Yes, It is call caponizing. It involves removal of the testes which are internal and is therefore not something a novice breeder would wish to undertake.
Sometimes, but rarely. Roosters, like most animals, engage in Alpha Male activities, whereby any male who challenges the dominance of another male in a roost must be dealt with. On the other...
It must declare dominancy in order to be the Rooster of choice when it comes time to breed. The roosters will continue to fight until there is only one left. It'll peck apart another rooster to make...