Change is the inherent challenge to which forage-livestock systems are constantly subjected.To succeed, these systems must have flexibility to accommodate to changes including drought, too much rain, shifting market opportunities, cycles in needs for pasture renovation, requirements for stored feeds and numerous other factors that influence these systems. Successful systems are flexible.
They can bend and stretch to accommodate changing demands. Inflexible systems and inflexible managers don’t last long. 
From Forage-Livestock Quotes and Concepts, D.M. Ball, et. al
