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excellent information!Brahma do get "real big", but they do it "real slow" - like next year real slow...
And no, because hens squat to take all the weight off their legs and spread it across the ground, having a large roo on top of a small hen isn't normally a cause of injuries. I had a CornishX (13#+) on a Golden Comet (4.5#) for months. Nothing came of it, sadly.
Over mating is more likely a cause for injuries than weight disparity between most breeds.