What if a bull was amongst them...

;) Bulls are not found with cows, its all AI (artificial insemination) nowadays.
But when walking thorough cows and calves take great care from the great big french cows who get furious protecting their young. Bullocks are the other cattle you will meet, be brave and you can walk right through them, but keep near to a hedge (for jumping into). A swiss once told me that if you keep to the front of a cow she can't see you to charge....