A herd management system for monitoring and managing the movements of animals within a herd comprises a user interface for defining one or more virtual fences for each to comprise a paddock, a plurality of wireless tags affixed to the monitored animals, and a network server for managing communications between the user interface and wireless communication with the tags. The tags include devices for stimulating the animal to move as desired by the herd management system, including staying within a paddock or moving from one paddock to another as guided by the system.