All roosters crow to different degrees. I had a barred rock roo that barely made a sound but when he did you could hear him a mile away. Then there was a RIR roo that you couldn't shut up. He crowed if the wind blew.
Roos crow for many reasons...when the sun comes up, when they sense trouble or competion, or when they are just plain bored.
Here's a couple of suggestions to keep Mr Roo in check:
- a dark hen house which is closed at night. He'll still crow when the light comes up but it might be closer to 7 AM than 5 AM.
- lots of companions. He'll be worn out from courting if there are lots of hens to make much of a fuss.
- no competition. One roo is plenty for a small flock.
- keep to the feeding schedule. If you feed at 5 AM, always feed at 5 AM. By 5:10, the roo will be raising the roof thinking you forgot.
Lastly, select a roo for the qualities you want. Chance are, if you buy a straight run, that you'll have a few to choose from. The loud, aggressive roos will be obvious. Best of luck