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We followed the hypothesis that increased restlessness in mares shortly before the expulsive stage of labour can be detected with such accelerometers. Accelerometers were attached medioventrally to the halter of eight late pregnant mares. To evaluate an influence of accelerometer position, in one mare two additional accelerometers were attached close to the mandibular and atlanto\u2010occipital joints. Accelerometers were programmed to send 600\u00a0signals\/min (10\u00a0Hz). Signals were recorded continuously and, for evaluation, four intervals of 30\u2010min duration on day 4 before foaling and the last 2\u00a0hr before rupture of the allantochorion at foaling were selected. Signal detection was influenced by position of the accelerometer on the mares\u2019 halter. The highest signal detection rate was reached with the accelerometer in the lateral and dorsal position but differences of accelerations measured by the system differed neither between sensor positions nor between time intervals 4\u00a0days before foaling. Differences of accelerations increased from 120\u00a0min before foaling until birth of the foal (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001) and this increase was most pronounced during the last 30\u201320\u00a0min before birth of the foal (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). Technical improvements and a foaling specific algorithm are required to improve the accuracy to predict foaling. Even if this preliminary study included only a small number of mares, results demonstrate that accelerometers could be an important component of birth alert systems in horses in the future.<\/jats:p>","DOI":"10.1111\/rda.13250","type":"journal-article","created":{"date-parts":[[2018,7,30]],"date-time":"2018-07-30T09:51:01Z","timestamp":1532944261000},"page":"1279-1286","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Detection of the time of foaling by accelerometer technique in horses (<i>Equus caballus<\/i>)\u2014a pilot study"],"prefix":"10.1111","volume":"53","author":[{"given":"Constanze","family":"Hartmann","sequence":"first","affiliation":[{"name":"Centre for Artificial Insemination and Embryo Transfer Vetmeduni Vienna Vienna Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Lidauer","sequence":"additional","affiliation":[{"name":"Smartbow GmbH Weibern 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