Yeah so if you use a Human Liver your king is not able to breed any Lionesses because the lion is under Amok.

The user themself probably knows this (I just haven't thought about it and did not turn off my public studding services). However, other users might not know this (maybe they think it's just a decor) and send breeding requests to the king on their last heat day. That just happened to me half an hour ago.
My king also does have a Translucent Jellyfish applied, what makes his art - and with such the impression from the Human liver - dissapear. It can only be seen when you temporarily hide his decor.

I had to reject and wasn't able to explain my situation, because the user also blocked pm's from other users. That's their own problem you might think now, but I believe it would be a nice addition to include a small message ontop of the Stud that says something like: This lion consumed a Human Liver today and is not able to breed until next rollover.

Just like the message when you use a Roasted Lamb or a Red Bull.
I know this might be a very specific problem that doesn't occur very often, but adding that message would minimize future mistakes from other users and is probably not that hard to add.