Intra-Uterine Migration and Mixing of Embryos in Swine Following Egg Transfer

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Abstract
Eggs were recovered in vivo in a modified Tyrode's solution from 29 donor gilts and transferred to 27 unmated recipients. Ovulation time of donors and recipients was synchronized. Eggs from B donors were transferred to the left oviduct or upper uterine horn, and eggs from W donors were transferred to the right side in 18 gilts. When the uteri and fetal contents were examined at about 90 days of gestation, migration of one or more eggs from one horn to the other had occurred in all (14) of the pregnant animals. Mixing of embryos from the two different sides occurred in 9 of 11 gilts in which both B and W fetuses survived to examination. Eggs were transferred to one uterine horn only in nine gilts. Five of these nine were pregnant when examined at 21 days of gestation. Two had embryos in both uterine horns and three had embryos in only one horn. Of 263 eggs transferred 110 (42%) developed into fetuses. Of 184 eggs transferred to recipient gilts which were pregnant at examination, 60% had developed into fetuses. Egg transfer can be used effectively in studies on implantation and other aspects of swine reproductive physiology.

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