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Once established, social ranks are maintained through subtler interactions allowing the redirection of energy away from agonistic interactions towards other needs. The available tasks for assessing social rank in rats allow the study of the mechanisms by which social hierarches are formed in early phases but fail to assess the maintenance of established hierarchies between stable pairs of animals, which might rely on distinct neurobiological mechanisms. Here we present and validate a novel trial-based dominancy assay, the modified Food Competition test, where established social hierarchies can be identified in the home cage of non-food deprived pairs of male rats. In this task, we introduce a small conflict in the home cage, where access to a new feeder containing palatable pellets can only be gained by one animal at a time. We found that this subtle conflict triggered asymmetric social interactions and resulted in higher consumption of food by one of the animals in the pair, which reliably predicted hierarchy in other tests. Our findings reveal stable dominance status in pair-housed rats and provide a novel tool for the evaluation of established social hierarchies, the modified Food Competition test, that is robust and easy to implement.<\/jats:p>","DOI":"10.1038\/s41598-021-93818-0","type":"journal-article","created":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T06:03:33Z","timestamp":1626415413000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Novel competition test for food rewards reveals stable dominance status in adult male rats"],"prefix":"10.1038","volume":"11","author":[{"given":"Diana F.","family":"Costa","sequence":"first","affiliation":[]},{"given":"Marta A.","family":"Moita","sequence":"additional","affiliation":[]},{"given":"Cristina","family":"M\u00e1rquez","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,7,16]]},"reference":[{"key":"93818_CR1","doi-asserted-by":"publisher","first-page":"393","DOI":"10.1146\/annurev.anthro.33.070203.144000","volume":"33","author":"RM Sapolsky","year":"2004","unstructured":"Sapolsky, R. 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