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(PDF) Are free-ranging Kune Kune pigs (Sus scrofa domesticus) able to solve a cooperative task?
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window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":79940421,"created_at":"2022-05-25T23:21:50.849-07:00","from_world_paper_id":206313974,"updated_at":"2024-11-25T01:27:14.482-08:00","_data":{"publisher":"Elsevier BV","grobid_abstract":"Cooperative behaviour has been observed in many species and in several domains like cooperative hunting, cooperative predator defence and cooperative breeding. From an evolutionary perspective, it is an efficient way to increase one's own success, which ultimately has positive fitness consequences. However, the underlying mechanism in terms of the motivational and cognitive processes is less clear. Pigs are cooperative breeders, highly sociable and possess advanced skills in various cognitive domains and sensory modalities. The aim of this study was to explore whether domestic pigs would cooperate to acquire resources. We tested this using the Joint-Log-Lift task, which requires that two pigs lift a wooden log simultaneously to obtain food. Ten same-sex dyads of free-ranging Kune Kune pigs were tested. They did not interact with the apparatus in at least one of a six-trial session and hence, did not solve the task spontaneously, but became successful after several training steps including both individual and partner training. Because the Joint-Log-Lift task requires behavioural coordination to be solved cooperatively and efficiently, we tested the pigs' understanding of the need for coordination in two classical tests. A 10 or 30 s delay condition tested whether the pig who was released earlier into the testing arena would wait for the partner before lifting the log. A visual barrier condition tested whether the inability to see the partner would reduce the synchronicity of their actions toward the log. The dyads did not respond differently in the two testing manipulations, therefore failing to show evidence for coordinated behaviour. We discussed these findings in terms of weak understanding of the cooperative requirements of the task, disadvantageous training and low impulse control. Further studies on the pigs' cognitive capabilities to adjust or coordinate their behaviour to conspecifics are important as they have potential implications for their welfare.","publication_date":"2021,,","publication_name":"Applied Animal Behaviour Science","grobid_abstract_attachment_id":"86487823"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Are free-ranging Kune Kune pigs (Sus scrofa domesticus) able to solve a cooperative task?","broadcastable":false,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [75790937]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 'edu.academia.applesignon';</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":86487823,"attachmentType":"pdf"}"><img alt="First page of “Are free-ranging Kune Kune pigs (Sus scrofa domesticus) able to solve a cooperative task?”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/86487823/mini_magick20220525-15047-1bn711h.png?1653546226" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/assets/single_work_splash/adobe.icon-574afd46eb6b03a77a153a647fb47e30546f9215c0ee6a25df597a779717f9ef.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Are free-ranging Kune Kune pigs (Sus scrofa domesticus) able to solve a cooperative task?</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="75790937" href="https://vetmeduni.academia.edu/LudwigHuber"><img alt="Profile image of Ludwig Huber" class="ds-work-card--author-avatar" src="https://0.academia-photos.com/75790937/18948742/18897196/s65_ludwig.huber.jpg" />Ludwig Huber</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">2021, Applied Animal Behaviour Science</p><div class="ds-work-card--work-metadata"><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">visibility</span><p class="ds2-5-body-sm" id="work-metadata-view-count">…</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">description</span><p class="ds2-5-body-sm">10 pages</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">link</span><p class="ds2-5-body-sm">1 file</p></div></div><script>(async () => { const workId = 79940421; 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We extended the study of animal social tactics to the domestic pig, Sus scrofa, by using an experimental analogue of natural foraging skills, the &amp;#39;informed forager&amp;#39; paradigm. We investigated the behaviour of 16 pigs foraging in pairs in an arena in which food had been hidden in one of eight monopolizable buckets. Before each pair trial, one of the pigs, the &amp;#39;informed&amp;#39; pig, was given privileged knowledge about the location of the food during a solitary search trial. The &amp;#39;noninformed&amp;#39; pig was naïve about the location of the food during pair trials, but heavier than its informed partner and thus able to displace the latter from the baited bucket. By first focusing on the informed pigs&amp;#39; behaviour, we show that pigs are able to remember and relocate the food site. They found the food in relocation trials, using fewer bucket investigations than expected of a random searcher. Second, by focusing on the noninformed pigs, we show that pigs are able to exploit the knowledge of others by following them to a food source. They investigated more buckets immediately after their informed partners significantly more often than expected by chance and required fewer bucket investigations to find the food in pair trials than expected from a random searcher, but not in solitary search trials. We discuss these latter findings with reference to social foraging tactics. Copyright 2000 The Association for the Study of Animal Behaviour.