cock fighting

What do you think about cock fighting? It seems to be a very interesting culture. There are many components to this animal sport, if I can call it that.  


Do Roosters naturally tend to fight each other in a uncontrolled environment?


How is conditioning or training a rooster to be better prepared to fight any different in concept to training a human boxer?

Are there any other organized groups that train humans for combat? If so list the groups.

Most food industry companies inject chickens with hormones in order for the chicken to develop a larger breast. The chicken is raised, butchered and prepared to sell to the public, Millions of chickens are killed and sold everyday. What is