性染色体キメラ（ＸＸ／ＸＹ）を有しながらも受胎した異性双子雌牛の一例

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  • A fertile case of bovine heterosexual twin female with sex chromosomal chimerism(XX/XY).

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A heterosexual twin female in cattle which showed the vital signs of being in heat at 10 month old, had a sex chromosomal chimerism (XX/XY). By embryo transfer, this heifer was fertilized and gave birth to a stillborn calf at full term. From these results obtained, this case was certified as a " fertile bovine heterosexual twin female with sex chromosomal chimerism (XX/XY) " . It seems that a choriovascular anastomosis in the fetal membrane of the developing heterosexual fetuses occurred after a critical point of differentiation of fetal ovary.

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