If you caponize before they start crowing at all, it can often result in them never having the urges to crow.The only thing that stops one from crowing is altering its voice box . We have a member here who's name is Dr. James Richards, a vet in eastern OK.His member name "bluedogsonly" .He also has a video on tube called "Decrowed rooster".Please look him up here and visit youtube to watch the video