Unravelling the Influence of Adaptive Grazing Management with Multiple Paddocks on Cattle Production in Semirarid Rangeland ☆

Adaptive, multi-paddock (AMP) grazing often involves a form of rotational grazing at high stocking densities with short grazing periods (days to weeks) during the growing season followed by a longer (months) nongrazed time for vegetation regrowth. Despite positive ecological benefits resulting from AMP, livestock production and resultant economic returns are reduced in semiarid rangelands, prompting this investigation into the conditions associated with differences in livestock weight gains under different grazing strategies in these rangelands. We used data from the decadal (2014-2023) Collaborative Adaptive Rangeland Management (CARM) experiment in the semiarid shortgrass steppe of the western Great Plains. For all 6 years (2014-2019) when CARM experienced the highest stock density (10-fold greater than traditional season-long grazing; hereafter TRM), CARM steers had lower grazing season weight gains and beef production than TRM steers (mean reduction of 13.2%). When CARM stock density was reduced 50% (still 5-fold greater than TRM) in 2020-2023, mean weight gains and beef production across the 4 years were just 1% lower in CARM than TRM. In the year with near normal forage production (2021), weight gains and beef production were 10% lower in CARM than TRM, but we did not observe differences between CARM and TRM when forage was limiting in 2 drought years (2020 and 2022), nor when forage production was extraordinarily high (2023). Our findings indicate grazing management practices have the strongest influence on weight gains when forage quantity is moderate, and the effects of management are reduced when forage quantity is very low or very high. This ten-year experiment provides additional evidence that in semiarid rangeland ecosystems, adaptive rotational grazing practices can be associated with a tradeoff between livestock production and the provisioning of other ecosystem services such as grassland bird habitat. Alternative management strategies may be needed for ranchers to minimize this tradeoff. Published by Elsevier Inc. on behalf of The Society for Range Management. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)