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- W2078100377 abstract "The aim of our study was to determine if the oocytes of pregnant cattle are capable for undergoing embryonic growth following in vitro fertilization. The ovaries of nine heifers at 4 to 7 months of pregnancy were collected at an abattoir and transferred to the laboratory. A total 191 oocytes (10.6 per ovary) collected by aspiration were matured and fertilized by frozen-thawed semen. Embryos were co-cultured with granulosa cells in modified TCM 199 medium and 20% estrous cow serum. The cleavage rate of embryos was 48%, and 41% of of the cleaved embryos developed to the morula/blastocyst stage 7 days after insemination. Additionally, the ovaries of 10 nonpregnant heifers were also collected, yielding 213 oocytes (10.7 per ovary). The cleavage rate was 51%, and 35% of those which cleaved reached the morula/blastocyst stage. No significant differences were found between the two groups. The average number of transferable-stage embryos obtained from pregnant and nonpregnant animals was 4.1 and 3.7, respectively. Our results indicate that preganancy does not influence the meiotic competence of bovine oocytes, and transferable stage embryos can be obtained by the fertilization of oocytes derived from pregnant animals." @default.
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- W2078100377 date "1992-04-01" @default.
- W2078100377 modified "2023-10-16" @default.
- W2078100377 title "Embryos derived from the in vitro fertilization of oocytes of pregnant cows" @default.
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- W2078100377 doi "https://doi.org/10.1016/0093-691x(92)90043-q" @default.
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