QDM yes age 56. QDM has as much to do with habitat improvemet as to getting the buck/ doe ratio in check. It is a total package designed to provide a good mix and supply the proper number of carrying capacity that the land will support. In my opinion you want the dominant bucks to do all the breeding. In VT we have way too many doe and the big bucks are far and few between and can't service all the does. Getting too much breeding from inferior bucks and the gene pool has fallen off.