The handler walkway is 42 in. (1066mm) down from the top of the fence. This standard height is used in ranch facilities, feed yards, and slaughter plants, throughout the world. The person in this picture is 6 ft. (1828mm) tall. A 5 ft. 6 in. (1676mm) Mexican or Chinese is easily able to reach over the fence to touch cattle.
Humane Cattle Pens, Custom Designs and Behavior Consulting