Tom Indrebo, owner of Bluff Country Outfitters in WI, has written quite a bit in recent years on this "early rut" as he calls it. He's been watching activity for years to try and prove that there are a number of does that do come into estrous right around this time, or usually 1 full moon before the typical "rutting moon." Just like human females, some women's cycles are messed up and don't follow the regular pattern.