Theses and Dissertations


Sabin Poudel

Issuing Body

Mississippi State University


Zhai, Wei

Committee Member

Tabler, George Thomas

Committee Member

Li, Zhang

Date of Degree


Original embargo terms

Visible to MSU only for 1 Year

Document Type

Graduate Thesis - Open Access


Agricultural Science

Degree Name

Master of Science


College of Agriculture and Life Sciences


Department of Poultry Science


The effects of supplementation of riboflavin along with Bacillus subtilis was investigated on growth performance and intestinal health of broilers under coccidial challenge. Treatments are 3 × 2 × 2 factorial arrangement, which includes 3 levels of riboflavin (0.75, 6.6 (recommended), and 20 ppm), with or without Bacillus subtilis, and with or without coccidial challenge. Coccidial challenge impaired the intestinal morphology and reduced body weight (BW), body weight gain (BWG), and feed intake and increased FCR between d 14-28. However, the cocci impact on birds was reduced along with age, as the effects on internal organs was reduced, which allowed birds to recover. However, coccidiosis reduced overall BW and BWG and increased abdominal fat pad weight and slight woody breast incidence. In conclusion, riboflavin at tested level was unable to enhance growth performance and intestinal health, but its inclusion altered birds response to coccidial challege other than feeding Bacillus subtlis alone.



This publication is a contribution of the Mississippi Agricultural and Forestry Experiment Station. This material is based upon work that is supported by the National Institute of Food and Agriculture (NIFA), U.S. Department of Agriculture, Hatch project under accession number MIS-329250, and by NIFA Award N0. 2018-67015-27475.