After the rut, the hormone testosterone begins to decrease and when it drops to a certain level, antlers will shed. Since antlers shed at different times in certain areas and in certain years, something causes the testosterone levels to vary from area to area and winter to winter. Thus, the real question is what causes the testosterone levels to drop to the required level?
We know that testosterone and mating are related, so high numbers of does could lead to late shedding of antlers. Here is how that works. Testosterone in bucks stays high when they chase estrus does. Does will only come into estrus if they have not mated, so when you have large numbers of does, all do not get bred in November. When that occurs, we’ll have hot does popping up in mid December, and rutting bucks will be chasing. The more does not bred, the later antlers drop and once most does are mated, the buck’s testosterone levels drop and so does his antlers.