"The previous DD goals implemented in 1980 were based on 20 years of research with deer in enclosures with the 3 different stages of timber development."

I was aware of the dd goals based on timber stage, and knew they had to have been based upon some study, but wasnt aware of how they were obtained, or from where. Didnt know if it had been a "Pa specific" study conducted in Pa or if it was a generalization based on forest type across the northeast etc. Also if it were done in Pa not that it matters much, but didnt know if it were Pgc, dcnr, or whoever else that had conducted it. Was this a study done by pgc?

Also why have exclosures to see how growth can occur with no interference from deer, if such a condition is not an acceptable option? Seem unrealistic to relate such extreme condition to real world practice.