I just noticed, that the barn shows an fodder quality in percent when placing it.
But this only shows, when you cannot place it. Otherwise the overlay with the building name and fodder quality is not shown.
- Select barn from build menu
- While still not placed but at “hand” only the barn is visible and the fodder quality colors on the soil
- Move the barn (still not build) over a piece of road or any other building and suddenly you get the fodder quality in %