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The experiment was conducted in a factorial completely randomized design, with two light regimes (intermittent light varying according to bird age and continuous light under an 18\u2009h light\/6\u2009h dark photoperiod) and four times of slaughter (2:00, 8:00, 14:00 and 20:00\u2009h). There was an interaction effect on <jats:italic>PEPT1<\/jats:italic> and <jats:italic>AANAT<\/jats:italic> expression, lipid and protein oxidation and superoxide dismutase (SOD) activity. In both light regimes, <jats:italic>PEPT1<\/jats:italic> expression responded cubically to slaughter time. In the continuous light group, <jats:italic>PEPT1<\/jats:italic> expression was highest in birds slaughtered at 2:00 and 14:00\u2009h, whereas, in the intermittent light treatment, expression was highest at 8:00\u2009h. In the continuous light regime, <jats:italic>AANAT<\/jats:italic> expression had a cubic relationship with time of slaughter, with the greatest values recorded at 20:00\u2009h. In the intermittent light regime, slaughter time showed a cubic effect on lipid oxidation, which was highest at 8:00\u2009h. In the continuous light group, there was a cubic effect on nitrite concentration, lipid oxidation, protein oxidation, and SOD activity; nitrite levels, lipid oxidation, and protein oxidation were highest and SOD activity was lowest in birds slaughtered at 14:00\u2009h. Time of slaughter influenced catalase activity, which responded cubically; catalase activity was lowest at 8:00 and 14:00\u2009h. This study is the first to demonstrate that <jats:italic>PEPT1<\/jats:italic> expression in the jejunum of broilers follows a diurnal rhythm and varies according to light regime. The results also suggest that mainly continuous lighting and slaughter at 14:00\u2009h when the animals are possibly more active may be more stressful to broilers.<\/jats:p>","DOI":"10.1111\/jpn.13712","type":"journal-article","created":{"date-parts":[[2022,4,11]],"date-time":"2022-04-11T05:30:44Z","timestamp":1649655044000},"page":"607-620","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The effect of light regime and time of slaughter in broiler on broiler performance, liver antioxidant status, and expression of genes related to peptide absorption in the jejunum and melatonin synthesis in the brain"],"prefix":"10.1111","volume":"107","author":[{"given":"Mauricio Pires de","family":"Pontes","sequence":"first","affiliation":[{"name":"Graduate Program in Environmental Biotechnology State University of Maring\u00e1, Jardim Universit\u00e1rio Maring\u00e1 Paran\u00e1 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