Lots of plants are way ahead of schedule this year in both areas of low and high moisture levels durring the growing season. I have ideas, but can not say why with volition. Realative to the rut, that has everything to do with the angle of the sun, rather, the amount as well as angle of light entering a Buck's pupil. This change in hours of light as well as the angle of light entering the eye preceeds the resultant stimulation of the pituitary gland and ultimately testosterone production.
I doubt the pre-rut is going strong anywhere in the midwest currently. I would suggest the deer has lost his velvet, was making scrapes on field edges and "going through the motions" as the hormonal levels in his body were starting to change.
Anyway, Just my thoughts, perhaps others opinions will differ from mine?
Bob.