"Feeder" can have several meanings, possibly including a person who feeds animals (although I don't think I've heard it used that way before). It probably does not mean a person who owns a feedlot. Can you provide context? "Feeder" can also refer to a part of a machine that supplies something to another part of a machine. Example: "The water feeder pipe in the coffee maker is jammed, so it won't make coffee." "Feeder" can also mean other things that supply something to something else. Example: West Middle School and South Middle School are both feeder schools for Central High School.