The one question I would pose is what rotation are the houses decaked? Some poultry farmers never fully decake now, some partially decake, and some fully decake regularly. I would estimate those farmers that only do it semi-regularly or never fully decake COULD be introducing things in the environment they aren't aware of.
The litter studies that I have read are a few years old and did say that broiler litter posed no risk. I am curious if today's change in decaking procedures could have changed the levels of biological contaminants being introduced to the environment, especially if they aren't running the litter through dry stacks properly so it reaches the optimum temperature to kill environmental contaminants.
