I've never herded cattle on a bike, but while working as a night watchman while in college at the former 20th Century Fox Ranch near Malibu in the early '70s (now Malibu State Park), I did herd them in a 1964 Dodge Polara at 2 am, driving over hillsides to keep the local herd away from the vegetable scenery on the Swiss Fambly Robinson set. I did occasionally have to get out and run them out of the creek beds on foot, which was no fun.
(8 miles of dirt road and rough track, MASH and Tora Tora Tora! sets. Clueless friend once drove into MASH filming and got yelled at. At the official 12 mph each patrol was to have taken 40 minutes, but I got it down to 17 minutes, hitting 70 on the wider straights and driving sideways around corners at 1 or 2 or 3 in the morning. The patrol cars, junkers from the TCF impound, would generally last ~3 months before we beat them into the ground and they had to be replaced. Good times.)