Dominique or Not?

[ChickenAddict92]

I've always assumed that the Dominique hen I have, Duck, is a Dominique because her coloring is the same as her buddies. I'm wondering about this though because her comb is different than the other dominiques. Duck has a single comb and the others have rose combs.

This is a picture of two of the Dominiques. The blurryish one in front is Duck. In the back is one of the other Dominiques for comparison.
Here's a better picture of Duck:
Any ideas?

 

[AccentOnHakes]

That means she's a Barred Rock.

 

[Pinky]

That means she's a Barred Rock.

I agree,looks like a Barred Rock.

 

[Lothiriel]

Duck is a Barred Rock.

 

[hdowden]

yes duck is a barred rook

 

[ChickenAddict92]

This may sound kind of stupid but I also posted a similar question (before this thread) on the Dominique thread. One of the users on there said that maybe a Dominique had been accidentally bred with a Barred Rock which is why she has a single comb.

Thanks for all the replies. It's clear that Duck has some Barred Rock blood in her.

 

[Fred's Hens]

The breeds have interbred so much, this wouldn't be uncommon to see.