Notice I said ONLY the first litter they try to breed off. It is funny how many people try this and think they are going to make a profit! Pretty much after the first litter I find many owner's don't want to go through that again. That is when they get them fixed. I don't think any of my friends who tried this EVER made a profit of any kind. Not many buyer's for $400 puppies who's breed is in question.
The vienna boys choir castrated!!!? NOT that I have ever heard of. They just kick the boys out when they hit puberty and their voices change. That is why they are called a "Boy's choir"! The boys are typically kicked out by the age of 11 or 12. It is the same with the group "Menudo" in Mexico. Their singers are also kicked out by age 15 or 16. They are too "mature" and outgrow their teenage fans.
Really you thought the vienna boy's choir was castrated?