Stags, & Cocks(Roosters) only. Hens/pullets don't need to be dubbed.
Dubbing can be done anywhere between 10 weeks to a year of age, as long as the comb, & wattles are grown out enough. But it must be done before a bird is shown.
I would love to show, and even though I would most likely not have the space or time for breeding chickens, I want to ask a question. Is it required to crop and dub gamefowl in 4-H as it is with other chicken shows? If I ever showed, I would want to show gamefowl because I love them and they are unique, but I am never abusing animals in any way, so if I was required to crop and dub gamefowl that would be an immediate no. I am just curious as to what the rules on gamefowl are at 4-H.
Maybe just show females, since dubbing is not required for them, and keep the males at home undubbed. That would be a way to have your favorite kind of chickens, show some of them, and avoid dubbing any.