I have 3 Plymouth (barred) rock hens. I think there hens, two of them are much bigger in size and have combs that are starting to look like roosters. They are all almost 6 month old and the smaller one has a very small comb. Let me know what your thoughts are. Thanks for the help.
The bird in that picture does not look 6 months old, more like 3-4, and at that age it looks like a barred rock mix cockerel. If you're 100% on the age, if that bird is indeed 6 months in that photo, it's a barred rock hen.