We have a bunch of roosters --- 12 weeks old. when we got them @ 1 to 4 days old I started gently stroking their throats in the hopes of damaging their crowing mechanism. I did this only a few times when they were little. Now at 12 weeks old -- 1 has just started to crow. MAYBE-- perhaps no one else will crow??? Anyway is anyone else willing to try this and see if it works??