PROBLEM TO BE SOLVED: To provide a calving detection system capable of detecting calving of a cow in advance or afterwards. Kind Code: A1 A detection device for detecting delivery of livestock, a storage means for storing acceleration data measured by a triaxial acceleration sensor included in a tag attached to the livestock, and a storage device for storing a predetermined time period. An acquisition unit that acquires from the storage unit a component value in a predetermined direction that is included in each of a plurality of acceleration data between the plurality of acceleration data, and a detection unit that detects the delivery of the livestock based on the plurality of component values. Is characterized by. [Selection diagram] Figure 1【課題】牛の分娩を事前に又は、事後的に早期に検知することが出来る分娩検知システムの提供。【解決手段】家畜の分娩を検知する検知装置１０であって、前記家畜に装着されたタグ２０に含まれている三軸加速度センサが測定した加速度データを記憶する記憶手段と、所定の時間の間における複数の加速度データにそれぞれ含まれる所定の方向の成分値を前記記憶手段から取得する取得手段と、前記複数の成分値に基づいて、前記家畜の分娩を検知する検知手段と、を有することを特徴とする。【選択図】図１
