Donor and recipient rat strains affect full-term development of one-cell zygotes cultured to morulae/blastocysts

Megumi Kato, Ayako Ishikawa, Shinichi Hochi, Masumi Hirabayashi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The present study was conducted to examine the developmental potential to offspring of rat embryos cultured from 1-cell to morula/blastocyst stage. Pronuclear zygotes from Wistar × Wistar or (SD × DA) × Wistar strains were cultured in modified rat 1-cell embryo culture medium (mR1ECM) for 96 h in 5% CO2 in air at 37 C. The proportion of the 3-way cross hybrid zygotes developing into morula/blastocyst stage (74%) was higher than that of the Wistar zygotes (66%). Day-5 morulae/ blastocysts developed in vitro were transferred into Day-3 or -4 pseudopregnant recipients of Wistar or SD × DA strain. The transfer of cultured embryos resulted in the birth of offspring at 13-59%, while that of non-cultured control blastocysts showed birth rates of 35-65%. The best offspring rate of cultured embryos (59%) was obtained when the hybrid 1-cell zygotes were cultured in mR1ECM medium and transferred into the 2-days earlier uteri of SD × DA recipients. These results suggest that genetic background of recipients as well as donors is a possible factor affecting full-term development of rat morulae/blastocysts derived from 1-cell stage zygotes cultured in vitro.

Original languageEnglish
Pages (from-to)191-195
Number of pages5
JournalJournal of Reproduction and Development
Issue number2
Publication statusPublished - 2004
Externally publishedYes


  • Embryo transfer
  • Hybrid
  • In vitro culture
  • Rat zygotes
  • mR1ECM

ASJC Scopus subject areas

  • Animal Science and Zoology


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