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That would depend on what mechanism is making the rooster "crowless." If he crows for a short time (or no time), or crows quietly (or silently), I agree. But low testosterone might remove his desire to crow-- along with his desire to mate. That would produce a "crowless" rooster that does not...

That is an interesting question. Maybe someone already knows the answer. Did you breed from any of those mute serama roosters? Did they have any problems with breeding or fertility?