Or maybe it is enought just to do one simple thing - when one opens the information about the litter (any of them - with HD or without it, bonitated or not), he sees big bold letters on the upper part of the page (before the photos of parents), something like: "Attention. HD results are important, because....., pay your attention to the bonitation code, it is important because..." The formulation should be short and clear
Usually people simply do not know how important HD is, also nobody knows about bonitation if had nothing in common with CsW before.