"Keeping chickens in their place prevents the uprising."
Though many ranchers simply let their chickens roam the ranch, a coop is the tool of a serious poultry producer. Coops keep Hen-hens and Roostros close, allowing for maximum egg-laying potential. Just remember to avoid crowding the coop: Chickens won't reproduce when in close proximity to more than a dozen other hens or roostros. But give them room and watch the love bloom.
A coop is an obtainable plot in Slime Rancher. Coops are typically used for owning and breeding Hen Hens and Roostros.
Great for keeping chickens in and hungry slimes out. Price: 350
Spring grass attracts scuttle bugs that chickens just love to eat. With their bellies full, hens will produce eggs twice as fast. Price: 425
The very latest in advanced poultry tech, the vitamizer bathes the chickens in 'vita-rays,' allowing them to grow into healthy hens and roostros twice as fast. Price: 500
The reference to "uprising" is likely a pun on the word "coup" which means uprising or revolt.
A coop is not necessary to breed chickens; they can breed in the wild and free-range on The Ranch as long as a Roostro and any Hen Hen are in range. However, a fully upgraded coop speeds up the process.