I had a bullock charge at me once. i stood my ground but only coz i had nowhere to go... i was backed up to a fence. thankfully it did stop (but not before i left a big skid mark in my pants) and i slowly edged my way along the fence until i was able to leg it. i reckon it wouldn't have stopped if it had been fully grown.
B*gger that

funnily enough it the Bull calves do seem very bolshy and do stand their ground but I'm quietly confident of winning a fight against one, as long as it's mates don't get involved
Just asked a farmer who actually has a bull whether he would enter a field on his bike where there was a bull and he said probably not.
Thanks Shaun, thats quite worrying really but then I guess he doesn't really want anyone in his fields anyway.
Thanks all
I've been back through there twice now, and they've all been back well away from the road so no problems there.
I've actually been a bit stupid with these, they are Beef cattle not dairy so it's probably far lower risk anyway.
last time I went through I saw a jogger and another cyclist so they're probably more used to to than I thought.
I'll be really anonyed if I get stomped into the ground next time having said that now.............................