Quark model with Fractional electric charge is Wrong

Up-Type Quarks are electrically uncharged (0). only Down-type Quarks are electrically charged and have integer electric charge of plus or minus one (+1,-1) $D^{\pm}\to U^0+W^ {\pm}$ . For example Neutron beta decay: $n^0_{(D^+D^-U^0)}\to p^+_{(D^ +U^0U^0)}+W^-$ (only delta baryon is not consisted with my model of quarks with integer electric charge. perhaps quark content of delta baryon is wrong!.)