Abstract
This study was conducted on 53 samples of female local Kurdi goats uterus contained one or two fetuses .These samples were collected from Sulaimani slaughter house, A total of 53genitlia were consisted of 36 (67.92%)single and 17(32.08%)twin fetuses ,with a total of 70 fetus,of them 33(47.14%) and 37(52. 86%) were located in the right and left horns, respectively. The number of fetuses with macroscopically clear external sex organ was 55, the total number of male fetuses was 34(48.57%) while the female was 21(30%).The fetuses whose external organ could not be diagnosed were 15(21.42%). The weight of the fetal testes and the length of scrotum were increased steadily with an increasing in the fetal Crown Rump Length(CRL). When the CRL is 2.5-5cm testes location is close to the kidney, while testes are located in the inguinal ring and/or scrotum at about20-23 and 28cm.Histological sections of testes showed the density of fibroblast layer and connective tissue capsules as well as the appearance of seminiferous tubles containing a few spermatogonia cells and small leydig cells at early stages of CRL=8cm. With an increasing in CRL , the seminiferous tubules filled with different types of spermatogonia cells, spermatocytes cells ,increasing in number and size of sertoli and leydig cells. Different Types of spermatid were also present in sections of more than 20cm CRL. The study indicated that the fetal testes secreted testosterone hormone which is essential for testes development and descending
Highlights
In the adult male of many mammalian species, libido and testicular function, which are thought to be mediated through alterations in gonadotrophin secretion from the pituitary gland
The development and function of the testes in sheep fetuses are known to be critically depends on circulating fetal gonadotrophin concentration (1)
The weight of fetal goat testes is increased about 8 times between days 60-80 of gestation period,during this time sertoli cells, leydig cells, and spermatogonia appear in histological picture, the weight was increased 4 times between days 100-140 of gestation ( 3).Amann (4)reported that the weight of testis is related to the nutritional levels but not to the age
Summary
In the adult male of many mammalian species, libido and testicular function, which are thought to be mediated through alterations in gonadotrophin secretion from the pituitary gland. The development and function of the testes in sheep fetuses are known to be critically depends on circulating fetal gonadotrophin concentration (1). It is clear that the testis is capable of prouducing various androgen in sheep fetus (2.). The weight of fetal goat testes is increased about 8 times between days 60-80 of gestation period ,during this time sertoli cells, leydig cells, and spermatogonia appear in histological picture, the weight was increased 4 times between days 100-140 of gestation ( 3).Amann (4)reported that the weight of testis is related to the nutritional levels but not to the age. The faster growth stage is between 70-100 days of postnatal life. Monet-Kuntz, et al(5) reported after birth the seminferious are small, inactive and closed, after 95 days of age they grow and develope. There was no data available considering the size, location, of fetal testes as well as the histological study of the development of the fetal testes in goats, The present study is designed to investigate the histological development of fetal testes., to determine its location, size, and migration of fetal testes goats throughout intra uterine life
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