Rotational grazing can potentially reduce greenhouse gas (GHG) emissions from animal operations. This study investigates potential GHG reductions from rotational grazing farm operations under alternative procedures for defining a carbon credit. As applied to a case study cow-calf operation, GHG emission credits did not differ substantially under different definitions of entity boundaries. The choice of accounting metric used to report credits (mass load versus load per unit of output), however, would dramatically influence whether a farm would benefit financially from a future market in carbon credits.