PROBLEM TO BE SOLVED: To provide a livestock barn capable of reducing manufacturing cost and installation cost； and to provide its odor reduction system.SOLUTION: An odor reduction system 1 includes: a livestock barn 2 including a floor 3 to which excrete of livestock can be dropped, and a water storage part 4 made of FRP and formed under the floor, for storing water for odor reduction for receiving dropped excreta； an aeration tank 21 for aerating excreta mixed water discharged from the water storage part 4； a sedimentation tank 31 for sedimenting and separating aeration treatment sludge obtained by performing aeration treatment in the aeration tank 21； and a circulation channel 41 for circulating supernatant liquid in the sedimentation tank 31 to the water storage part 4.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】製造コストおよび設置コストの低減が可能な畜舎およびその臭気低減システムを提供する。【解決手段】家畜の糞尿が落下可能な床３と、床下に形成され、落下した糞尿を受け入れる臭気低減用の水を貯溜するＦＲＰ製の水貯溜部４と、を備える畜舎２と、水貯溜部４から排出される糞尿混合水を曝気する曝気槽２１と、曝気槽２１で曝気処理した曝気処理汚泥を沈殿分離させる沈澱槽３１と、沈澱槽３１の上澄水を水貯溜部４に環流させる環流路４１と、を備える臭気低減システム１とした。【選択図】図１
