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Nope. It worked that way before 1950 but not anymore. The cross breeds you would obtain from todays White Plymouth Rocks would have one of these two on the mother side; Standard bred (show- big, very, very slow growing without much breast meat) or Utility (hatchery- smaller birds selected more for egg laying, more plump and meaty but again slow to mature) The father side of the cross in the show version is a very meaty but extremely slow growing bird that is bred to proportions that make it difficult for them to breed. I don't know much about utility/hatchery Cornish. But they would have to be more capable of breeding and laying more eggs than the show birds.
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Raised to the larger sizes the females are not as efficient as the males. Below say 5.2 lbs live weight they are a little more efficient.