sport marans:

[NatJ]

I got a BCM hen that as a chick had the penguin suite, black body with white chest.
Now that I have bred her to a dark BCM rooster, I'm getting white chicks with black flecks, almost like dominant white with black co dominance.
Is this a "sport" too?
any one else?

It typically works better to start a new thread and include some pictures.

Also, when you use abbreviations, please write it out in full at least once. In this case, BCM is a common abbreviation for Black Copper Marans and Blue Copper Marans and Blue Cuckoo Marans. Depending on which ones you have, there might be very different explanations for the color of the chicks you have.

 

[Henndrik]

BCM chick with her penguin suite.

 

[Henndrik]

The same BCM hen as an adult.