A ranch (from Spanish: rancho/Mexican Spanish) is an area of land, including various structures, given primarily to ranching, the practice of raising grazing livestock such as cattle and sheep. It is a subtype of farm.
Poultry farming is the form of animal husbandry which raises domesticated birds such as chickens, ducks, turkeys and geese to produce meat or eggs for food.
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Well, if you consider farming torture, which I assume you do from the context, then four million chickens are about to stop.
Farming is plants. Ranching is animals.
The term “ranching” is only for some types of animals.
https://en.wikipedia.org/wiki/Ranch
https://en.wikipedia.org/wiki/Poultry_farming