Stress Bovine Shank, Alba Maria Montana Effects of Stress on Several Immune and Health Responses of Weanling Calves |
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The 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). === Master of Science |
author2 |
Veterinary Medical Sciences |
author_facet |
Veterinary Medical Sciences Shank, Alba Maria Montana |
author |
Shank, Alba Maria Montana |
author_sort |
Shank, Alba Maria Montana |
title |
Effects of Stress on Several Immune and Health Responses of Weanling Calves |
title_short |
Effects of Stress on Several Immune and Health Responses of Weanling Calves |
title_full |
Effects of Stress on Several Immune and Health Responses of Weanling Calves |
title_fullStr |
Effects of Stress on Several Immune and Health Responses of Weanling Calves |
title_full_unstemmed |
Effects of Stress on Several Immune and Health Responses of Weanling Calves |
title_sort |
effects of stress on several immune and health responses of weanling calves |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/34898 http://scholar.lib.vt.edu/theses/available/etd-09032002-091440/ |
work_keys_str_mv |
AT shankalbamariamontana effectsofstressonseveralimmuneandhealthresponsesofweanlingcalves |
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1719342789257330688 |