XX/XY Chimerism in Tortoiseshell Tomcats: A New Case and Literature Review

    March 2026 in “ Sexual Development
    Izabela Szczerbal, Joanna Nowacka-Woszuk, M. Świtoński
    Studysummary This study found that a young male Maine Coon cat with a tortoiseshell coat, which typically indicates unusual sex chromosomes, was fertile, carrying both XX and XY cell lines. The researchers recommend genetic testing for tri-colored male cats before breeding decisions.
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