The message displayed for a gelding gelded as a foal is a bit confusing with the second paragraph (one with an explanation how does fertility work in general) still displayed on the screen in an unchanged form. It's clear in the first paragraph that due to very specific circumstances fertility of this horse will remain mystery, however, the second part starts with "The veterinary can test your adult horse's fertility. [...]" followed by default explanation of fertility itself and how to test it.

I'd expect to either have first paragraph displayed in simple manner like "Fertility: Unknown"/"Fertility: -" with second one also displayed for clarification and general info about the stat or hide the second one/ merge both (so important info is still displayed there) instead of the game telling me that I can't test it here, on the second thought I can BUT actually can't because that's the untestable case - which is an info I already got from the first sentence on this subpage.