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In Exp.1, six animals (8\u00a0weeks old, 97\u00a0\u00b1\u00a04.1\u00a0kg BW) were exposed to yellow or blue LED for 2\u00a0hr before darkness over 7\u00a0days under a long\u2010day photoperiod (LDPP). In Exp. 2, six animals (8\u00a0weeks old, 88.5\u00a0\u00b1\u00a04.8\u00a0kg BW) were exposed to blue light from a white LED all daytime or a yellow LED for 2\u00a0hr before the darkness of LDPP (blue light cut) over 3\u00a0weeks. In Exp. 1, blue light mildly suppressed melatonin secretion during the 2\u2010hr treatment but did not affect the timing of the nightly melatonin rise. However, the rise in nighty melatonin levels was higher with yellow than blue LED. In Exp. 2, white LED completely suppressed melatonin secretion during the 2\u2010hr treatment, but plasma melatonin concentrations were similar during the darkness. Grass hay intake, rumination time, frequency of water intake and body weight gain were higher in animals exposed to the yellow rather than the white LED. Overall results indicate that exposure to blue light from white LEDs under an LDPP suppresses melatonin secretion and might negatively impact the development of female dairy calves.<\/jats:p>","DOI":"10.1111\/asj.13353","type":"journal-article","created":{"date-parts":[[2020,2,28]],"date-time":"2020-02-28T06:30:01Z","timestamp":1582871401000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Exposure to blue LED light before the onset of darkness under a long\u2010day photoperiod alters melatonin secretion, feeding behaviour and growth in female dairy calves"],"prefix":"10.1111","volume":"91","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0596-6547","authenticated-orcid":false,"given":"Mabrouk","family":"Elsabagh","sequence":"first","affiliation":[{"name":"Graduate School of Integrated Sciences for Life Hiroshima University Higashi\u2010Hiroshima Japan"},{"name":"Department of Animal Production and Technology Faculty of Agricultural Sciences and Technologies Ni\u011fde \u00d6mer Halisdemir University Ni\u011fde Turkey"},{"name":"Department of Nutrition and Clinical Nutrition Faculty of Veterinary Medicine Kafrelsheikh University Kafrelsheikh Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mamiko","family":"Mon","sequence":"additional","affiliation":[{"name":"Graduate School of Integrated Sciences for Life Hiroshima University Higashi\u2010Hiroshima Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yui","family":"Takao","sequence":"additional","affiliation":[{"name":"Graduate School of Integrated Sciences for Life Hiroshima University Higashi\u2010Hiroshima Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akiko","family":"Shinoda","sequence":"additional","affiliation":[{"name":"Showa Denko K.K Kawasaki Kanagawa Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Showa Denko K.K Kawasaki Kanagawa Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiro","family":"Kushibiki","sequence":"additional","affiliation":[{"name":"NARO Institute of Livestock and Grassland Science Tsukuba Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4415-6181","authenticated-orcid":false,"given":"Taketo","family":"Obitsu","sequence":"additional","affiliation":[{"name":"Graduate School of Integrated Sciences for Life Hiroshima University Higashi\u2010Hiroshima Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5502-3451","authenticated-orcid":false,"given":"Toshihisa","family":"Sugino","sequence":"additional","affiliation":[{"name":"Graduate School of Integrated Sciences for Life Hiroshima University Higashi\u2010Hiroshima Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,2,27]]},"reference":[{"key":"e_1_2_6_2_1","unstructured":"Alferink R. 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