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The body and testicular weights were significantly (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) higher at 16 and 22 than at 28\u2009weeks of age. The circumference and diameter of the seminiferous tubules were significantly (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) higher at 28 and 34 than at 10 and 16\u2009weeks of age. Histological evaluation of testicular slices revealed advanced and effective seminiferous tubes as early as 10\u2009weeks, while spermatogenic activity peaked at 16\u2009weeks of age. The highest semen volume, sperm motility and sperm concentration were observed at weeks of age and then decreased gradually with age. At the same time, the testosterone level and libido were significantly (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) higher at 22 than at 10\u2009weeks of age. Furthermore, the age was positive (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05), correlated to seminiferous tubule circumference and diameter, and negative (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05), correlated to sperm concentration. In conclusion, the age of quail markedly affected the testicular histological structure, libido, testosterone level and semen characteristics.<\/jats:p>","DOI":"10.1111\/rda.14549","type":"journal-article","created":{"date-parts":[[2024,3,12]],"date-time":"2024-03-12T11:39:17Z","timestamp":1710243557000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Age\u2010related changes in testicular histological structure, testosterone level, libido and semen traits in male Coturnix quail"],"prefix":"10.1111","volume":"59","author":[{"given":"Mohamed","family":"Roshdy","sequence":"first","affiliation":[{"name":"Poultry Breeding Department Agricultural Research Centre, Animal Production Research Institute  Giza Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmed M.","family":"Hanafy","sequence":"additional","affiliation":[{"name":"Faculty of Agriculture, Animal Production Department Suez Canal Universities  Ismailia Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hassan A.","family":"Khalil","sequence":"additional","affiliation":[{"name":"Faculty of Agriculture, Animal Production Department Suez Canal Universities  Ismailia Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Salwa M.","family":"Siam","sequence":"additional","affiliation":[{"name":"Poultry Breeding Department Agricultural Research Centre, Animal Production Research Institute  Giza Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2831-8534","authenticated-orcid":false,"given":"Mohamed E.","family":"Abd\u00a0El\u2010Hack","sequence":"additional","affiliation":[{"name":"Poultry Department, Faculty of Agriculture Zagazig University  Zagazig Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3247-5898","authenticated-orcid":false,"given":"Ayman A.","family":"Swelum","sequence":"additional","affiliation":[{"name":"Department of Animal Production, College of Food and Agriculture Sciences King Saud University  Riyadh Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gamaleldin M.","family":"Suliman","sequence":"additional","affiliation":[{"name":"Department of Animal Production, College of Food and Agriculture Sciences King Saud University  Riyadh Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0089-4393","authenticated-orcid":false,"given":"Vincenzo","family":"Tufarelli","sequence":"additional","affiliation":[{"name":"Department of Precision and Regenerative Medicine and Jonian Area (DiMePRe\u2010J) Section of Veterinary Science and Animal Production University of Bari \u2018Aldo Moro\u2019  Valenzano Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohamed E.","family":"Mady","sequence":"additional","affiliation":[{"name":"Faculty of Agriculture, Animal Production Department Suez Canal Universities  Ismailia Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,3,12]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1071\/an16226"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0043933919000060"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/jpn.13303"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/ani10030372"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469\u20107580.2007.00726.x"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1080\/1828051x.2022.2118625"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/ilar.51.4.310"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anireprosci.2005.12.012"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod57.5.976"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10336\u2010005\u20100031\u20107"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psj.2021.101482"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/rda.13585"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anireprosci.2010.04.008"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.3382\/ps\/pey348"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1530\/jrf.0.1100053"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tice.2021.101650"},{"key":"e_1_2_9_18_1","volume-title":"Hormones and reproduction of vertebrates","author":"Norris D. 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