bah, with young cows and bullocks especially they are INCREDIBLY inquisitive. anything that moves or smells good will attract them, followed by the rest of the heard, usually in a semi-stampide sort of pace.
normally when i’m out in fields I have a pair of collies, if they were on the lead I would let them off at this point to get them away from me as cows are attracted to the farm like dogs. Then basically do as you would with any other large animal, make yourself look big and walk toward them, generally they will turn & flight, occasionally come back at you whilst crossing teh field, just do the same. With bulls, don’t state them in the eye, and if you do, make yourself big & bold, walk where you want, never turn your back etc etc.
bikes, bullocks love bikes, its like christmas for them, all those colours, smells & noises, and moves at aspeed thats good to chase. do as you want, mostly I just keep riding where possible. they’ll be a whole heard behind me, just make sure you don’t get yourself trampelled at the gate, stop, turn on them, then proceed on foot slowly to the gate. otherwise they will be on your ass like 20tonnes of hot braindead beef ……oh!!… wait 😉