Department of Zoology, Australian National University, Canberra 2600, Australia
(Received 13 May 1974)
PAGE
Introduction 589
The oestrous cycle 590
Control of quiescence 592
Role of the corpus luteum 592
Lactational quiescence 592
Seasonal quiescence 592
Role of the pituitary 594
Patterns of breeding in Macropodidae 596
Control of pregnancy 599
The free vesicle stage 599
The control of diapause 599
Activation and maintenance of the embryo 599
Role of the uterus 602
Uterine secretions 602
Diapause and delayed implantation 604
Attachment stage 604
Determination of gestation length 605
Foeto-placental influence 605
Non-macropodid marsupials 606
The Macropodidae 607
Parturition 609
Role of the corpus luteum 609
Role of the pituitary 610
Conclusion 610
References 611
Two features distinguish reproduction in the Macropodidae from all other marsuppials. A period of embryonic diapause of variable duration may supervene after blastocyst formation, and the duration of pregnancy is
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