Gofur Md Royhan, Sadi Md Sheikh, Aktar Shabnaz, Khatun Afia, Awal Md Abdul, Alam Md Emtiaj, Rauf Shah Md Abdur, Matsuo Koiochi
Department of Veterinary and Animal Sciences, University of Rajshahi, Rajshahi, Bangladesh.
Department of Anatomy and Histology, Bangladesh Agricultural University, Mymensingh, Bangladesh.
J Adv Vet Anim Res. 2023 Jun 30;10(2):237-243. doi: 10.5455/javar.2023.j674. eCollection 2023 Jun.
The study aimed to account for baseline biometrical and histomorphometric testicular changes in Black Bengal goats during postnatal development.
Black Bengal goats, divided into group I of VII; day 0; 1, 2 weeks; 1, 2, 4, and 6 months of age, respectively, were used in this study.
The biometrical and histomorphometric values of the testis varied significantly ( < 0.05) from postnatal 1-2 months. From day 0 to 2 months, seminiferous tubules, called sex cords, contained simply peripherally placed Sertoli cells and centrally placed gonocytes. Gonocytes, positioned in the center, moved centrifugally in the direction of the basement membrane of sex cords with the advancement of age, transformed into prespermatogonia, and were distributed among the Sertoli cells at the edge of sex cords that make up the basal cell layer in nearly all of the seminiferous tubules by 2 months after birth. Initiation of spermatogenesis, i.e. stratification and lumination of seminiferous epithelium, took place in the 4th months. At 6 months, all types of spermatogenic cells had been identified. The onset of puberty, i.e., the establishment of spermatogenesis, was noticed to have been established at 6 months of postnatal age in Black Bengal goats, as shown by the spermatozoa that were adhered to the ad luminal border of the Sertoli cells and also in the tubular lumen.
This research is the first to document the varying biometrical and histomorphometric measurements of the testis in Black Bengal goats from birth to puberty.
本研究旨在阐明黑孟加拉山羊出生后发育过程中睾丸的基线生物测量和组织形态测量变化。
本研究使用了黑孟加拉山羊，分为七组，分别为出生0天、1周、2周、1个月、2个月、4个月和6个月龄。
出生后1 - 2个月，睾丸的生物测量和组织形态测量值有显著差异（<0.05）。从出生0天到2个月，生精小管（称为性索）仅包含周边放置的支持细胞和中央放置的生殖母细胞。位于中央的生殖母细胞随着年龄的增长沿离心方向朝着性索的基底膜移动，转变为精原细胞前体细胞，并在出生后2个月时分布在构成几乎所有生精小管基底细胞层的性索边缘的支持细胞之间。生精作用的起始，即生精上皮的分层和管腔形成，发生在第4个月。在6个月时，已识别出所有类型的生精细胞。黑孟加拉山羊出生后6个月时出现青春期，即精子附着在支持细胞的顶腔边界以及管腔内，表明生精作用已确立。
本研究首次记录了黑孟加拉山羊从出生到青春期睾丸不同的生物测量和组织形态测量数据。
