Re: Rabbit from Hare-Today
I've heard the caution about not mixing products from multiple sources, too. I just ignore it. You'll also hear people talk about "hot" and "cold" meats and what not to do with them; that's some kind of ethnic herbal "lore" and I ignore that, too.
Organs have non-soluble vitamins (such as Vit A in liver) that you don't want to overdue, so I would recommend you always measure your organs and feed no more than the recommended 5% (of each).