title: Seasonal changes in the seminiferous epithelium of rhesus and bonnet monkeys.
abstract: With a view to elucidate seasonal variations in testicular spermatogenesis, quantitative analysis of spermatogenic cells was carried out in non-human primate species viz. rhesus (Macaca mulatta) and bonnet (M. radiata) monkeys during breeding (October-December) and non-breeding (May-June) seasons. The results revealed significant inhibition of testicular germ cell population during non-breeding compared with the breeding period in both the species. Quantitative determination of Sertoli cell-germ cell ratio showed a marked decrease in the number of type A-spermatogonia, spermatocytes (non-pachytene and pachytene) and spermatids (in steps 1-12 of spermiogenesis) in rhesus monkey during the non-breeding period. Bonnet monkeys exhibited the significant decline in the number of primary spermatocytes and spermatids during the non-breeding phase. In addition, average diameter of round seminiferous tubules and nuclear diameter of Leydig cells also decreased significantly in rhesus monkeys. However, bonnet monkeys did not show any significant change in nuclear diameter/morphology of Leydig cells, testicular tubular diameter and number of type A-spermatogoniae. Sertoli cell number did not show any significant change during both breeding and non-breeding periods in both the species. The results of this study indicate a prominent seasonal variation in testicular spermatogenic/Leydig cells in rhesus monkeys than those observed in bonnet monkeys.
authors.affiliation: Division of Endocrinology, Central Drug Research Institute, Lucknow, India. bansodefw@rediffmail.com
authors.forename: F W
authors.initials: FW
authors.lastname: Bansode
authors.forename: S R
authors.initials: SR
authors.lastname: Chowdhury
authors.forename: J D
authors.initials: JD
authors.lastname: Dhar
mesh_terms: D000818:Animals; D004848:Epithelium / Q000502:physiology*; D008253:Macaca mulatta / Q000033:anatomy & histology / Q000502:physiology*; D008255:Macaca radiata / Q000033:anatomy & histology / Q000502:physiology*; D008297:Male; D012621:Seasons; D012671:Seminiferous Tubules / Q000033:anatomy & histology / Q000166:cytology / Q000502:physiology*; D013091:Spermatogenesis / Q000502:physiology