One of the issues with birds and fowl in your deer pens is TB. When the vet does the test, the bovine innoculant will show a reaction if the deer have been exposed to avian TB. The deer cannot get avian TB, but the TB test will need to be re-done. Many times on the second test, the vet will again use bovine innoculant (this is standard protocol) and it too comes back as a reactor, moving your deer into the "suspect" catagory. The tell-tale test (usually the third test) is a comparative test using both the avian and the bovine innoculant. This usually clears the deer, but it is the third test in less than 60 days. I doubt if any of us want to risk our animals for excessive TB testing.