Why the pattern of cyclical movement between summer and winter pasture is essential for pastoral communities of the Himalayas?

The pattern of cyclical movement between summer and winter pasture is essential for the pastoral communities of the Himalayas to adjust to seasonal changes and make effective use of available pastures in different places. When the pasture get exhausted or become unusable in one place they move their herds and flocks to new areas. This continuous movement also allows the pasture to recover. It prevents their overuse too.