Theses and Dissertations

Joe O. Buntyn

Issuing Body

Mississippi State University

Advisor

Rivera, J. Daniel

Committee Member

Schmidt, Ty B.

Committee Member

Carroll, Jeffrey A.

Committee Member

Smith, Trent

Date of Degree

12-15-2012

Document Type

Graduate Thesis - Open Access

Major

Animal Nutrition

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Animal and Dairy Sciences

Abstract

Nineteen heifers (274 ± 24 kg) were blocked into two treatment groups based upon DNAm; heifers with no DNAm (noQG), and heifers with one or more DNAm (1+QG). Prior to challenge (24 h), heifers were fitted with indwelling jugular catheters and indwelling vaginal temperature (VT) monitoring devices. Blood samples were collected at 30-min intervals while RT were collected at 1-min intervals from -2 to 8 h relative to a lipopolysaccride (LPS) challenge (0.5 ìg/kg BW) at 0 h. Serum was analyzed for concentrations of cortisol and pro-inflammatory cytokines. All physical, endocrine, and immune measurements increased relative to LPS challenge. No differences observed for IL-6 or TNF-á; however, 1+QG heifers had a greater circulating INF-ã (P < 0.001). Furthermore, 1+QG heifers had an elevated VT (P = 0.04). This would suggest a different immune system approach to an LPS challenge.

URI

https://hdl.handle.net/11668/19076

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