Human Reproduction, Vol. 8, No. 1, pp. 97-101, 1993
© 1993 European Society of Human Reproduction and Embryology
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Embryonic morphology and rate of implantation of human embryos following co-culture on bovine oviductal epithelial cells
Northwest Center for Infertility and Reproductive Endocrinology 5800 Colonial Drive, Suite 200, Margate, FL 33063, USA
Correspondence: 1To whom correspondence should be addressed
A study was undertaken to evaluate embryonic development and establish pregnancies with human embryos after in-vitro culture in two different systems. Treatment A consisted of culturing zygotes in serum-supplemented human tubal fluid culture medium (HTF). Treatment B consisted of culturing zygotes on a monolayer of bovine oviductal epithelial cells with HTF. At the time of embryo replacement, embryos in treatment B had 4.11 blastomeres present, which was greater (P < 0.05) than the 3.81 present for embryos in treatment A. In addition, the cellular fragmentation rate for treatment A embryos was 1.10, which was greater (P < 0.05) than the fragmentation rate of 0.38 for embryos within treatment B. The incidence of ongoing pregnancy was higher after replacement of co-cultured embryos (treatment B) (43%) than replacement of conventionally cultured embryos (treatment A) (29%). The implantation rate per embryo increased (P < 0.05) from 11.5 to 18.4% after co-culture. In treatment B the proportion of ‘spare’ embryos developing to expanded blastocysts was 58.5%, which was greater (P < 0.05) than the blastocyst development rate of 29.3% observed for embryos within treatment A.
Key words: co-culture/embryo development/human implantation
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