Characteristics of donors, embryos, recipients, and transfer procedures were examined for relationships with establishment of pregnancy. Data were from records of 1202 embryos transferred by the professional staff of a large embryo transfer company. Average pregnancy rate was 74.6%. Variables affecting establishment of pregnancy were service sire, embryo quality, stage of estrous cycle in recipient, quadratic effect of synchrony, and transfer quality. Because the direct or indirect effect of sire must be established at conception, these data demonstrate a latent effect of sire on pregnancy. One would expect the highest pregnancy rate among excellent quality embryos transferred with no delays or complications into recipients that had displayed estrus at the same time or prior to the donor yet were relatively early in their estrous cycles. There also was a tendency for pregnancy rate to decrease with advancing maturity of the embryo.Interval to onset of estrus following treatment with prostaglandin F2α was relatively uniform throughout diestrus,whereas the synthetic analog induced a relatively earlier onset of estrus when administered early in diestrus. Season was the only variable affecting duration of induced estrus; duration was shorter in spring than in fall. © 1987, American Dairy Science Association. All rights reserved.
CITATION STYLE
Coleman, D. A., Dailey, R. A., Leffel, R. E., & Baker, R. D. (1987). Estrous Synchronization and Establishment of Pregnancy in Bovine Embryo Transfer Recipients. Journal of Dairy Science, 70(4), 858–866. https://doi.org/10.3168/jds.S0022-0302(87)80084-X
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