In humans, we don’t usually castrate them because it throws their hormones out of whack, and causes all kinds of issues, but wouldn’t that also be the case for some animals, since their hormones systems are fairly similar?
Why is it that that we remove the testicles entirely, rather than giving them vasectomies like we do for humans?
WOW! That IS a fun fact!
For another helping: this is also why they were used in at least one culture I know of as servants to the Queen or the King’s consorts. Didn’t have to check paternity if you castrate every other man they ever see.