I have had both Cals and NZW and you should not have a mixed colored litter if they are purebreds. Even if you bred a cal to a nz, which I have done, awesome meat cross, they will all look like cals with their ear, nose etc coloring being a bit lighter. Right now we have Florida Whites, another awesome meat breed, but a little smaller, and easier for my son, who started showing them last year at 10, to handle then the big cals and nz. Plus they take up less room, a good thing for us right now.