Theses and Dissertations

Issuing Body

Mississippi State University


Karisch, Brandi B.

Committee Member

Smith, David R.

Committee Member

Parish, Jane A.

Date of Degree


Document Type

Graduate Thesis - Open Access


Mechanical Engineering

Degree Name

Master of Science (M.S.)


James Worth Bagley College of Engineering


Department of Mechanical Engineering


The objectives of this study were to evaluate the effects of: (1) metaphylactic antibiotic administration (none or Excede on arrival); and (2) receiving diet crude protein levels (17.1 % or 11.9 % CP) on respiratory disease incidence, mortality, and growth performance of beef calves received into a stocker system as well as the influence of stocker treatment on feedlot and carcass performance. For the stocker phase, steers (n = 244) were stratified by BW and randomly assigned to 20 pens. Treatments were randomly assigned in a 2 x 2 factorial study design. At the conclusion of the stocker phase, 76 steers were sent to Tri County Steer Carcass Futurity in Lewis, IA. Metaphylactic treatment reduced the incidence of BRD and increasing CP in the receiving ration to 17.1 % resulted in greater ADG. Health, nutrition, and management during the stocker phase can impact feedlot and carcass performance.