Natural and artificial methods for inducing the luteal phase in the koala (Phascolarctos cinereus)

Johnston, S. D., Mcgowan, M. R., O'Callaghan, P., Cox, R. and Nicholson, V. (2000) Natural and artificial methods for inducing the luteal phase in the koala (Phascolarctos cinereus). Journal of Reproduction and Fertility, 120 1: 59-64. doi:10.1530/reprod/120.1.59

Author Johnston, S. D.
Mcgowan, M. R.
O'Callaghan, P.
Cox, R.
Nicholson, V.
Title Natural and artificial methods for inducing the luteal phase in the koala (Phascolarctos cinereus)
Journal name Journal of Reproduction and Fertility   Check publisher's open access policy
ISSN 0022-4251
Publication date 2000-09-01
Sub-type Article (original research)
DOI 10.1530/reprod/120.1.59
Open Access Status DOI
Volume 120
Issue 1
Start page 59
End page 64
Total pages 6
Editor C. Doberska
Place of publication Cambridge, UK
Publisher Journals of Reproduction and Fertility Ltd.
Language eng
Subject C1
300402 Animal Reproduction
780105 Biological sciences
Abstract An experiment was conducted in which female koalas were mated for different durations of intromission and ejaculation to confirm that the luteal phase of the oestrous cycle in koalas is induced by the physical act of mating. Results showed that induction of a luteal phase in the koala usually required a complete duration of penile thrusting behaviour from the male. It is proposed that induction of a luteal phase in koalas may involve a copuloceptive reflex, triggered by the thrusting of the male's penis into the female's urogenital sinus. Although interrupted mating in koalas may be used to induce a luteal phase in preparation for an artificial insemination programme, this study showed that there is a 12.5% probability that pregnancy will result from semen prematurely emitted by the teaser male. A dose of 250 iu hCG was administered intramuscularly to eight oestrous females to determine whether it was possible to induce a luteal phase artificially. In contrast to control females, which received sterile saline injections, all females injected with hCG showed a significant increase in progestogen concentration above that of basal values, indicating that a luteal phase had been induced successfully.
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 17 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 10 Jun 2008, 22:26:23 EST