Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Zhai, Wei
Committee Member
Peebles, E. David
Committee Member
Macklin, Kenneth S.
Date of Degree
12-14-2018
Document Type
Graduate Thesis - Open Access
Major
Poultry Science
Degree Name
Master of Science
College
College of Agriculture and Life Sciences
Department
Department of Poultry Science
Abstract
The effects of dietary antimicrobial removal and Bacillus subtilis supplementation on the growth and intestinal health of male broilers were investigated. Birds were fed either a control, antimicrobial, or a B. subtilis probiotic diet at different feeding phases. Birds were challenged with a 10 × dose of a coccidiosis vaccine. Supplementation of B. subtilis in for antimicrobials in the late grower and early finisher phases improved growth similar to birds fed antimicrobials until withdrawal, while antimicrobial removal without B. subtilis supplementation in those periods hindered growth. The improved growth suggests that the probiotic was able to alleviate the stress of the challenge compared to antimicrobial removal. Processing yields were improved with antimicrobial removal and B. subtilis supplementation in late grower and early finisher phase. Intestinal health was improved with lower intestinal lesions when antimicrobial were removed and B. subtilis supplemented suggesting the reduction of Eimeria species from colonizing the intestine.
URI
https://hdl.handle.net/11668/20378
Recommended Citation
O'Donnell, Kacey, "Removal of Dietary Antimicrobials and Effects of their Replacement with Bacillus Subtilis on the Growth and Intestinal Health of Male Broilers" (2018). Theses and Dissertations. 3789.
https://scholarsjunction.msstate.edu/td/3789
Comments
Coccidiosis||Bacillus subtilis||Probiotic||Antibiotic||Broiler