Studies of male reproduction in the Greater Bilby Macrotis lagotis

Johnston, S. D., Rumph, C., Lucht, M., Stenzel, D., Nicolson, V., Blyde, D. and Keeley, T. (2010) Studies of male reproduction in the Greater Bilby Macrotis lagotis. Australian Zoologist, 35 2: 315-330.

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Author Johnston, S. D.
Rumph, C.
Lucht, M.
Stenzel, D.
Nicolson, V.
Blyde, D.
Keeley, T.
Title Studies of male reproduction in the Greater Bilby Macrotis lagotis
Formatted title
Studies of male reproduction in the Greater Bilby Macrotis lagotis
Journal name Australian Zoologist   Check publisher's open access policy
ISSN 0067-2238
Publication date 2010-04-01
Sub-type Article (original research)
Volume 35
Issue 2
Start page 315
End page 330
Total pages 16
Place of publication Mosman, N.S.W., Australia
Publisher Royal Zoological Society of New South Wales
Collection year 2011
Language eng
Formatted abstract
Despite its vulnerable conservation status there is scant information on male Greater Bilby Macrotis lagotis reproduction. Observations of gross anatomy revealed a testis to body weight ratio of 0.08 - 0.17% (n = 4), the presence of a carrot shaped prostate with an oblique coronal segmentation of ventral and dorsal orientated prostatic tissue, an elongated membranous urethra, two bulbourethral glands and a bifurcated urethra in the glans penis (n = I).The testis contained a high proportion of Leydig tissue (37.5 ± 2.7%) and a seminiferous epithelial cell cycle (8 stages identified) with a predominance of pre-meiotic stages (61.4%) and Sertoli cells with unusually large nuclei. A GnRH stimulation test conducted on four different intact sexually mature Bilbies using 2μg Buserelin resulted in maximal plasma androgen secretion 30 to 60 mins after injection. While steps of M. lagotis spermiogenesis were similar to those described in peramelid marsupials, the morphology of the Bilby spermatozoan at spermiation,was radically different to that of the bandicoot sperm cell. Similar to the bandicoot, M. lagotis spermatozoa in the corpus epididymidis dislocated their neck insertion from the primary implantation fossa, so that by the time the sperm cell had reached the cauda epididymidis, the acetabulum had migrated cranially Into a secondary implantation fossa and the nucleus had become streamlined with respect to the flagellum.This study reports the first description of large crystalloid inclusions in the principal cells of the caput epididymidal epithelium, the significance of which remains unknown. Male Bilby reproduction reported in this study supports the present taxonomic position of the Thylacomyidae.
Keyword Greater Bilby
Thylacomyidae
Gross reproductive anatomy
Testicular histology
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Wed, 09 Mar 2011, 23:18:41 EST by Associate Professor Stephen Johnston on behalf of School of Animal Studies