Be careful, be very careful. Treat them as equal - their inner lives are rarely fed by farmers. They get bored (and treat as animals). Sucking noises calm any mammal, and many birds. They love being scratched, preferably with a wire brush! They'll eat plastic-like cagoules, or try to. If they like you they'll lick and slobber and not let you go. Breathe into their nostrils if you want them to remember you. They appreciate water carried to them in a bucket, extra strong mints and having the plates of dried kak picked out of their hide. The fiercest looking ones are sometimes the most docile. Don't approach a bull wearing red or without identifying a secure escape route. That's enough to start with probably!