Reproductive physiology of the female greater bilby (Macrotis lagotis Thylacomyidae): Evidence for a male-induced luteal phase

Ballantyne, K., Matson, P., Noakes, N., Nicolson, V. and Johnston, S. D. (2009) Reproductive physiology of the female greater bilby (Macrotis lagotis Thylacomyidae): Evidence for a male-induced luteal phase. Reproduction, Fertility and Development, 21 2: 274-282. doi:10.1071/RD08134


Author Ballantyne, K.
Matson, P.
Noakes, N.
Nicolson, V.
Johnston, S. D.
Title Reproductive physiology of the female greater bilby (Macrotis lagotis Thylacomyidae): Evidence for a male-induced luteal phase
Formatted title
Reproductive physiology of the female greater bilby (Macrotis lagotis Thylacomyidae): Evidence for a male-induced luteal phase
Journal name Reproduction, Fertility and Development   Check publisher's open access policy
ISSN 1031-3613
1448-5990
Publication date 2009-01-27
Year available 2009
Sub-type Article (original research)
DOI 10.1071/RD08134
Volume 21
Issue 2
Start page 274
End page 282
Total pages 9
Editor T. Flint
Place of publication Melbourne, Australia
Publisher CSIRO Publishing
Collection year 2010
Language eng
Subject C1
969999 Environment not elsewhere classified
060803 Animal Developmental and Reproductive Biology
Abstract Endocrinology of the oestrous cycle, pregnancy and early lactation was investigated in captive Western Australian greater bilbies (Macrotis lagotis). Initially, six females were monitored for changes in urogenital cytology, plasma progestogen, pericloacal and pouch morphology in the absence of a male. This was followed by the introduction of a male and a reproductive assessment through mating, gestation and early lactation. In the absence of a male, there was no cyclical pattern of urogenital cytology, pericloacal or pouch development, and progestogen concentrations remained basal. Within 5 days of the introduction of a male, all females had a karyopycnotic index of 100%. Spermatozoa were present in the urogenital smear within 3 days of male introduction in all five females that gave birth. Five to 9 days after the introduction of a male, there was an increase in plasma progestogen concentration that remained elevated for 14–19 days. Six of the seven females gave birth approximately 3 days after reaching peak plasma progestogen concentrations. Gestation length ranged between 14 and 17 days. Plasma progestogen concentrations of the postpartum and early lactation period were lower (P < 0.0001) than during gestation, but greater (P < 0.0001) than those recorded before the introduction of a male. One female that gave birth early in the study that was examined until weaning of the pouch young showed a cyclical pattern of plasma progestogen secretion that ended at weaning. This study provides evidence that the luteal phase in the greater bilby is induced by the presence of a male. Similar to female reproductive physiology in the Peramelidae, elevated progestogen concentration in the greater bilby was extended into lactation.
Keyword Copulation
Faecal
Gestation
Lactation
Plasma
Progestogen
Urogenital cytology
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Agriculture and Food Sciences
 
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Created: Thu, 03 Sep 2009, 08:54:19 EST by Mr Andrew Martlew on behalf of School of Animal Studies