Date of Award
Master of Science - Agriculture
Dr. Joey Bray
Dr. Dale Perritt
Dr. John Michael Mehaffey
Dr. Karen Embry-Jenlink
The objective of this study was to evaluate Bacillus megaterium, Bacillus licheniformis, and Bacillus subtilis, as probiotic strains compared to Bacitracin Methylene Disalicylate (BMD) 50 as the antibiotic growth promotor, supplemented in commercial broiler rations and their influences on performance, yield, and intestinal microbiota. This trial was completed as a randomized-block design with 4,800 birds split into 96, 5’x10’ pens, and randomly assigned to one of eight treatment groups. The birds were placed at a stocking density of 1.00 ft2/bird, (50 birds/pen), and reared on used pine shaving for 55 days. Throughout the study, bird performance, and intestine samples were measured. A yield study was completed at the end of the study to determine meat yield for all retail cuts. Results show treatment 3, (LS + AGP), which consisted of the following probiotics and antibiotic growth promotors: Bacillus licheniformus, Bacillus subtilis, and BMD with Maxiban in the starter and grower diets as the coccidiostat, performed better overall compared to the negative and positive control treatments.
Glasscock, Justin M., "Evaluation of Different Probiotic Strains Supplemented in Commercial Broiler Rations and their Influences on Performance, Yield, and Intestinal Microbiota." (2017). Electronic Theses and Dissertations. 100.
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