This is called tethering. You can find more information here:
"Gamefowl will normally be housed in separate pens or tethered with cords attached to tepees or barrels. Tethering is the most convenient method of keeping the males separated and at the same time providing the most natural environment for health, body and feather to develop. Tethering is more economical as this does not require near as much material for shelter. Tethering requires less space, allows for easier moving to fresh ground, and decreases the risk of having the feathers damaged by wire for show purposes."
http://www.ugba.net/
"Gamefowl will normally be housed in separate pens or tethered with cords attached to tepees or barrels. Tethering is the most convenient method of keeping the males separated and at the same time providing the most natural environment for health, body and feather to develop. Tethering is more economical as this does not require near as much material for shelter. Tethering requires less space, allows for easier moving to fresh ground, and decreases the risk of having the feathers damaged by wire for show purposes."
http://www.ugba.net/