Emmm...cause thye are big and lay lots of eggs ( i really dont know)
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OHO.K
Here the explanation.
Turkens are a breed that is covered only white 40-50 percent of the standard breeds feathers. And because feather are 80% protein thy invest a smaller percentage of there feed protein to manufacture feathers, that leaves them a bigger portion of the feed to produce eggs and meet than a standard full feathers covered breed!