Gillen et al. measured relative composition and standing crop in plots grazed continuously or in a rotational grazing system, at varying stocking rates in north-central Oklahoma. Vegetation response to grazing system was minimal, and differences between systems were diminished after 5 years. Shortgrass was effected by grazing system (increasing in continuos except under severe stocking rates), but was a minor component in species composition, and its standing crop also became similar between systems over time. Standing crop of little bluestem (Schizachyrium scoparium) remained higher in rotational pastures even after 5 years, while big bluestem (Andropogon gerardii) and Indiangrass (Sorghastrum nutans) whose total standing crop was higher in rotational the first year, were similar in both systems after 5 years. Favorable growing conditions and the high seral state of the vegetation in the experimental pastures may have tempered the response to grazing treatment.
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