The Role of Cattle Grazing Management onPerennial Grass and Woody Vegetation Cover in Semiarid Rangelands: Insights From TwoCase Studies in the Botswana Kalahari

Abstract

• We assessed the long-term effects of continuous and rotational grazing on grass and treedynamics on adjacent ranches in the semiarid Kalahari of western Botswana.
• Rotationally grazed ranches had higher grass cover with more perennial grass species, higher grazing value (and capacity), and higher long-term stocking rates than their continuously grazed neighbors. Tree cover tended to be higher on continuously grazed ranches, suggesting that long-term continuous grazing reduced grass production and favored establishment of woody vegetation.
• Improvement in semiarid rangeland health and production is unlikely to be achieved simply by reducing stocking rates; uniform grazing and growing season recovery periods are essential.
• These and other case studies suggest that benefits of grazing strategies likely depend on scale and adaptive management. Future research should be at larger spatial and temporal scales.

Keywords: continuous grazing, grazing capacity, grazing value, rotational grazing, stocking rate.