We have two cushings horses(31 and about 34)  who have been on compounded capsules for a few years.  We put the capsule in a very small amount of Triple Crown Senior and put it in their feed pans.  After they eat that they get their bucket of Ontario Dehydrated Balanced Timothy cubes with about a cup of Stabul I on top of them.  They think they are getting a treat and gobble it down.  Years ago we had a mare who wouldn't eat the capsules, so we took the powder out and put in TCS.  It stuck and she gobbled it up.  I think they are all different, but it will be much easier if you can get them to eat it wihout having to syringe it in.