Cows don't "already eat parts of cows" except in that most tenuous sense you made out of self reabsorbtion of placenta, which is common to mammals.

Do I "eat parts of people" if I chew on my nails? In the same tenuous sense I do "eat parts of people", but really we both know - its just a stretched caveat to the rule that we dont really eat people, and cows dont really eat cows.

And what kind of "small animals" do cows hunt ? Slugs, beetles perhaps... never mind.