Survival of Porcine Embryos after Asynchronous Transfer

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Abstract
Forty gilts and sows were used to transfer day-5 embryos into 1 uterine horn, while day-7 embryos were transferred into the other horn, day-6 nonpregnant recipients (day 0 = 1st day of estrus). The survival of the transferred embryos was determined on day 11 (1) and days 60-70 (2). The percentage of day-5 and-7 embryos surviving the transfer procedures on day 11 was not different, 42 .+-. 10 and 43 .+-. 12, respectively. By midgestation (day 60), more (P < 0.001) fetuses that developed from day-7 embryos survived than fetuses that developed from day-5 embryos, 63 .+-. 8 and 8 .+-. 7%, respectively. The presence of embryos more advanced in development caused the demise of younger embryos sometime between days 11 and 60 of gestation.

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