Well, for one thing the health of the humans is the reason we raise birds lol. An egg white doesn't act the same in recipes as a whole egg, and doesn't have the same nutritional value.
For another, it appears that the Japanese egg producers are having no trouble with changing from corn to rice. They also appear to be changing pigs from corn to rice.
It's funny how people think about carotenes, we have been told so many times they are good for us.
When you get genetic testing done, it turns out that some people don't convert carotenes very well at all to vitamin A.
I can see a long line of people in my family tree, both above and below me, who seem to have the same body issues that I do, symptoms that are on the vit A overload list (such as vertigo)
Yes haha bear liver!

I did take cod liver oil though.... I'm off of supplements for life, I really am.
If I could go back and change something, it would be to stay within the RDA for vitamin A in general.