The Need for a New Approach to Grazing Management - Is Cell Grazing the Answer?
Earl, Judith M, and Christine E. Jones. 1996. "The Need for a New Approach to Grazing Management - Is Cell Grazing the Answer?"  The Rangeland Journal 18 (2):327-350.

Key Takeaways

  • This paper investigates the comparative vegetative impacts of cell grazing (an early iteration of what eventually evolved into Holistic Planned Grazing) and continuous grazing on three properties in Australia during the 1990s and finds cell grazing superior in all measured parameters, including plant basal diameters, most desirable species, contribution to dry weight, and percentage ground cover.
  • Plant selectivity decreased with cell grazing, demonstrating how herd effect can increase utilization of different plant species as taught in Holistic Planned Grazing.
  • It is reasoned that these vegetative impacts may have long-term benefits with respect to ecosystem function, including erosion control, nutrient cycling, hydrological function, and the stability of animal production.

Summary

With any grazing method, the grazing pressure applied to an individual plant is a site, stock density and time dependent variable and the diet selection hierarchy of grazing animals is to the disadvantage of the most palatable and actively growing pasture components. The greater the differences in palatability and abundance among the components of a sward, and the lower the stock density, the greater the variation in the grazing pressure exerted. These effects are heightened when animals are set-stocked under adverse environmental conditions. This paper reports the comparative effects of cell grazing and continuous grazing on pasture composition on three properties on the Northern Tablelands of New South Wales. The basal diameters, relative frequency and contribution to dry weight of the most desirable palatable species at each site were found to remain constant or to increase under cell grazing, while declining significantly under continuous stocking. The converse was true for the least palatable components of the pasture, which declined significantly under cell grazing but changed little under continuous grazing. Percentage ground cover was significantly higher after two years of cell grazing than under continuous grazing. These changes in pasture composition may have long-term benefits with respect to erosion control, nutrient cycling, hydrological function and the stability of animal production at the cell grazed sites.

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