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This study was performed on 20 healthy Japanese quail chicks on the day of hatching and 10, 30, and 50 posthatching. The results show the differentiation of cortical germ cells into oocytes and somatic cells into pre-granulosa cells surrounding the oocyte, forming primordial follicles. Primary and secondary follicles develop, with possible atresia. The follicular thecal layers developed, and the interstitial stromal cells close to the follicle differentiate into thecal glands. The ovarian stroma is composed of interstitial glands, intermediate filaments, and lacunar channels. COX2 reacts with ovarian somatic cells differentiated into granulosa and interstitial stroma cells. Alpha Smooth Muscle Actin (\u03b1-SMA) is a marker of myofibroblast cells, while proliferating cell nuclear antigen (PCNA) indicates the oocyte development and growth. Caspase-3 is involved in the apoptosis of atretic follicles. These results advance our knowledge of avian reproduction by giving extensive insight into the posthatching development of the Japanese quail ovary. In conclusion, this research examines structural changes during the growth of ovaries and follicles at various age stages. Future research will broaden the molecular and genetic aspects of the developing ovary.<\/jats:p>","DOI":"10.1093\/mam\/ozag049","type":"journal-article","created":{"date-parts":[[2026,5,31]],"date-time":"2026-05-31T11:34:57Z","timestamp":1780227297000},"source":"Crossref","is-referenced-by-count":0,"title":["Rhythmic Pattern of the Ovarian Development in Posthatching Japanese Quail (\n                    <i>Coturnix coturnix japonica<\/i>\n                    ): Histological, Ultrastructural, and Immunohistochemical Study"],"prefix":"10.1093","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8552-9346","authenticated-orcid":false,"given":"Sara M M","family":"Eldesoky","sequence":"first","affiliation":[{"name":"Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Assiut University , Assiut 71526 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