Supplemental Selenium Source in Holstein Steers Challenged with Intranasal Bovine Infectious Rhinotracheitis Virus and in Newly Received Beef Heifers: Performance, Morbidity, Antibody Titers, and Blood Cell Counts

T. L. Covey, N. E. Elam, J. A. Carroll, D. B. Wester, M. L. Galyean

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Viral infection in newly received feedlot cattle can lead to oxidative stress. As a constituent of glutathione peroxidase, Se plays a vital antioxidant role. Our objective was to evaluate effects of Se source on the performance and health of calves challenged with infectious bovine rhinotracheitis virus (IBRV; Exp. 1) or in field conditions (Exp. 2). In Exp. 1, twenty-four Holstein steers (initial BW = 170 ± 0.6 kg) were given either 1) no supplemental Se (control), 2) 1 mg/steer daily of Se from Se-yeast, or 3) 5 mg/steer daily of Se from sodium selenite. Treatments were fed for 28 d before steers were inoculated with IBRV (d 0) and were continued 21 d after the challenge. Treatments did not affect BW or DMI (P > 0.20) from 7 d before through 21 d after the challenge. Supplemental Se (P = 0.02) increased IBRV titer values on d 21. The IBRV challenge induced a febrile response; however, there were no treatment differences (P > 0.10) in rectal temperature. Total red and white blood cell counts, percentage of white blood cell types, and hemoglobin concentrations did not differ (P = 0.11) among the 3 treatments. In Exp. 2, newly received, crossbred heifers (4 pens/treatment) were fed the same treatments as in Exp. 1, except selenite was supplied at 1 mg/heifer dailyfor 28 d. No treatment differences (P > 0.10) were observed for performance or health during Exp. 2. Results help to define the effects of Se supplementation and source on the immune response to viral infections in cattle.

Original languageEnglish
Pages (from-to)82-92
Number of pages11
JournalProfessional Animal Scientist
Volume26
Issue number1
DOIs
StatePublished - Feb 1 2010

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