Agree that feed efficiency is key... But how to interpret that from the proofs? Look at production vs. maintenance as a rough guide?
On grazing Holsteins, it's a smaller stature Holstein with good legs and feet that can make milk off grass.
Here's one interpretation:
That's not grazing...... No wonder the spring calvers run away from holstein, if they need that much management, pretty happy to stick to Monkey cow which do all the hard work