I stop feeding it around September. Usually start around January. The only reason I stop feeding it, is to keep them from going Nocturnal prior to hunting season. The sterile theory is somewhat true, but studies only found it to be true in pen raised deer who's diet was mostly made up by cotton seed alone.
Feeding wild deer year around probably will not have this affect, mostly due to their diet being natural forage. I'm pretty sure if you feed deer in a normal free range environment year around that they will become sterile. I believe most of this ideology comes from ranchers which find this to be more true in cattle.
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