ok wait... so something in the bowels of the buffalo, I am going to speculate that it is some sort of bacteria/yeast was eating the digested/broken down grass... and turning it into b12. Which is then absorbed by the bowels of the beast. That makes sense to me... probably happened in the small intestine.
Why cant this happen in the small intestine of a person? What conditions are not being met... is it to acidic in the small intestine, or not acidic enough? Perhaps to make b12 we need to eat grass?
I am speculating again... but when I see one group of people not needing to suppliment b12, and another needing to... I dont see a meat deficiency problem. I see a body problem.