Most folks who go to Africa for a hunt these days are more than happy to do cull hunts rather than trophy hunts. It's only the very elite-types who will insist on a trophy hunt, and I imagine there are very few remaining PH's who will accommodate those types. Pretty much all hunting in Africa is now on private game preserves, meaning the preserves own their animals and they are managing the quality of their herds the same as we do for deer and elk here. The PH's and preserve managers want to weed out the older bulls and cows who may not actively reproduce anymore but are still dominant over their herd keeping the younger bulls from breeding the cows, and/or they want to weed out those that are genetically inferior so that they aren't breeding and continuing those lesser genetic traits.