I have read an intereseting arcticle from a biologist that suggested it was the way the corn was piled up that was the reason that transmittal was happening. I dont ever pile my corn up anyway, I always spread it out to mimic natural browsing. This spreading of the corn on the ground and minimizing the use of high capacity feeders was suggested to lessen the spread of CWD by the biologist. These ideas are sound suggestions to me.