When red cattle are bred with white cattle they produce roan offspring what type of inheritance is this?

Codominance - F1 hybrids show traits of both parents (ie red and white hairs interspersed)

(a) let IrIr = red, IwIw = white & IrIw=roan. IrIw x IrIw = IrIr, IrIw, IrIw & IwIw. So 1 red (25%), 2 roan (50%) & 1 white (25%) in F1

This is a recessive inheritance.