@CGilbert
If the blue chick is a hen put it under the white roo, if it is a roo put it with the buff hen. After they mate if you get any splash colored chicks then you know that is the blue carrier, if there is no splash chicks then the other parent carries blue.
if your roo is recessive white he can still carry the Bl modifying gene, it just won't express because of the 2 copies of recessive white being present.
If the blue chick is a hen put it under the white roo, if it is a roo put it with the buff hen. After they mate if you get any splash colored chicks then you know that is the blue carrier, if there is no splash chicks then the other parent carries blue.
if your roo is recessive white he can still carry the Bl modifying gene, it just won't express because of the 2 copies of recessive white being present.