Macropus eugenii exhibits embryonic diapause after fertilization at post partum oestrus. The embryo becomes dormant at the blastocyst stage in response to the suckling stimulus of a young in the pouch during the breeding season and embryonic diapause continues during the non-breeding season in the absence of the suckling stimulus. Dormant blastocysts resumed development when progesterone was injected daily for 3 days. Normal dormant blastocysts were recovered from animals up to 30 days after complete ovariectomy, and progesterone-induced resumption of development occurred in blastocysts up to 21 days after ovariectomy. The termination of embryonic diapause in progesterone-injected marsupials is discussed in relation to the hormonal control of delayed implantation in eutherian mammals.
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