IMHO cattle are more aggressive is it breeding is it feeding ?
On the dog thread one brand of dog food is seemingly known for the effect it has on dogs.
Your food idea could be right. I remember having a friend's cattle in our fields - Angus, Blondies, including cows with babies - we could take our dogs through any time. Admittedly the cattle did know us as the fields were right beside the house and we went over to them every day, but even so they showed no aggression at all. In fact one cow abandoned her calf, the farmer assumed it was dead, but her men couldn't find the body they were looking for, my dog Flash went on point and found the heifer calf - it had been moving every time the men came looking for it. Managed to pair her up with another cow that had lost it's own calf. She was called Lightning by our friends (see the connection? Moved fast, found by a Flash?

) and is still on the farm as far as I know. Liz decided she deserved to live.