You know, I've had a hard time eating beef for the longest time now. A light-bulb went off when I found out I was allergic to cow's milk. His theory is that if I can't handle the milk, then, along with my FMF, there's probably something going on with my stomach trying to digest the meat proteins, so I still rarely eat it.
Maybe it's just harder to digest the proteins in red meat than it is in white meats? I'm not a fan of raw pork, but I know a lot of people feed it,
have you tried that or any other white meats?
This article is on humans, but it says that red meat is harder to digest: But red meat also takes longer to digest, making the protein less bio-available then other sources, too. “Red meat is simply not the most efficient way of getting amino acids into your muscles so that they can repair and grow,”
But it also claims that pork is still red meat:The only difference is that pork contains less "myoglobin, an oxygen-storage protein found in muscle,”
SO maybe you should look into "myoglobin" a bit further?
It probably would have helped for me to put the link to the article I was quoting: http://www.menshealth.co.uk/food-nutrition/the-truth-about-red-meat