Retention of blastocysts in nonprogestational uteri of mice

Smithberg, Morris; Runner, Meredith N.

doi:10.1002/jez.1401430103

Cited by 34 publications

(23 citation statements)

References 22 publications

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“…Smithberg & Runner (1960) have obtained somewhat different results in prepuberal, but sexually competent, mice. They recovered blasto¬ cysts from ovariectomized mice as late as Day 46 p.c., but could induce implan¬ tation no later than Day 31 p.c.…”

Section: Discussionmentioning

confidence: 91%

Blastocyst Survival in Ovariectomized Rats

Gd¹

1969

Reproduction

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Implantation did not occur at the usual time in rats ovariectomized on Days 1,2,3 or 4 post coitum (p.c.), but could be induced subsequently by injections of progesterone and oestrone, begun in some instances as late as Days 12, 14, 18 and 8 p.c., respectively. Normal numbers of implantation sites were found in most animals when injections were begun on or before Day 8 p.c. Thereafter, the number of rats with implantation sites and the number of sites observed in each rat declined. The interval after ovariectomy during which blastocysts were recovered from rats not receiving hormones corresponded with the period when implantation could be induced, suggesting that blastocysts remained viable for as long as they survived.

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Section: Discussionmentioning

confidence: 91%

Blastocyst Survival in Ovariectomized Rats

Gd¹

1969

Reproduction

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“…The animals mated the following night. The eggs were fertilized and developed but the blastocysts did not implant until progesterone was administered to the animals (Smithberg & Runner, 1960).…”

Section: Animalsmentioning

confidence: 99%

Ovulation Induced by Gonadotrophins in the Marsupial, Sminthopsis Crassicaudata (Gould)

Smith¹,

Godfrey²

1970

Reproduction

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Summary. Injection of hcg into mature, female S. crassicaudata induced ovulation in three of six animals, whereas injection of pmsg or of pmsg followed after 48 hr by hcg induced ovulation in all of seventeen females. Seven mated but none littered.Ten adult females were injected with pmsg and hcg at the end of an induced oestrous cycle, when the corpora lutea were degenerate. Six mated but none littered. Of eight young females injected with pmsg and hcg, four mated but again none littered. All ova recovered after induced ovulation were unfertilized.The number of ova released at induced ovulation was higher than in untreated animals and many unruptured follicles became luteinized. Ova were retained in the oviducts for longer than normal.

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“…In intact prepuberal mice normal embryonic development occurs only if blasto¬ cysts are delayed 10 days or less (Smithberg & Runner, 1960). One possible explanation for the loss of viability following delay of more than 10 days under these various conditions is that the blastocysts may be depleted of reserves of stored nutrients.…”

Section: Blastocyst Recovery and Transfermentioning

confidence: 99%