I have two roosters. Rescues are full and I refuse to take a chance of them becoming dinner. I chose to use the collars. They can still crow but it's not as loud. They tend to just crow when they hear the other roosters in the area,but it got loud fast. As long as you watch them, make sure they are eating, breathing normal, etc, the collars work. I know they are not super tight because they can still crow pretty well.