NOVELTY - Breeding room (1) has doors (16) to regulate pressure of exhaust line (5) supplying exhaust gas through duct (21) for fermentation and drying of excrement. Air blowers (7) in air intake line (6) introduces outer air for ventilation. A spraying nozzle (35) in the fermentation room forms water curtain (W) near exhaust port (34) that removes water soluble gas and dust. Sprayed water is collected in tank (36).    USE - Breeding apparatus which utilizes exhaust gas for ventilation of the breeding room and fermentation and drying of the excrement of a domestic fowl or livestock.    ADVANTAGE - The pressure of the exhaust line is regulated and prevents too much rising of pressure. The fermentation and drying of the excrement is maintained appropriately and accelerated. Water soluble gas and dust contained in the exhaust gas is reliably removed by spraying water. The water sprayed is guided without dispersing fog-like curtain and dispersion of dust releasing bad smell of ammonia is prevented. Air pollution is reliably prevented. The wash down velocity of water is slower than the wash down velocity of dead weight and the contacting efficiency of water with flowing gas is improved. Ammonia gas and dust is removed efficiently. Water curtain is formed with less quantity of water by using the pump which circulates water. Power conservation is attempted. The size of the pump can be reduced which enhances power conservation.    DETAILED DESCRIPTION - The exhaust line (5) is formed on the upper portion of the breeding room (8) between the roof (2) and the ceiling (3). Air intake line (6) is connected with the breeding room through openings provided at the bottom of the ceiling. The connection line connects the breeding room and the exhaust line. Air blower (7) provided in the air intake line introduces outer gas for ventilation. The doors (16) adjust the pressure of the exhaust line. The exhaust gas introduced through the duct (21) is utilized for the fermentation and drying of the excrement of domestic fowl or livestock. A spraying nozzle (35) which forms the water curtain (W) near the exhaust port (34) is provided in the fermentation room and the water tank (36) collects the water sprayed. The guide plate (37) guides the sprayed water to the upper portion of the water tank. The water guide materials are arranged at equal intervals and hung from the ceiling of the fermentation room.    DESCRIPTION OF DRAWING(S) - The figure shows the cross-sectional view of the breeding apparatus.    Breeding rooms (1,8)    Roof (2)    Ceiling (3)    Exhaust line (5)    Air intake line (6)    Air blowers (7)    Door (16)    Duct (21)    Exhaust port (34)    Spraying nozzle (35)    Water tank (36)    Guide plate (37)    Water curtain (W)