~ 30% B6D2F1 male mice demonstrate steroid-independent male sex behavior (SI-MSB).
Elevated APP, tau, and synaptophysin impact SI-MSB.
SI-MSB was found to be a heritable trait.
This trait is passed down mainly from B6D2F1 mice that demonstrate SI-MSB.
APP, tau, and synaptophysin were higher in B6D2F1 males and sires that show SI-MSB.