Tangential note about the second link: in my experience (having done my share of work on a cattle ranch when I was growing up), cows are very easy to move. Just look big. Put your arms out. Yell "heeeaugh!" at them. They'll spook and start moving away.

This might differ based on the herd, though. My uncle's cattle are beef cattle, so not much in terms of friendly human interaction. Dairy cattle might have less fear of humans.