Have you got yogurt?

I tried feeding my hens yogurt - and they loved it! They made a huge mess, though. Globs of yogurt would get stuck to their beaks and they would fling them on to other hens. Then run after their glob, of course. Abby eventually had to try the yogurt too... and finish it. Everyone now has white smudges on their feathers, and won't let me clean them off. So yucky white crusties it is.