{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:52:25Z","timestamp":1791287545571,"version":"4.1.0"},"reference-count":75,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,1,16]],"date-time":"2023-01-16T00:00:00Z","timestamp":1673827200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2018YFE0128200"],"award-info":[{"award-number":["2018YFE0128200"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["32172787"],"award-info":[{"award-number":["32172787"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100014103","name":"Key Technology Research and Development Program of Shandong","doi-asserted-by":"publisher","award":["2019JZZY020602"],"award-info":[{"award-number":["2019JZZY020602"]}],"id":[{"id":"10.13039\/100014103","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Physiol."],"abstract":"<jats:p>\n                    In this study, chlorogenic acid (CGA) was injected into the amniotic cavity of chicken embryos to study the effects of in ovo feeding of CGA on the antioxidant capacity of postnatal broilers. On the 17th day of embryonic age, a total of 300 healthy broiler fertile eggs with similar weights were randomly subjected to five groups as follows; in ovo injection with 0.5\u00a0ml CGA at 4 mg\/egg (4CGA) or 7 mg\/egg (7CGA) or 10 mg\/egg (10CGA), or sham-injection with saline (positive control, PC) or no injection (negative control, NC). Each group had six replicates of ten embryos. Six healthy chicks with similar body weights hatched from each replicate were selected and reared until heat stress treatment (35\u00b0C \u00b1 1\u00b0C, 8\u00a0h\/d) at 28\u201342\u00a0days of age. The results showed that there was no significant difference in the hatching rate between the groups (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;gt; 0.05). After heat stress treatment, 4CGA group showed an improved intestinal morphology which was demonstrated by a higher villus height in the duodenum and a higher villus height\/crypt depth ratio in the jejunum, compared with the NC group (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). The antioxidant capacity of chickens was improved by in ovo feeding of CGA since 4CGA decreased the plasma content of malondialdehyde (MDA) (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05), whereas, it increased the superoxide dismutase (SOD), glutathione peroxidase (GPX), and catalase (CAT) activities compared with NC group (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). Also, the MDA content of the different injection groups had a quadratic effect, with the 4CGA group having the lowest MDA content (\n                    <jats:italic>P<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>quadratic<\/jats:italic>\n                    <\/jats:sub>\n                    &amp;lt; 0.05). In the duodenum, 4CGA injection significantly increased the mRNA expressions of\n                    <jats:italic>nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase 1 (H O -1), glutathione synthetase (GSS),<\/jats:italic>\n                    and\n                    <jats:italic>SOD1<\/jats:italic>\n                    compared to the NC and PC groups (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). The mRNA expressions of\n                    <jats:italic>glutathione reductase (GSR)<\/jats:italic>\n                    and\n                    <jats:italic>GPX7<\/jats:italic>\n                    were significantly increased in all CGA-treated groups compared with the PC group (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05), while the mRNA expression of\n                    <jats:italic>CAT<\/jats:italic>\n                    was significantly increased by 4CGA group than the NC group (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). The mRNA expressions of epigenetic-related genes,\n                    <jats:italic>ten eleven translocation 1 and 2 (Tet1 and Tet2),<\/jats:italic>\n                    and\n                    <jats:italic>DNA-methyltransferase 3 alpha (DNMT3A)<\/jats:italic>\n                    in the duodenum of 4CGA injected group was significantly increased compared with the NC and PC groups (\n                    <jats:italic>p<\/jats:italic>\n                    &amp;lt; 0.05). The mRNA expressions of\n                    <jats:italic>Nrf2<\/jats:italic>\n                    ,\n                    <jats:italic>SOD1<\/jats:italic>\n                    , and\n                    <jats:italic>Tet2<\/jats:italic>\n                    showed a significant quadratic effects with the 4CGA group having the highest expression (\n                    <jats:italic>P<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>quadratic<\/jats:italic>\n                    <\/jats:sub>\n                    &amp;lt; 0.05). In conclusion, in ovo feeding of CGA alleviated heat stress-induced intestinal oxidative damage. Injection with CGA of 4 mg\/egg is considered most effective due to its actions in improving intestinal antioxidant capacity, especially in the duodenum. The antioxidant effects of in ovo CGA on postnatal heat-stressed broilers may be related to its regulation of epigenetic mechanisms. Thus, this study provides technical knowledge to support the in ovo feeding of CGA to alleviate oxidative stress in postnatal heat-stressed broilers.\n                  <\/jats:p>","DOI":"10.3389\/fphys.2023.1091520","type":"journal-article","created":{"date-parts":[[2023,1,16]],"date-time":"2023-01-16T00:28:05Z","timestamp":1673828885000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":17,"title":["Effects of in ovo feeding of chlorogenic acid on antioxidant capacity of postnatal broilers"],"prefix":"10.3389","volume":"14","author":[{"given":"Yali","family":"Pan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hai","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongchao","family":"Jiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingpeng","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaojuan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2023,1,16]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"5496","DOI":"10.1021\/jf000483q","article-title":"Absorption of chlorogenic acid and caffeic acid in rats after oral administration","volume":"48","author":"Azuma","year":"2000","journal-title":"J. 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