Cool, I might try that! My pony definitely pins his ears, and he has sort of nipped a couple that didn't move fast enough in the past. And yes it was effective, LOL. I doubt the cattle here have ever been worked from a horse, though -- the way they move them if they need to is to pour a bunch of these cattle pellets they have into a bucket, shake it loudly to get their attention, then hop into the tractor and drive at a slow walk until they get where they want them to go.
Hmm, one possible issue -- the herd has a bull with them as well. The bull is docile and nice to humans and neither he nor the cows have horns, but is it possible that he might try to "protect" the cows or calves if I try to move them?
IDK. Most herd bulls, unless they're actively romancing one of their ladies 'in season', are pretty chill. They know what is expected of them. The ranch owner would know whether or not their bull is a jackwagon to horses. Most ranch owners won't keep one around if he's mean enough to mug a horse working the herd. They don't have time for that nonsense and a bull like that, or his female counterpart (See below - Crazy Cow) will be promptly hauled to the livestock auction and sold for hamburder. They simply won't fool with the mean ones... unless they're a rodeo livestock contractor, then all bets are off.
My personal experience: All of ours wanted nothing to do with horses. Carlos, our Charolais/white limousine looked intimidating, but a pleasant HOLA CARLOS! COMO ESTA!? and he was head up, pleased to see us. Always avoided the horses because he knew it meant they were about to drag him, forcibly, out of the neighbor's lease pasture. But even then, the neighbor lease owner had his own bull and even though they fought and competed for the attention of their ladies, neither was ever aggressive toward us or the horses (Unless they were RUNNING TO GET AWAY FROM BEING CAUGHT... then they'd run over you, so it was always best to keep a truck between you and Carlos, or be in the bed of the truck, or in the cab, or on a horse.... chasing Carlos.
However, you can be guaranteed there will be at least one or two 'crazy' cows in every herd. THOSE are the ones that will take on a horse and rider or pin you against the feed truck and 'wool you up'. They're at their most foul when they have a calf to protect. I've never known our bulls to protect the calves - only the cows
have done that... and woooo... that is some scary stuff when they get you wadded up against a vehicle and those few seconds seem like minutes.
Also... Uhm... Well. Okay.
Ranchers... aren't exactly polite when they're doing work. Hope you're prepared for all manner of rude and exotic vulgarities to be shouted, uttered, yelled, screamed, etc.... beer during... possibly cigars later... and um. Yeah. The real ranchers I know are pretty salty and more intimidating than their bulls. I love their company, but you better have a thick skin and not take things personal if you throw in with a real working ranch set up.