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- W2095679040 abstract "The sex of 1, 056 bovine fetuses was diagnosed by cytogenetic analysis of amniotic cells collected surgically from cows made pregnant as a result of embryo transfer. The fetuses ranged in gestational age from 7 to 22 wk at the time of amniocentesis. Amniotic cells were cultured for 5 to 30 d to obtain a sufficient number of cells for cytogenetic analysis. The growth rate of 819 samples was examined in detail. On average, amniotic cells from pregnancies that were 7 or 8 wks old required about 13 d to reach a cell concentration sufficient for analysis, whereas those from pregnancies that were 10 wk old or more required only 10 d or less to reach that concentration. Final disposition of 325 pregnancies subjected to amniocentesis was unequivocally confirmed. Of these, the sex of 302 fetuses (93%) was determined with a male: female ratio of 51:49. The gender of 213 of 220 fetuses (96.8%) was correctly dignosed, as verified by examination of either 33 intentionally induced abortuses or of 187 live calves. Thirteen percent (29) of 216 pregnancies that were allowed to proceed to term ended in spontaneous abortion, a rate only about 5% higher than that reported to occur normally in embryo transfer pregnancies. The remaining 53 pregnancies were induced to abort, but it was not possible to recover and verify the sex of those fetuses. The capability to diagnose fetal sex in utero yielded other useful information as well. For example, the sex ratio of 1,056 fetuses during development from 7 to 15+ wk of gestation was found to be the same (51:49) as it was at calving. Finally, amniocentesis to determine prenatal sex provides time to alter the sex ratio of a calf crop. It may ultimately prove valuable as an adjunct to genetic engineering of cattle to identify presumptive transgenic calves in utero." @default.
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- W2095679040 date "1990-02-01" @default.
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- W2095679040 title "Prenatal diagnosis of sex in bovine fetuses by amniocentesis" @default.
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- W2095679040 doi "https://doi.org/10.1016/0093-691x(90)90510-z" @default.
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