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And as a quick point out, the feed conversion ratio [1] on poultry is pretty stellar. Anywhere from 1.5-3.5:1 is normal for feed:body weight increase. [1] http

• sprocket 10y ago
  Cornish Cross in particular are fantastic at converting feed into weight gain. In 10 weeks, you can go from a fluffy little ping pong ball sized chick to an almost 10lb live-weight bird. It's often unwise to raise them past that age, because the rate of weight gain puts so much stress on their internals that they'll frequently keel over from a heart condition. By the 8 to 9 week stage, they're already so heavy that they can only take a handful of steps because having to plop down and have a rest for a bit.