Testicular histomorphometric patterns and spermatogenesis dynamics of Oecomys bicolor tomes, 1860 (Rodentia: Cricetidae).

Autor: Martins ALP; Department of General Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., Dias FCR; Department of Veterinary, Federal Rural University of Pernambuco, Recife, Pernambuco, Brazil., Oliveira EL; Department of General Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., Rodrigues GAV; Department of General Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., de Avelar GF; Departament of Morphology, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil., de Melo FCSA; Department of Animal Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., Costa KLC; State University of Minas Gerais, Carangola, Minas Gerais, Brazil., da Matta SLP; Department of General Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil.
Jazyk: angličtina
Zdroj: Anatomia, histologia, embryologia [Anat Histol Embryol] 2024 Jul; Vol. 53 (4), pp. e13062.
DOI: 10.1111/ahe.13062
Abstrakt: Although the order Rodentia does not present a high risk of extinction compared to mammals as a whole, several families demonstrate high levels of threat and/or data deficiency, therefore highlighting the need for targeted research and the application of ecological and reproductive data to the development of conservation actions. The order Rodentia, the largest among mammals, includes 9 families, and the family Cricetidae is the most diverse of the Brazilian rodents. In Brazil, 12 of the 16 genera of Oecomys are found. Oecomys bicolor is known in Brazil as the 'arboreal rat' and is, found in dry, deciduous and tropical forests. The mean body weight of Oecomys bicolor was 35.8 g and the gonadal, tubular and epithelial somatic indexes were, 0.53%, 0.47% and 0.37%, respectively. Seminiferous tubules volume density was 89.72% and the mitotic and meiotic indexes corresponded to 8.59 and 2.45 cells, respectively, and the yield of spermatogenesis was 23.83 cells. The intertubular compartment represented 10.28% of the testis parenchyma and around 5% of the interstitial space was occupied by Leydig cells, whose number per gram of testis was 11.10 × 10 7 cells. By evaluating the biometric and histomorphometric characteristics of the testis, there is evidence that this species has a high investment in reproduction. Due to the high contribution of the seminiferous epithelium and the intertubular compartment in this species, compared to the others of the same family, it is possible to infer that the species Oecomys bicolor has a promiscuous reproductive behaviour.
(© 2024 Wiley‐VCH GmbH. Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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