Abstract
Eighty weanling beef calves were used to determine the effects of zinc and selenium supplementation on performance, immune response, and blood characteristics during stress. Treatments included: (1) control; (2) control diet with selenium injection [15 mg/hd (head)] (3) zinc diet (25 mg Zn/hd/d, added as ZnO); and (4) zinc diet with selenium injection. Feed intake and weight gains were not affected by zinc throughout the 28-d study. However, selenium improved weight gains in calves with low initial selenium status in the first 14 d of the study. Glutathione peroxidase (GSH-Px) was increased by selenium and decreased by zinc on d 19. Zinc appeared to interfere with the role of selenium in GSH-Px activity at the cellular level. Plasma zinc was not affected by treatment. Zinc supplementation resulted in increased serum sodium and decreased serum total protein and glutamic-oxaloacetic transaminase. Immune response was measured via antibody titers to Infectious Bovine Rhinotracheitis (IBR) and Para-influenza3 (PI3) viruses 19 d postvaccination. Levels of titers were not affected by either zinc or selenium, however, titers did reflect a response to vaccination between sampling dates. On d 19, zinc increased the percentage of leukocytes that were monocytes. Total leukocyte, neutrophil and lymphocyte numbers did not differ across treatments. These results suggest that selenium or zinc supplementation may individually improve an animal’s response to stress.
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Reffett, J.K., Spears, J.W., Hatch, P.A. et al. Influence of selenium and zinc on performance, blood constituents, and immune response in stressed calves. Biol Trace Elem Res 9, 139–149 (1986). https://doi.org/10.1007/BF02916522
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DOI: https://doi.org/10.1007/BF02916522