The meaning of this symbol could be very much like that of chickens.
However, the cock represents male energy and possibly aggression.
If you ever observed a cock in a hen house you would notice that they are very aggressive, demanding, and territorial.
This dream may be pointing to these characteristics inside of you or others.
A cock crowing is a traditional wake-up call on a farm while in literature it is sometimes symbolic of some type of a warning.
If the cock in your dream is crowing, think about your current situation and if this dream is a wake-up call in regard to a situation in your life