Intra-uterine distribution of the mouse blastocysts in delayed implantation.
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The distribution of blastocysts in the uterine horn was examined in mice in delayed implantation. Female ICR mice were injected with 5 IU PMSG and 5 IU hCG 48 hrs apart and mated immediately after hCG injection with males of the same colony. The day when vaginal plug were found was des-ignated Day 1 of pregnancy. Intra-uterine distribution of the blastocysts was examined in the follow-ing 5 groups of the females; a) the females ovariectomized on Day 3, having no treatment thereafter and examined on Days 4 and 8, b) those ovariectomized on Day 3, having daily injection of progesterone thereafter and examined on Days 4 and 8, and c) the PMSG and hCG treated females examined on Day 4.<BR>1. When the numbers of blastocysts were compared among the oviductal side, middle region and vaginal side, there were no significant differences in the mice on the Day 4 groups; only the PMSG and hCG treated, ovariectomized, and progesterone-injected ones. In the delayed implanting mice on Day 8, the ovariectomized, and progesterone-injected ones, the blastocysts were predominantly distributed in the vaginal side.<BR>2. When the numbers were compared among the antimesometrial side, middle region and meso-metrial side of uterine cavities, the blastocysts were mostly distributed in the antimesometrial side in the mice on Day 4 of only the PMSG and hCG treated, and the ovariectomized ones and those on Day 8 of progesterone-injected ones. The similar tendency was found in the mice on Day 4 of progesterone-injected ones, though the numbers showed no significant difference. As for the ovariectomized mice on Day 8, the partial distribution of blastocysts in the antimesometrial side was not recognized.
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