Properly storing hay is a logistical challenge for farmers. Hay that is baled and stored too moist — at moisture levels above 15–20% — can lead to the growth of molds that reduce bale weight and nutritive value, and impact animal health. Improper hay storage can even cause so much microbial activity that the bales read more UMaine study shows alfalfa and other legumes may be less responsive to preservatives than grass hay