The study measured real time methane emissions from commercial dairy, turkey, and pig production barns in the Midwest. When expressed on a gram of CH4 per day per animal unit (AU= 500 kg) or g/d/AU basis, the results from this study compared well with data reported in the literature. A methane emission average of 220 g/d/AU was found for two dairy barns during nearly 6 month of sampling compared to values of 275 to 320 reported in previous work. The limited data for methane emissions collected in a pig barn was equal to a mean of 120 g/d/AU while literature values for a similar type of pig building (slatted floor with manure storage) varied from 70 to 190. Only the turkey CH4 emission data found in this study (average of 40 g/d/AU) did not compare to previous research (no methane emissions in a broiler house with very dry litter conditions).