I had a 'bit of a do' with about 8 of the buggers as I was leaving Cerrig Caerau & Lled Croen yr Ych a couple of years ago.
Not sure whether they were just being friendly or not. Didn't wait to find out - they were gathering pace at the time....
I've read that it depends on their age & whether there are cows in the field with them. Ask to see their birth certificates before entering the field & take a cow everywhere with you. That'll work.
I like cows.
love
Moth