Anytime you put something (like licks or feeders) out on your property that increases the chance that deer are going to come into contact with one anoter, then obviously disease can spread faster.

Interestingly, high levels of manganese and extremely low levels of copper in deer brain tissue have been found when CWD outbreaks are about to occur. Researchers are exploring any connection between CWD and mineral licks but I'm pretty sure they aren't to the cause...probably a vector but not the cause.