title: Stages and duration of the cycle of the seminiferous epithelium in oncilla (Leopardus tigrinus, Schreber, 1775).
abstract: Six adult Leopardus tigrinus (oncilla) were studied to characterize stages of the seminiferous epithelium cycle and its relative frequency and duration, as well as morphometric parameters of the testes. Testicular fragments were obtained (incisional biopsy), embedded (glycol methacrylate), and histologic sections examined with light microscopy. The cycle of the seminiferous epithelium was categorized into eight stages (based on the tubular morphology method). The duration of one seminiferous epithelium cycle was 9.19 d, and approximately 41.37 d were required for development of sperm from spermatogonia. On average, diameter of the seminiferous tubules was 228.29 μm, epithelium height was 78.86 μm, and there were 16.99 m of testicular tubules per gram of testis. Body weight averaged 2.589 kg, of which 0.06 and 0.04% were attributed to the testis and seminiferous tubules, respectively. In conclusion, there were eight distinct stages in the seminiferous epithelium, the length of the seminiferous epithelium cycle was close to that in domestic cats and cougars, and testicular and somatic indexes were similar to those of other carnivores of similar size.
authors.affiliation: Veterinary Department, Federal University of Viçosa, Minas Gerais 36571-000, Brazil.
authors.forename: Maytê Koch
authors.initials: MK
authors.lastname: Balarini
authors.forename: Tarcízio Antônio Rego
authors.initials: TA
authors.lastname: de Paula
authors.forename: S L Pinto
authors.initials: SL
authors.lastname: da Matta
authors.forename: J Vogas
authors.initials: JV
authors.lastname: Peixoto
authors.forename: F Lima
authors.initials: FL
authors.lastname: Guião-Leite
authors.forename: J L
authors.initials: JL
authors.lastname: Rossi Júnior
authors.forename: A C
authors.initials: AC
authors.lastname: Czermak Junior
authors.forename: N J
authors.initials: NJ
authors.lastname: Walker
mesh_terms: D000818:Animals; D001835:Body Weight; D001938:Brazil; D045989:Felidae / Q000033:anatomy & histology* / Q000502:physiology*; D008297:Male; D009929:Organ Size; D012670:Seminiferous Epithelium / Q000166:cytology* / Q000502:physiology*; D012671:Seminiferous Tubules / Q000033:anatomy & histology / Q000502:physiology; D012708:Sertoli Cells / Q000648:ultrastructure; D013087:Spermatids / Q000648:ultrastructure; D013090:Spermatocytes / Q000648:ultrastructure; D013091:Spermatogenesis; D013093:Spermatogonia / Q000648:ultrastructure; D013094:Spermatozoa / Q000648:ultrastructure; D013737:Testis / Q000033:anatomy & histology / Q000737:chemistry