Evaluation of Different Probiotic Strains Supplemented in Commercial Broiler Rations and their Influences on Performance, Yield, and Intestinal Microbiota.

<p>The objective of this study was to evaluate <em>Bacillus megaterium</em>, <em>Bacillus licheniformis</em>, and <em>Bacillus subtilis</em>, 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: <em>Bacillus licheniformus, Bacillus subtilis</em>, and BMD with Maxiban in the starter and grower diets as the coccidiostat, performed better overall compared to the negative and positive control treatments.</p>

Name thesis:degree_name

Master of Science - Agriculture

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Agriculture

Year dc:date.available

2017

Author dc:creator

• Glasscock, Justin M

Contributors dc:contributor

• Dr. Joey Bray
• Dr. Dale Perritt
• Dr. John Michael Mehaffey

• Probiotics
• Competetive Exclusion
• Antibiotic Growth Promotors
• Pyrosequencing
• Stress Related Bacteria
• Disease Prevention
• Biochemistry
• Biosecurity
• Food Processing
• Meat Science
• Molecular Biology
• Poultry or Avian Science

Repository record dc:identifier

https://scholarworks.sfasu.edu/etds/100

OAI identifier oai:identifier

oai:scholarworks.sfasu.edu:etds-1107