@romea
I use the My Pet Chicken No Crow Collar you can get on
Amazon here No-Crow Rooster Collar (L)
https://a.co/d/gaJpPVl
It is well made, sturdy, and soft. Mine have been reused, even, as one bird grows out of a medium into a large or grandpa passed and his son took over
Unless you have a bantam or Jersey Giant you'll likely use a large unless it's a young roo. It's better to over wrap a little than have short ends that don't overlap well. Put the end to the back of neck, so the roo can't pick at the ends and loosen over time.
It's best to put the roo in isolation and put collar on loose the first night or two. The roo will try to back out of it, pick it off, roll it off and can get himself into trouble if he fights too hard. Most accept pretty quickly...similar to a puppy or kitten with first collar. Tighten a little by 3rd and 4th. Get to little finger loose (flat of tip of finger inserted between neck and collar) by day 5 and 6. That usually will dampen crow half way but allow eating, drinking, breathing, mating, running, and mild to medium crowing. If you cut crow entirely or to a completely choked off sound, it's too tight for health.
Check regularly. Make sure crop is voiding well. Avoid over fidgeting with it once you've got sweet spot
I've used the collars for the last 12 years. My first roo lived to almost 6 years with it. Others typically 3 to 4. Some have lived shorter dropping at 2, but then generally most died from other causes being hauled off by a coyote or coon, which the collar is useless in preventing, lol. All fat and sassy.
I suspect the collar puts a little more strain on their heart if they are strong crowers, which may be why a couple dropped at 2 years of age, but the alternative in my neck of the woods is the soup pot. Nobody wants roosters.
I've had excellent fertility with my roos so it ain't slowing them down any.
I know the collars are controversial, but I think if they are used carefully, they are a good alternative to a rescue cage or soup pot. Mine have lived the high life in theirs surrounded by lovely ladies...and happier neighbors.
LofMc