While I'm unsure about chickens, they're also [ab]used for larger meat animals like cows and turkeys because they make the animals grow larger, faster. The fun

While I'm unsure about chickens, they're also [ab]used for larger meat animals like cows and turkeys because they make the animals grow larger, faster. The fun thing is - nobody knows exactly why this happens. There's a bunch of hypotheses, but they're exceptionally hand-wavy.