My guess is that deer hear more prevalent in the lower frequency ranges. Some large animals like elephants communicate over serveral miles distance by using extremely low frequency sounds (lower than humans can hear). Most of the sounds the deer make are not the loud squeeling pig type sounds but lower freq type sounds like grunts and bleats, although some younguns tend to make higher pitched sounds.

I think your research should be directed into what types of sounds or at what most common frequencies are deer frightened/alerted. Then what types of movement do we as hunters do that creates sound in those frequency ranges and how can we minimize them.

If only I could build a bow that sounded like a doe bleat when it went off.

Cargo