Jason, I know many, many chickens growers in and around my area. Broilers do not live in cages, they walk around on the floor of the house. The changes are mostly watering, cooling, heating and feeding systems that are mandated by the processors who also sell much of the equipment they require.
Chicken processors control the supply of chicken by either delivering or NOT delivering chicks to the contract growers. That is fact. I have seen it too many times. Funny thing is......they always seem to find another sucker down the line who will build a new chickenhouse, only to get screwed sooner or later.