These stages comprised the spermatogonia, 5 stages of spermatocytes, the secondary spermatocytes
, 5 stages of spermatids, and the spermatozoa.
Marked decrease in the germ cell counts specially the number of secondary spermatocytes
and rounded spermatid reduced the testis weight (Bone et al.
Based on cell size and nuclear characteristics, the present study revealed 10 stages of spermatogenic cells: spermatogonia, 5 stages of primary spermatocyte, secondary spermatocyte
, 2 stages of spermatid, and spermatozoa.
Few secondary spermatocytes
with karyolytic nuclei can be seen.
After several divisions they give rise to cysts of secondary spermatogorila that enter meiosis to produce successively primary and secondary spermatocytes
Rounded spermatids have a nucleus similar in shape and staining properties to that of secondary spermatocytes
, but they are smaller (1.
In recrudescence, there was renewal of spermatogenic cells characterized by spermatogonial divisions and primary and secondary spermatocytes
were occasionally present.
are abundant, a few spermatids may be present; (3) Late recrudescence, secondary spermatocytes
and spermatids predominate; no sperm are present; (4) Early spermiogenesis, clusters of metamorphosing spermatids line portions of the lumina of the seminiferous tubules, occasional spermatozoa are seen; (5) Spermiogenesis, borders of seminiferous tubules are lined by rows of metamorphosing spermatids and spermatozoa are abundant.
In secondary spermatocytes
, heterochromatin is present in peripheral areas of the nucleus, forming occasional projections towards its center.
Primary and secondary spermatocytes
and spermatids were occasionally present.
Males followed a seasonal testicular cycle (Table 1) in which three stages were represented: (1) Regression (non-reproductive) in which the germinal epithelium is exhausted and the predominant cells are Sertoli cells and spermatogonia; (2) Recrudescence (recovery) characterized by renewal of the germinal epithelium for the next period of sperm formation; primary and secondary spermatocytes
are the predominant cells; (3) Spermiogenesis (sperm production) in which the seminiferous tubules are lined by clusters of spermatozoa and metamorphosing spermatids; the epididymides are packed with sperm.