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�- Dangerous Gases <br /> • Toxic gases in manure pits or silos <br /> present potential hazards to both humans <br /> 4D and animals . The four major gases found <br /> i <br /> 40 in manure pits include : <br /> 40 <br /> 4w 1 . Hydrogen Sulfide <br /> 40 <br /> .10 <br /> s <br /> 2 . Carbon Dioxide <br /> 3 . Ammonia <br /> 40 4 . Methane <br /> s <br /> s <br />