I've been around livestock in one form or another all my life and for the past few years helping out up on my mates farm but i still do not trust cows 100%, they are unpredictable and volatile 400kg+ lumps of meat, especially if calves are involved. This is Pierre below, he is extremely friendly and will come running from hundreds of yards away across the fields if i whistle on him as i fed him wi additional colostrum milk (from the safety of a gate) substitute when he was still relatively young and is sort of tame which is just as well as he's growing into a helluva sized bull, but i would never climb into the field with him not the rest of the cows (limousin/highlanders) if i was alone as the chance of a serious injury is too great.
I am always wary when crossing fields with livestock in as i know just how dangerous a herd of stampeding cows can be, placing your bike between them and yourself would make sod-all difference to the outcome.
This is old "one horn" below, she would as soon gore you as let you pat her across the fence.
This is "Daisy", she is placid and very friendly but i still wouldn't trust her 100%.
Never place yourself in a position where you cannot safely escape, especially with livestock you have no experience of, despite having experience i have had some arse-clenching moments to escape from.