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However, little is known on the changes with clock gene expressions during this feeding behaviour. In our present study, the linkage of clock gene expressions and feeding behaviour in dusk feeding was investigated in laying hens under two lighting programs: the conventional lighting program (Control) with a light period from 05:00 AM to 21:00 PM and a dark period from 21:00 PM to 05:00 AM; or the shifted lighting program group (SLP) with a light period from 02:00 AM to 18:00 PM and a dark period from 18:00 PM to 02:00 AM. The gene expression\u2010related appetite and circadian rhythm were investigated in hypothalamus and proventriculus at 1, 3 and 5\u00a0h before scotophase. The results demonstrated that dusk feeding was synchronously shifted with altered lighting program, dusk feeding was observed from 5\u00a0h before scotophase in both groups. The expressions of anorexigenic gene proopiomelanocortin (<jats:italic>POMC<\/jats:italic>) and cocaine\u2010 and amphetamine\u2010regulated transcript (<jats:italic>CART<\/jats:italic>) were downregulated (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05) during dusk feeding and changed in pace with lighting program. The expressions of clock gene <jats:italic>period 2<\/jats:italic> (<jats:italic>Per2<\/jats:italic>) and <jats:italic>cryptochrome 1<\/jats:italic> (<jats:italic>Cry1<\/jats:italic>) in hypothalamus were downregulated (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05) during dusk feeding and shifted by lighting program. In the proventriculus, ghrelin expression was decreased (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05) during dusk feeding by lighting program. In conclusion, the expressions of clock genes <jats:italic>Per2<\/jats:italic> and <jats:italic>Cry1<\/jats:italic> are linked with the downregulated expressions of anorexigenic genes, <jats:italic>POMC<\/jats:italic> and <jats:italic>CART<\/jats:italic>, and in turn the augmented feed intake at dusk.<\/jats:p>","DOI":"10.1111\/jpn.13528","type":"journal-article","created":{"date-parts":[[2021,3,28]],"date-time":"2021-03-28T09:59:50Z","timestamp":1616925590000},"page":"1103-1112","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Dusk feeding in laying hens is shifted by light program via involvement of clock genes"],"prefix":"10.1111","volume":"105","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4235-9404","authenticated-orcid":false,"given":"Xiaojuan","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Animal Science &amp; Technology Shandong Provincial Key Laboratory of Animal Biotechnology 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and Prevention Shandong Agricultural University Shandong China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hai","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Animal Science &amp; Technology Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention Shandong Agricultural University Shandong 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