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Grazing rangeland during the fall-winter is common on many cattle ranches. Fall-winter grazing of cows generally reduces production costs when compared to feeding a full ration of harvested feeds. Fall-winter range forages alone may not maintain body weight and condition of the cow. Grazing fall-winter range generally has associated cost for supplemental feeds. This paper will look at the effects of protein and grain supplementation on cow performance and the costs of supplements.