Investigation of the morphological and histological features of the testes of pigeon (Columba livia domestica) in pre-puberty and post-puberty.

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Morphological and histological examination of the testes can provide a suitable insight into the health of the reproductive system. The objective of the current study was to investigate the morphological and histological features of the testes of local pigeons (Columba livia domestica) at mature and immature stages of age. Two groups of collected specimens underwent macroscopic and microscopic investigation to evaluate and compare the main general properties of their testes. The findings indicated that the testis has an oval shape in both pre-puberty and post-puberty stages, situated on the inner side of the kidney towards the caudal extreme of the lungs. However, the left testis was bigger than those on the right side. In the pre-puberty stage group, the testicular parenchyma was small, and almost collapsed seminiferous tubules containing a single layer of Spermatogonia and Sertoli cells. In contrast, in the post-puberty stage, the parenchyma space between seminiferous tubules was small, and tubules adhered closely to each other. Also, mature cells including sertoli, spermatogonia, and spermatocytes were noticed to spread within the tubules. The change in the histological structure of testes before and after maturity may help to evaluate the complexity of the male reproductive system of pigeons and draw attention to the organization of sex hormones and the function of several types of cells within the testes.