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Social tactics of pigs in a competitive foraging task: the ‘informed forager’ paradigm","attachmentId":42123396,"attachmentType":"pdf","work_url":"https://www.academia.edu/18976962/Social_tactics_of_pigs_in_a_competitive_foraging_task_the_informed_forager_paradigm","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/18976962/Social_tactics_of_pigs_in_a_competitive_foraging_task_the_informed_forager_paradigm"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="18412541" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/18412541/Conflict_and_cooperation_sociobiological_principles_and_the_behaviour_of_pigs">Conflict and cooperation: sociobiological principles and the behaviour of pigs</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="38421916" href="https://independent.academia.edu/EdmondPajor">Edmond Pajor</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Applied Animal Behaviour Science, 1995</p><p class="ds-related-work--abstract ds2-5-body-sm">... Reproduced with the cooperation of the Beinecke Rare Book and Manuscript Library, Yale University. ... Rushen and Pajor, 1987), a subtle type of withinlitter competition that persists throughout lactation (Fraser, 1990), and a rich repertoire of vocal communication (Grauvogl, 1958 ...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Conflict and cooperation: sociobiological principles and the behaviour of pigs","attachmentId":42171130,"attachmentType":"pdf","work_url":"https://www.academia.edu/18412541/Conflict_and_cooperation_sociobiological_principles_and_the_behaviour_of_pigs","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/18412541/Conflict_and_cooperation_sociobiological_principles_and_the_behaviour_of_pigs"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="85842094" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/85842094/Domestic_pigs_Sus_scrofa_adjust_their_foraging_behaviour_to_whom_they_are_foraging_with">Domestic pigs, Sus scrofa, adjust their foraging behaviour to whom they are foraging with</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="58074360" href="https://independent.academia.edu/FrielMary">Mary Friel</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Animal Behaviour, 2010</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Domestic pigs, Sus scrofa, adjust their foraging behaviour to whom they are foraging with","attachmentId":90420724,"attachmentType":"pdf","work_url":"https://www.academia.edu/85842094/Domestic_pigs_Sus_scrofa_adjust_their_foraging_behaviour_to_whom_they_are_foraging_with","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/85842094/Domestic_pigs_Sus_scrofa_adjust_their_foraging_behaviour_to_whom_they_are_foraging_with"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="34212309" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/34212309/Domestic_pigs_alter_their_social_strategy_in_response_to_social_group_size">Domestic pigs alter their social strategy in response to social group size</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="67218599" href="https://independent.academia.edu/HaroldGonyou">Harold Gonyou</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="67279341" href="https://independent.academia.edu/TSamarakone">T. Samarakone</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Applied Animal Behaviour Science, 2009</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Domestic pigs alter their social strategy in response to social group size","attachmentId":54128230,"attachmentType":"pdf","work_url":"https://www.academia.edu/34212309/Domestic_pigs_alter_their_social_strategy_in_response_to_social_group_size","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/34212309/Domestic_pigs_alter_their_social_strategy_in_response_to_social_group_size"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="95719572" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/95719572/Behaviour_of_Domestic_Pigs_in_a_Visual_Perspective_Taking_Task">Behaviour of Domestic Pigs in a Visual Perspective Taking Task</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="37434561" href="https://independent.academia.edu/MikeMendl">Mike Mendl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Behaviour, 2001</p><p class="ds-related-work--abstract ds2-5-body-sm">Animals with visual perspective taking abilities should differ in their responses to individuals that do and individuals that do not have visual access