IMO the key is to have more than one good buck in the herd.
Everyone passes up that mature buck thinking he is gonna knock up every doe in the pasture, and that's just not the case
If he bred 3 does a year from 3-6 years old he has anywhere from 9-12 fawns if 100% fawn crop.
So in real life how many fawns did he really have in his life? 3-4,5-6 tops?