Paraglider pilot here, so I landed among the cow my fair share of times.

Cows are curious but shy, if you walk slowly they might come to have a look, if they get too close, something like clapping your hands is enough to have them running away. However, if the farmer didn’t took the veals the yet, they can be pretty agressive to protect their kids, in that case forgot what I said about “clapping your hand” and stay away from the herd. Note also that bull are less shy than cow.