Possible auto sexing?

[GeorgiaMay0110]

I bred a Cream Legbar rooster to a Cuckoo Maran. All the chicks are black with a white dot on their head. Is it safe to assume they’re all roosters? Is this auto sexing?

 

[Willawong Hill]

No, because your rooster is also barred. A rooster with two copies of barring will give one copy to each of his offspring regardless of gender. Any of his barred daughters (or your cuckoo marans hens) mated to a non barred rooster will produce sex linked offspring.