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Three trials were conducted to assess the effects of feeding kelp meal to feedlot cattle. In Trial 1, two commercial feedlots were utilized to determine the effects of kelp meal fed to finishing steers exposed to heat stress. Trial 2 was conducted to evaluate the effects of feeding kelp meal in receiving feedlot steer diets. Trial 3 assessed the effects of kelp meal on performance and carcass characteristics when finishing feedlot heifers were exposed to heat stress. Panting scores were reduced in commercial pens of cattle fed kelp meal while dry matter intakes were maintained. Water intake and dry matter intake were not altered when receiving feedlot steers were fed kelp meal. Physiological responses to heat stress were not altered when finishing heifers were fed kelp meal.