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The pattern of egg expulsion/retention was determined in rabbits 24 h after transfer of eggs to the uterus 24-84 h p.c. Nearly all eggs transferred at 24 or 36 h p.c. were expelled into the vagina but from 36 h onwards an increasing proportion was retained in utero, although maximum retention was not recorded until 76-84 h p.c. In rabbits in which both uterine horns were ligated before egg transfer at 12-48 h p.c., egg development was evaluated 24 or 72 h later, or at term. Practically all eggs transferred at 12 or 24 h perished within 3 days; however, from transfers at 36 h 25% of eggs implanted with 40% survival to term, and further improvement in endometrial receptivity occurred by 48 h. These findings reveal a clear time difference between limitations imposed by endometrial and myometrial function on egg development. Limited attempts to create more favourable uterine conditions by means of progesterone treatment were unsuccessful.

Retention and development of eggs transferred to the uterus at various times after ovulation in the rabbit