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Selection on young boars using proxies for human-directed defensive aggression would be advantageous because their high reproductive contribution allows them to substantially influence the genetic composition of subsequent generations. We analysed feeding behaviours expected to reflect individual personality and social influences, in pre-pubertal male pigs and estimated their genetic correlations with maternal defensive aggression. Automatically recorded feeding data were available for group-housed Swiss Landrace (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009725) and Swiss Large White (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009943) boars and castrated males, from which we derived five traits: Average Daily Intake, Average Daily feeding Duration, Average Interval between Successive feeder Visits, Average Time from the group-level Peak of Activity at the feeder and Average Proportion of Visits at Night. Maternal defensive aggression was assessed in Swiss Landrace sows applying a Piglet Handling Test (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009376) and a Farmers\u2019 Aggressiveness Score (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009406). Genetic parameters were estimated using Bayesian linear mixed models, with a genomic relationship matrix computed based on 60\u00a0K SNP-chip genotypes. Feeding traits\u2019 heritabilities were moderate to high (estimate\u2009\u00b1\u2009SE: 0.25\u2009\u00b1\u20090.04 to 0.50\u2009\u00b1\u20090.04). Average Daily Intake and Average Time from the Peak of Activity were genetically correlated with the Piglet Handling Test (0.28\u2009\u00b1\u20090.27) and the Farmers\u2019 Aggressiveness Score (-0.33\u2009\u00b1\u20090.23), respectively. Higher intake and visiting the feeder at busier times were genetically associated with sows\u2019 higher aggressiveness towards humans. Pre-pubertal feeding strategies are promising indirect selection criteria for calmer sows.\n                  <\/jats:p>","DOI":"10.1007\/s10519-026-10292-y","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T09:40:49Z","timestamp":1792662049000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Feeding Behaviour of Pre-pubertal Males is Genetically Associated with Maternal Defensive Aggression in Sows"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5153-2697","authenticated-orcid":false,"given":"Nicole","family":"Maffezzini","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9501-9040","authenticated-orcid":false,"given":"Negar","family":"Khayatzadeh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9198-9448","authenticated-orcid":false,"given":"Simon","family":"Turner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4880-3756","authenticated-orcid":false,"given":"Rainer","family":"Roehe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9808-2742","authenticated-orcid":false,"given":"Ricardo","family":"Pong-Wong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1801-254X","authenticated-orcid":false,"given":"Richard B.","family":"D\u2019Eath","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,22]]},"reference":[{"key":"10292_CR1","doi-asserted-by":"publisher","first-page":"1616","DOI":"10.3390\/genes13091616","volume":"13","author":"S Agha","year":"2022","unstructured":"Agha S, Turner SP, Lewis CRG, Desire S, Roehe R, Doeschl-Wilson A (2022) Genetic associations of novel behaviour traits derived from social network analysis with growth, feed efficiency, and carcass characteristics in pigs. 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Animals were watched closely upon testing and farm staff were promptly alerted if anything concerning regarding their welfare was noticed. Given the nature of the employed tests, sows may have experienced distress when hearing a piglet's squeal and\/or when a human picked up one of their piglets. Being picked up is a stressful event for the piglet itself. Aversive conditions were mitigated by limiting the duration of all tests to less than two minutes and by interrupting testing if any animal involved showed extreme sign of distress (e.g. sow tried to climb out of her pen). The SRUC Animal Ethics Committee (RPR 2023-002 PIG; AEX 2023-019 PIG; AEX 2024-010 PIG) and University of Edinburgh R(D)SVS Veterinary Ethical Review Committee (VERC reference 87.23) approved the experiment. The University of Edinburgh Human Ethical Review Committee (HERC reference: HERC_2023_079) and SRUC Social Science Ethics Committee approved the experiment.","order":2,"name":"Ethics","label":"Ethical Approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors did not use any artificial intelligence assisted technologies in the writing process.","order":3,"name":"Ethics","label":"Declaration of Generative AI and AI-assisted Technologies in the Writing Process","group":{"name":"EthicsHeading","label":"Declarations"}}]}}