{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T09:05:59Z","timestamp":1774256759073,"version":"3.50.1"},"reference-count":62,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T00:00:00Z","timestamp":1636675200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The identification of social interactions is of fundamental importance for animal behavioral studies, addressing numerous problems like investigating the influence of social hierarchical structures or the drivers of agonistic behavioral disorders. However, the majority of previous studies often rely on manual determination of the number and types of social encounters by direct observation which requires a large amount of personnel and economical efforts. To overcome this limitation and increase research efficiency and, thus, contribute to animal welfare in the long term, we propose in this study a framework for the automated identification of social contacts. In this framework, we apply a convolutional neural network (CNN) to detect the location and orientation of pigs within a video and track their movement trajectories over a period of time using a Kalman filter (KF) algorithm. Based on the tracking information, we automatically identify social contacts in the form of head\u2013head and head\u2013tail contacts. Moreover, by using the individual animal IDs, we construct a network of social contacts as the final output. We evaluated the performance of our framework based on two distinct test sets for pig detection and tracking. Consequently, we achieved a Sensitivity, Precision, and F1-score of 94.2%, 95.4%, and 95.1%, respectively, and a MOTA score of 94.4%. The findings of this study demonstrate the effectiveness of our keypoint-based tracking-by-detection strategy and can be applied to enhance animal monitoring systems.<\/jats:p>","DOI":"10.3390\/s21227512","type":"journal-article","created":{"date-parts":[[2021,11,14]],"date-time":"2021-11-14T20:51:53Z","timestamp":1636923113000},"page":"7512","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Detecting Animal Contacts\u2014A Deep Learning-Based Pig Detection and Tracking Approach for the Quantification of Social Contacts"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7839-2751","authenticated-orcid":false,"given":"Martin","family":"Wutke","sequence":"first","affiliation":[{"name":"Breeding Informatics Group, Department of Animal Sciences, Georg-August University, Margarethe von Wrangell-Weg 7, 37075 G\u00f6ttingen, Germany"},{"name":"Livestock Systems, Department of Animal Sciences, Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6093-8522","authenticated-orcid":false,"given":"Felix","family":"Heinrich","sequence":"additional","affiliation":[{"name":"Breeding Informatics Group, Department of Animal Sciences, Georg-August University, Margarethe von Wrangell-Weg 7, 37075 G\u00f6ttingen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0165-5167","authenticated-orcid":false,"given":"Pronaya Prosun","family":"Das","sequence":"additional","affiliation":[{"name":"Bioinformatics Group, Fraunhofer Institute for Toxicology and Experimental Medicine (Fraunhofer ITEM), Nikolai-Fuchs-Str. 1, 30625 Hannover, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3240-6286","authenticated-orcid":false,"given":"Anita","family":"Lange","sequence":"additional","affiliation":[{"name":"Livestock Systems, Department of Animal Sciences, Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4769-9539","authenticated-orcid":false,"given":"Maria","family":"Gentz","sequence":"additional","affiliation":[{"name":"Livestock Systems, Department of Animal Sciences, Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9761-0291","authenticated-orcid":false,"given":"Imke","family":"Traulsen","sequence":"additional","affiliation":[{"name":"Livestock Systems, Department of Animal Sciences, Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"}]},{"given":"Friederike K.","family":"Warns","sequence":"additional","affiliation":[{"name":"Agricultural Test and Education Centre House D\u00fcsse, Chamber of Agriculture North Rhine-Westphalia, Haus D\u00fcsse 2, 59505 Bad Sassendorf, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4910-9467","authenticated-orcid":false,"given":"Armin Otto","family":"Schmitt","sequence":"additional","affiliation":[{"name":"Breeding Informatics Group, Department of Animal Sciences, Georg-August University, Margarethe von Wrangell-Weg 7, 37075 G\u00f6ttingen, Germany"},{"name":"Center for Integrated Breeding Research (CiBreed), Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3297-3192","authenticated-orcid":false,"given":"Mehmet","family":"G\u00fcltas","sequence":"additional","affiliation":[{"name":"Center for Integrated Breeding Research (CiBreed), Georg-August University, Albrecht-Thaer-Weg 3, 37075 G\u00f6ttingen, Germany"},{"name":"Statistics and Data Science, Faculty of Agriculture, South Westphalia University of Applied Sciences, 59494 Soest, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Verdon, M., and Rault, J.L. 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