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REGIONAL DIFFERENCES WITH RESPECT TO BLASTOCYST SURVIVAL AND IMPLANTATION EFFECTED BY LOCATION OF LIGATURES IN SEVERAL REGIONS OF THE RAT UTERUS

Summary.: Surgical silk thread sutures were placed in different sites along the antimesometrial wall of the uterine horns of Long Evans female rats. Fertilization was not affected significantly in any rat. A suture placed in the middle of the horn completely prevented pregnancy, whereas sutures at the ovarian or cervical ends of the horns did not affect pregnancy. The results indicate that the location of the suture is important for the complete prevention of pregnancy.