Since you are obviously getting upset about this, and I have no idea why, I am hoping this thread gets closed soon as you don't really want to hear others opinions on the idea of making a rooster deaf for your own benefit.
Well it is not improving the bird for it to have what most vets would call a defect.
What other experiments would you have done to them? And why would you think crowing is a bad thing, when you got your birds I am sure you knew the roosters crow, no stopping it
Its not like crowing is a...
I don't think anyone here would consider themselves close minded for NOT wanting their roosters to have their hearing damaged for the gain of not having it crow.
Medical experiements like this should not happen, just another senseless way to harm animals and have the gov't pay for...they could...