Four treatments were evaluated for their effect on emission of H2S of swine slurry stored in simulated beneath floor pits. The treatments were: (1) batch load without ventilation; (2) batch load with ventilation; (3) continuous load with ventilation; (4) continuous load with ventilation with added feed. These treatments were selected to simulate current housing conditions and to evaluate their effects on previous efforts to dentify systems which result in large quantities of H2S volatilization. Measurements for each treatment included: slurry temperature, pH, and gaseous H2S concentration before and after slurry mixing. Results demonstrate: (1) pH was lowest for Treatments 1 & 4; (2) agitation tended to reduce pH in all treatments; (3) slurry surface H2S volatilization fluxes was greatest for Treatment 4; (4) slurry surface H2S volatilization fluxes increased 21-27-fold upon agitation; and (5) maximum volatilization fluxes after agitation occurred over one week and were fairly constant. This work demonstrates an experimental research methodology to assess methods to reduce gaseous emissions from swine facilities, such as dietary manipulation and alternate ventilation strategies.