You said you would go from 5:1 to 3:1 by killing 90% of the bucks. So, if you have 100 does and 20 bucks and kill 18 of those bucks, the next season starts at 100:2 or 50:1. Of course you know by that article and it you read Dr. James Kroll the concern in the sex ratios is breeding and fawns aren't counted. And 3:1 ratio is a good, realistic goal for the serious hunters.