I don't claim to be an expert on CWD and I'm hesitant to argue with a Texan about high fencing, but my understanding is that concentrated feeding is what often results in the spread of CWD through saliva and mucus. Since deer farming and high fencing concentrate feeding to the same areas over and over again and, particular, the use of bait piles cause hyper-concentrated feeding, the spread of the disease can be directly correlated to these aspects. Where CWD had popped up in isolated states could be attributed to traveling hunters, hence the restrictions on transporting carcasses, but you could also look at the captive populations. Sometimes these farms and high fence ranches go out of business and cut their "livestock" loose. Hog farmers have done this on occasion in areas I have hunted when pork prices plummet, but I observed this first hand when a bank foreclosed up on a high fence farm near a hunting lease and we all of a sudden began seeing red deer and Sitka deer. Deer farmers operate in somewhat of a grey area of regulations since the stage game agencies have little to any control over it and these operations are small enough and isolated enough not to attract much attention from the USDA. I'd be remiss if I failed to point out that deer farms are pyramid schemes. They don't often generate profits from slaughter, rather selling "breeder" buck seamen to other startups. In that sense, they are reliant on the continual opening of new deer farms in order to be profitable.
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