Theses and Dissertations

Issuing Body

Mississippi State University


Wamsley, Kelley G. S.

Committee Member

Zhai, Wei

Committee Member

Kim, Elizabeth J.

Date of Degree


Document Type

Graduate Thesis - Open Access


Poultry Science

Degree Name

Master of Science (M.S.)


College of Agriculture and Life Sciences


Department of Poultry Science


Improvements to broiler production can be made through the means of nutrition and preventative health care. Formulating diets based on a digestible amino acid (AA) basis decreases feed cost and improves bird performance by providing a more accurate diet based on the bird’s specific production or age nutrient requirements. The apparent ileal amino acid digestibility (AIAAD) assay utilized in Experiment 1 demonstrated inconsistent results for age effects on AIAAD of an animal by-product blends for specific AA or age. Increasing pathogenic resistance and consumer’s push on the market, has caused integrators to incorporate alternative medications or inclusion strategies to coccidiosis management. Experiment 2 demonstrated diets containing virginiamycin, with an inclusion of salinomycin during d 14-28 only, decreased lesion scores and improved performance of birds receiving an increased dose of live coccidiosis vaccine. In Experiment 3, birds fed diets utilizing an ionophore regimen and additional algal beta-glucan demonstrated improved live performance.