Chaim answered Dr. Dan's question on a recent "Ask JTF" He said it was because in years past, the determination of what was actually beef by visible inspection was not always clear. I didnt quite follow this, but it does make sense with respect to pork. I have seen lean cuts of pork that would have fooled me as having been chicken. I think perhaps in days past when the processing of food was less to non-existent, it couldn't always be ascertained beyond a reasonable doubt if something was for sure NOT beef, if it was meat. But seriously Chaim answered this question recently from a user callled.....I forget... hold on..David Ben Zion