Histological and Histochemical Studies on the Prenatal Development of Testis in Goat (Capra hircus)

Abstract

studies on the prenatal development of testis in goat (Capra hircus). Int. J. Morphol., 30(4):1408-1421, 2012. SUMMARY:The study has been conducted on the prenatal development of testis on 70 goat embryo/foeti, categorized into group-I (0-30 days), Group-II (31-60 days), Group-III (61-90 days), Group-IV (91-120 days) and group V (121days-till birth), having 14 embryos/ foeti in each group. The genital ridge was observed at 23 days of gestation. It contained an accumulation of mesenchymal cells, immature RBC's, differentiating fibroblasts and primordial germ cells. The formation of sex cords was evidenced on 44 th day of gestation. It contained small mesenchymal cells and large cells arranged in a chain like manner. The convolution of the sex cords started between 61-90 days of gestation, which increased with the increase in the gestation period and at 125 day of gestation few sex cords attained the form of reverse question mark. The sustentocytes (Sertoli cells) were observed among the small cells of sex cords at 56 th day of gestation. The tunica albuginia appeared just beneath the germinal epithelium at 44 th day of gestation. It consisted of 2-4 layers of mesenchymal cells, fibroblasts and small capillaries. The thickness of tunica albuginia increased with the increase in the age of foetus and between 61-90 days of gestation, the outer thick fibrous and inner thin vascular layer could be demarcated separately. Few mesenchymal cells start differentiating into interstititial endocrine cells (Leydig cells) located in the interstitial spaces at 44 th day of gestation.

Development of spermatogonial stem cell niche and immunoexpression of vimentin filaments in the testes of prenatal and postnatal Indian buffalo (Bubalusbubalis)

“…At places around the BM, PMCs were seen. Similar findings were reported by Kaur et al [13] and Singh et al [14] in buffalo, in goat [15], and by Basavaiah in sheep [12] at 69 days of gestation. The BM consisted of mainly collagen fibers ( Figures 1J and 1K).…”

comparative morphological study of the accessory sex glands of immature and mature local breed donkey (Equus asinus)

“…On the other hand in local breed donkey the prostate had stable position, so this result disagrre with reports of Marty et al, (2003) and Manuel andFrancisca (2019, Smith (2008), Evans, and De Lahunta, (2013) whom mentioned that in male dogs, the prostate glands is seen in the pelvic region, while in mature dogs will become abdominal as the prostate enlarges in older dogs. The current study showed that the prostate of local breed donkey was without disseminate part, such result is similar some mammals species such as horse (Dyce et al, 2009), tomcat (Abood et al, 2019), and current result dissimilar prostate of ram, buck and camel at which gland is consisted of only disseminate parts which extending along the pelvic urethra (Khalaf, 2009;Farooqui, 2004;Gofur, 2015), in one-humped camel the prostate gland it is the largest accessory sex gland consisted of a dorsal body and ventral disseminate part overlying the prostatic urethra (Mahmud et al, 2016), while in adult bull the prostate has body and disseminate part (Hassan, 2021;Adhikary et al, 2015) , the prostate gland of gazelle is consisted of disseminated part only (Mohammed and Doohi 2017).There significant differences between the dimensions of adult prostate and those in immature, the dimension of prostate in adult donkey similar that recorded by Hassan (2021) in bull which showed lower dimensions, while the prostate gland in stallion is larger (5-8 cm) in long, (2-3 cm) in wide and (1-2 cm) thick (Davies, 2003;Dascanio and McCue, 2014).…”

Microanatomical Study of Embryonic Gonadal Development in Japanese Quail (Coturnix japonica)

“…In male embryos, the structure of testicular cords of 14-day-old embryos was well delineated. The basement membrane of such cords was demarcated by Mallory-AZAN stain [ 40 ] and therefore this method is being used to study the formation of male cord as well as collagen fibers [ 57 , 58 ]. The results showed that the connective tissue underlying testicular cord epithelium was stained deep blue, demonstrating extracellular materials of the cord.…”