My one BR hen shows no interest in going broody. However, I have 3 Wyandotte hens that have each gone broody twice this year that I put BR eggs under. I'm hoping the broody-raised BRs "learn" that trait from their foster mamas.
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The breeder I got mine from said about 25% would go broody. I free range my flock and I have a theory that that type of lifestyle promotes broodieness. In a couple of years I will call back to the breeder and compare notes to test the theory.