A) Primary spermatocytes (40X); B) Secondary spermatocytes
(40X); C) Spermatids (40X); D) Spermatozoa (40X); E) Spermatozeugmata (20X).
Marked decrease in the germ cell counts specially the number of secondary spermatocytes
and rounded spermatid reduced the testis weight (Bone et al., 2000).
In contrast, GSI values of testes showed that the mature stages are covered in the season of summer with increase in temperature and also raise the spermatogenetic activity whereas, the primary and secondary spermatocytes
and spermatids were filled in the lumen of lobules.
Reproductive classes: The reproductive stages of the spermatogenesis (spermatogonia, primary and secondary spermatocytes
, spermatids and spermatozoa) are a commonly used indicator for depicting reproductive cycles (Grier & Taylor, 1998; Wallace & Selman 1989; Uribe et al.
Males The gonads of immature males (n=11) were small and compact and while contained the basic structure of an immature female, also had crypts of primary and secondary spermatocytes
and spermatids (Fig.
The testicles of adult intersex goats showed normal seminiferous tubules, primary and secondary spermatocytes
and interstitial cells of Leydig.
tuberosum derive from established times for secondary spermatocytes
, testis spermatids and epididymis sperm assessment (Oakberg 1956).
The sertoli cells, spermatogonia, secondary spermatocytes
and spermatids were counted under 100x magnification.
During first meiotic division, the X and Y, in spite of the kinds of pairing involving XR and Y, remain together until early anaphase, at which time they segregate and move to opposite poles, giving rise to two kinds of secondary spermatocytes
with neo-X or neo-Y, but with the same chromosome number.
Sertoli cells, spermatogonia, primary spermatocytes, secondary spermatocytes
and round spermatids were count ed under 100* magnification using ocular and stage micrometer from twenty randomly selected seminiferous tubules from each slides.
In spermatogenesis, primary spermatocytes are undergoing meiosis I, which gives rise to secondary spermatocytes
. Secondary spermatocytes
undergo meiosis II to give rise to spermatids.
Few secondary spermatocytes
with karyolytic nuclei can be seen.