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Animal agriculture is recognized as an important source of pollutant and greenhouse gas (GHG) emissions. It is important to measure GHG emissions in animal feeding operations (AFOs) to compile emission inventories and to develop source-specific abatement strategies. There is global interest in quantifying and mitigating GHG (e.g., methane-CH4, nitrous oxide-N2O, and carbon dioxide-CO2) emissions from AFOs. In this study gaseous flux from the pen surfaces was generated and collected using a custom made wind tunnel at different times of the year (fall, summer, and spring). Air samples were drawn in the Tedlar bags using a vacuum chamber and analyzed for GHGs with a gas chromatograph (GC) within 24 hours of collection. The CH4 concentrations and emission fluxes among the sampling periods were not significantly different. Averaged CH4, CO2, and N2O concentrations were 2.66, 452, and 0.67 ppm, respectively. Estimated overall CH4, CO2, and N2O emission fluxes were 1.32, 602, 0.90 g d-1m-2, respectively. Overall ERs estimated using wind tunnel was 38, 17, and 26 g d-1 hd-1 for CH4, CO2 and N2O, respectively.