Really? I think that barley and BOSS are the easiest to sprout. They take a couple days to really get going but oats... those are what I think is difficult. Some sprout right away but most do not. Probably somewhere around 10% will sprout quickly and start growing but the rest of it takes a lot longer to actually do anything. Drives me crazy!
I feed BOSS to my horse. It sprouts all over the pasture.