Must be by weight cause my COB seems to have a lot of barley. I understand the molasses is sprayed on under high pressure as the grains are turned in a tumbler. I have a 50# sack of molasses and if I use a flower sifter I could probably get in evenly on the grains but it would take a while. By the way in my COB the corn is cracked and the oats rolled, barley looks whole.