I have planted Whitetail Institute Pure Attraction on July 27. Deer have really be enjoying it but the other day I noticed that the oats are really thick and some are starting a little yellow in color. My question is... Is there a "shelf life" to this stuff? Meaning is this now considered mature and deer will leave it alone until snow fall? Can't tell by the photos if they are eating it or not as I have mixed other seeds in there as well. I did notice that some of the stuff appears to be "nipped" off but not much. I haven't really done oats before. Here is a pic taken last week. Any advice or experience would be much appreciated.