I'm assuming you're saying cows don't naturally eat corn, and not saying that cows don't naturally eat grass.
Fish are carnivorous. Fowl can be carnivorous, and are certainly insectivores. Pigs, I believe, can be carnivorous on occasion, and insectivorous.
This whole "disagreement" started, or I stepped in at the point where you tried to correct omelet on a web search, and your own link didn't support your comments, though I think your comments didn't exactly say what you are continuing to expand on. After that you added the comments about fortified foods.
So, you weren't clear in what you wrote, but evidently were defending positions our information that was in your head, but not coming out of your keyboard.
I don't have a problem with vegan or vegetarian, unless someone starts proselytizing, which I've had happen to me, as I'm sure others have. I didn't say you were.