Spermiogenesis in the cattle egret (Bubulcus ibis)

dc.contributor.authorRoopnarine, Narindra H.
dc.contributor.authorGupta, Sunil K.
dc.contributor.authorDu Plessis, Lizette
dc.contributor.authorAire, Tom A.
dc.contributor.emaillizette.duplessis@up.ac.zaen_US
dc.date.accessioned2022-09-07T05:40:18Z
dc.date.available2022-09-07T05:40:18Z
dc.date.issued2021-02
dc.description.abstractAvian species comprise more than half of all vertebrates yet there is a dearth of information regarding spermatid development in this class of animals. This report of spermiogenesis in the cattle egret, Bubulcus ibis, is the first in the order Pelecaniformes. Five sexually mature and reproductively active male cattle egrets were captured in the wild, humanely euthanized, the reproductive organs dissected out, and tissues from the testes routinely prepared for transmission electron microscopy. Twelve steps of spermatid development, using the step-wise system, were determined. Acrosomogenesis in the egret results in a relatively short, solid, bullet-shaped acrosome that ends bluntly anteriorly and flat posteriorly or basally. The nucleus displays remarkable morphological changes, with the anterior end of the mature spermatid becoming flat, lacking a rostrum and an endonuclear canal. A perforatorium does not develop. It is noteworthy that a longitudinal, but not a circular, manchette develops during spermiogenesis in this bird. The proximal centriole is attached to the nucleus, at the implantation fossa, by means of well-formed, electron dense struts of material. An amorphous fibrous sheath develops in the principal piece. The interesting development and peculiar features of the acrosome and nucleus, as well as the absence of the perforatorium and circular manchette in the spermatozoon of the cattle egret, may be of phylogenetic significance.en_US
dc.description.departmentAnatomy and Physiologyen_US
dc.description.librarianhj2022en_US
dc.description.sponsorshipThe Small Research Grant Initiative of St George’s University.en_US
dc.description.urihttps://www.elsevier.com/locate/ticeen_US
dc.identifier.citationRoopnarine, N.H., Gupta, S.K., Plessis, L.D. et al. 2021, 'Spermiogenesis in the cattle egret (Bubulcus ibis)', Tissue and Cell, vol. 68, art. 101457, pp. 1-10, doi : 10.1016/j.tice.2020.101457.en_US
dc.identifier.issn0040-8166 (print)
dc.identifier.issn1532-3072 (online)
dc.identifier.other10.1016/j.tice.2020.101457
dc.identifier.urihttps://repository.up.ac.za/handle/2263/87092
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights© 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.en_US
dc.subjectCattle egret (Bubulcus ibis)en_US
dc.subjectMorphogenic variationsen_US
dc.subjectPelecaniformesen_US
dc.subjectSpermatid differentiationen_US
dc.subjectUltrastructureen_US
dc.subjectWild non-passerineen_US
dc.titleSpermiogenesis in the cattle egret (Bubulcus ibis)en_US
dc.typeArticleen_US

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