The notion of trophy hunting is may be not the same for all people. In few words, for me trophy hunting is to harvesting the biggest and the most beautiful animal that we can see, without consideration of breeding or guide roll in a herd. There is imo the first problem by the conservation of a species. The genetics diversity is a another one by isolate population. In practice, the sportsmans have to think about, if by buffalo hunting, for exemple, we shoot in the future only daggaboys. The rest is the job of the PH's to manage the herds.