to some critical event. We investigated whether domestic pigs show behaviour consistent with this ability. Ten subjects were trained to move from a start box into one of four corridors that they had seen a human enter with a bucket for baiting. They received a food reward for choosing the correct corridor. In unrewarded probe tests, the subjects&#39; view of the corridors was blocked, but they could see a &#39;seeing&#39; companion pig who had visual access to the baiting event, and another, whose view was also blocked, located in start boxes to their left and right. After the companions had been released and entered corridors, the subject was released and which companion it followed was recorded. Eight pigs followed companions less frequently than expected by chance, probably due to specific corridor or centre/side preferences. Howe...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Behaviour of Domestic Pigs in a Visual Perspective Taking Task","attachmentId":97824005,"attachmentType":"pdf","work_url":"https://www.academia.edu/95719572/Behaviour_of_Domestic_Pigs_in_a_Visual_Perspective_Taking_Task","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/95719572/Behaviour_of_Domestic_Pigs_in_a_Visual_Perspective_Taking_Task"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="63870638" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/63870638/Thinking_Pigs_A_Comparative_Review_of_Cognition_Emotion_and_Personality_in_Sus_domesticus">Thinking Pigs: A Comparative Review of Cognition, Emotion, and Personality in Sus domesticus</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="43541696" href="https://independent.academia.edu/LoriMarino1">Lori Marino</a></div><p class="ds-related-work--metadata ds2-5-body-xs">International Journal of Comparative Psychology, 2015</p><p class="ds-related-work--abstract ds2-5-body-sm">While relatively little is known about the psychology of domestic pigs, what is known suggests that pigs are cognitively complex and share many traits with animals whom we consider intelligent. This paper reviews the scientific evidence for cognitive complexity in domestic pigs and, when appropriate, compares this literature with similar findings in other animals, focusing on some of the more compelling and cutting-edge research results. The goals of this paper are to: 1) frame pig cognition and psychology in a basic comparative context independent of the livestock production and management setting; and 2) identify areas of research with pigs that are particularly compelling and in need of further investigation. We summarize and discuss several areas of comparative psychology, including nonsocial and social cognition, self-awareness, emotion, and personality. We conclude that there are several areas of research in which the findings are suggestive of complex psychology in pigs. We ...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Thinking Pigs: A Comparative Review of Cognition, Emotion, and Personality in Sus domesticus","attachmentId":76150421,"attachmentType":"pdf","work_url":"https://www.academia.edu/63870638/Thinking_Pigs_A_Comparative_Review_of_Cognition_Emotion_and_Personality_in_Sus_domesticus","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/63870638/Thinking_Pigs_A_Comparative_Review_of_Cognition_Emotion_and_Personality_in_Sus_domesticus"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="114344001" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/114344001/Discrimination_of_conspecifics_by_juvenile_domestic_pigs_Sus_scrofa">Discrimination of conspecifics by juvenile domestic pigs, Sus scrofa</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="37434561" href="https://independent.academia.edu/MikeMendl">Mike Mendl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Animal Behaviour, 2005</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Discrimination of conspecifics by juvenile domestic pigs, Sus scrofa","attachmentId":111067445,"attachmentType":"pdf","work_url":"https://www.academia.edu/114344001/Discrimination_of_conspecifics_by_juvenile_domestic_pigs_Sus_scrofa","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/114344001/Discrimination_of_conspecifics_by_juvenile_domestic_pigs_Sus_scrofa"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="104406630" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/104406630/The_Social_Life_of_Pigs_Changes_in_Affiliative_and_Agonistic_Behaviors_following_Mixing">The Social Life of Pigs: Changes in Affiliative and Agonistic Behaviors following Mixing</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="38631867" href="https://independent.academia.edu/JaniceSiegford">Janice Siegford</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Animals, 2022</p><p class="ds-related-work--abstract ds2-5-body-sm">This study investigated potentially affiliative behaviors in grow-finish pigs, how these behaviors changed over time and their relationship to agonistic behaviors. A total of 257 Yorkshire barrows were observed for agonistic (reciprocal fights, attacks) and affiliative (nosing, play, non-agonistic contact) behaviors after mixing (at 10 weeks of age), and weeks 3, 6, and 9 after mix. The least square means of affiliative behaviors were compared across time points. Relationships among affiliative and agonistic behaviors were assessed using generalized linear mixed models. Non-agonistic contact with conspecifics increased until week 6 then remained stable between weeks 6 and 9. Nosing was highest at mix, then decreased in the following weeks. Play was lowest at mix and highest at week 3. Affiliative behaviors were negatively related with aggression at mix (p &lt; 0.001). Pigs who engaged in play and nosing behaviors were more likely to be involved in agonistic interactions in the weeks...