Abstract
The efficiency of spermatogenesis and degenerations of different spermatogenic cells under normal conditions of the environment have been investigated in rams. The meiotic divisions and the position of first-generation spermatids in haematoxylin-eosin stained testicular preparations were used to identify eight stages of the seminiferous epithelial cycle (SEC). The stages of relatively long duration (i.e., 1,2,3,4,8) were sub-divided. The percent-ages of frequency for the 14 stages reported were also studied. Three generations of type A (A 1, A 2, A 3), one generation of type intermediate (In) and two generations of type B (B 1, B 2) spermatogonia were recognized. A 2 and B 2 spermatogonia as well as primary and secondary spermatocytes did not degenerate. Contrarily, A 1, A 2, A 3, In and B 1 spermatogonia showed 25, 13.7, 27.3 and 21.2% degenerations respectively. We concluded that compared with the previously used eight-stage classification, subdividing stages with long durations as done in this study facilitates investigating the degenerations of spermatogenic cells. The efficiency of spermatogenesis in rams was 47.58% since one A 3 spermatogonium produces 30.45 spermatids/spermatozoa against the expected number of 64.
Published Version
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