I have a 4 yr old who has just been broke this past summer. He is a very aggressive horse and has always been kinda pushy. Needless to say he is not one of my favorites. My trainer was the first to notice the kicking. When we brought Blue home we put him in several different pens, (not because of the kicking, at that time we didn't see the problem) mainly due to space. So he ended up with our yearling in just the past month or so. He has shown himself as the boss over the yearling and that's ok. But now that winter is here and we are feeding and blanketing more, Blue has become more aggressive about feeding. I have to separate the two when I feed and it is typically dark at both feedings. Blue will chase off the yearling and try to get into his feeding area. I have to haze him away from the feeding area, and Blue will kick at the yearling if he trys to come close to the feeding area. So I have to play linebacker with Blue so the yearling can get into his feeding area. On a few occassions Blue has tried to kick not only at the yearling but me too. To me it seems deliberate, because I'm trying to keep him away from the food. Separating them would have to be my last resort. I really don't have any other younger horses to keep the yearling with.
What can I do to break Blue from kicking?