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. 2023 Oct 29;13(21):3362. doi: 10.3390/ani13213362

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Semithin sections stained by toluidine blue show follicular development. (A) Early oocytes with many nucleoli (black arrowhead) and vacuolated follicles (white arrowheads). (B) Early oocytes (black arrowhead) and late oocytes (white arrowhead). (C) Late oocyte with flat follicular epithelium (white arrowhead). Note the early oocyte (black arrowhead). (D) Yolk globule stage (black arrowhead). (E,F) Mature follicle (white arrowhead). Note zona radiata (black arrowhead) and theca folliculi (asterisk).