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Try adding some hiding places and see if that makes a difference. If they haven't crowed that early before, it could be that daylight is coming earlier, or it could be that a predator has been hanging around.

I don't know if there's much you can do with your setup. The general rule is, happy roos don't crow, or don't crow much. What kind of enrichment do you have in the cages? Do they have dirt baths? Places to hide? These things may help.