I would think it would be illegal. Wyominggrandma posted "they can geld it anyway they want". What, then, would stop someone who is abusing an animal from saying "I can reprimand any way I want"?
To me, this is sick. No pain killers? Seriously? You would think the men working would at least have that much sympathy.
Anyway, I would definitely call the authorities. The worst that can happen is they say there is nothing they can do... And at least you would know that you did something.
The sensitivity of the internet baffles me.