BOOKER IS DOUBLE GENED FOR BLACK. THAT MEANS HE CANNOT SIRE A CHESTNUT, SORREL, OR PALOMINO FOAL.
BOOKER SIRES MOSTLY BLACK FOALS ( BRED TO ANY COLOR MARE WITH A FEW BAYS, BUCKSKINS, AND GRULLAS ).
FRED TO A BLACK OR BROWN MARE, BOOKER WILL SIRE A BLACK FOAL EVERY TIME.