You can’t compare individual body weights to previous years, but you can look at trends with many data points. If the trend is that the average of all bucks in the same age class has decreased then one of two things is happening. One, the habitat quality and quantity of available natural browse has decreased OR the population has exceeded what the habitat can healthily support.

I have seen the exact opposite on nearly every property I hunt or assist with management. Not due to corn, but habitat quality and the wet spring and summer we had. It led to excellent herbaceous growth and deer were in great condition heading into fall. High acorn production in most places kept them healthy and this led to some of the highest body weight averages , and individual body weights I’ve seen recorded in a long time.