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"The Social Life of Pigs: Changes in Affiliative and Agonistic Behaviors following Mixing","attachmentId":104145445,"attachmentType":"pdf","work_url":"https://www.academia.edu/104406630/The_Social_Life_of_Pigs_Changes_in_Affiliative_and_Agonistic_Behaviors_following_Mixing","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/104406630/The_Social_Life_of_Pigs_Changes_in_Affiliative_and_Agonistic_Behaviors_following_Mixing"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="84826318" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/84826318/Investigating_the_Reward_Cycle_of_Play_in_Pigs_Sus_scrofa_">Investigating the Reward Cycle of Play in Pigs (Sus scrofa)</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="98153302" href="https://slu-se.academia.edu/LLidfors">Lena Lidfors</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Frontiers in Animal Science, 2021</p><p class="ds-related-work--abstract ds2-5-body-sm">Observations of play in animals have been suggested as a promising indicator of positive emotions and thus of positive animal welfare. However, if play can follow the proposed reward cycle concept where animals estimate and value reward differently in different phases of the cycle (anticipation, consummation and post-consummation) is unclear. To investigate if a reward cycle for play exists in growing pigs, we carried out an exploratory study where pigs were tested when they were naïve to a reward cycle test (first occasion) against when they were accustomed to going through the test after having the access to an open play arena with objects. Forty undocked pigs were housed in a weaner stable with two castrated males and two females per pen. Within each litter, we randomly selected and tested one male and one female test pig, each being tested as naïve or accustomed to the testing environment. The first week the pigs (n = 20) were tested four times and regarded as naïve during the f...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Investigating the Reward Cycle of Play in Pigs (Sus scrofa)","attachmentId":89718028,"attachmentType":"pdf","work_url":"https://www.academia.edu/84826318/Investigating_the_Reward_Cycle_of_Play_in_Pigs_Sus_scrofa_","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/84826318/Investigating_the_Reward_Cycle_of_Play_in_Pigs_Sus_scrofa_"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="5285208" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/5285208/Cognitive_Enrichment_in_Piglet_Rearing_An_Approach_to_Enhance_Animal_Welfare_and_to_Reduce_Aggressive_Behaviour_Academic_Editors_D">Cognitive Enrichment in Piglet Rearing: An Approach to Enhance Animal Welfare and to Reduce Aggressive Behaviour Academic Editors: D</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="2617668" href="https://independent.academia.edu/Ismayilova">Gunel Ismayilova</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Cognitive Enrichment in Piglet Rearing: An Approach to Enhance Animal Welfare and to Reduce Aggressive Behaviour Academic Editors: D","attachmentId":32457517,"attachmentType":"pdf","work_url":"https://www.academia.edu/5285208/Cognitive_Enrichment_in_Piglet_Rearing_An_Approach_to_Enhance_Animal_Welfare_and_to_Reduce_Aggressive_Behaviour_Academic_Editors_D","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/5285208/Cognitive_Enrichment_in_Piglet_Rearing_An_Approach_to_Enhance_Animal_Welfare_and_to_Reduce_Aggressive_Behaviour_Academic_Editors_D"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":86487823,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":86487823,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_86487823" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. 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translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="2" data-entity-id="26169551" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/26169551/Physiological_and_reproductive_correlates_of_behavioural_strategies_in_female_domestic_pigs">Physiological and reproductive correlates of behavioural strategies in female domestic pigs</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33594451" href="https://cambridge.academia.edu/DMBroom">Donald M Broom</a><span>, </span><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="37434561" href="https://independent.academia.edu/MikeMendl">Mike Mendl</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Animal Behaviour, 1992</p><div 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