I have 3 isa browns 5 buffs and 3 barred rocks. I have learned that if you do something enough you could teach the chickens almost anything reasonable. I have taught my chickens a word I yell cluck cluck and they all come running. I taught them to actually come to me when I call them like dogs. When its getting close to night and I want them to come in it doesn't matter where they are they always come running to come to me!
I have 2 silkie hens and I call the girls. When I want them to come to me I just yell girls and they come running.