Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Brandi B. Karisch

Committee Member

Joshua G. Maples

Committee Member

Amelia R. Woolums

Committee Member

Trent Smith

Date of Degree

8-6-2021

Original embargo terms

Visible to MSU only for 1 year

Document Type

Graduate Thesis - Open Access

Major

Agriculture

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Animal and Dairy Sciences

Abstract

The objectives of this study were to evaluate the effect of number of stocker cattle in receiving pens (large: n=150 cattle; small: n=50 cattle) on 1) BRD morbidity/mortality, and performance, 2) antimicrobial use and prevalence of antimicrobial resistance in Mannheimia haemolytica, and 3) profitability of stocker operations. No differences were found for morbidity (p=0.5041). Mortality tended (p=0.0744) to be higher in large groups. BW increased (p LESS THAN 0.0001) over time. A treatment*day interaction (p=0.00592) was found for ADG, with largest gains for both groups from day 14-28. M. haemolytica recovery decreased (p=0.0002) over time. Antimicrobial resistance (p=0.0179) and MDR (p=0.0405) were higher in the small group. Treatment costs were higher in the small group ($1,093.53/hd) compared to large ($1,037.04/hd). Because of the nature of a pilot study, further research are needed to determine the effectiveness of reducing animals in a pen on health, growth, AMR, and profitability associated with stocker cattle.

Sponsorship

MULTISTATE PROJECT NUMBER W2010 CRIS PROJECT NUMBER MIS-331500 DEPARTMENT ORG 011300

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