Results from an experiment at Kansas State University suggest several advantages for adjusting energy levels for cold weather. This information was gathered during the 1979-1980 winter. Researchers at K-State used 60 commercial cows fed in a dry lot and fed one-half of the cows a steady diet based upon the thermal neutral requirements for body weight maintenance. The other 30 cows were fed a ration adjusted for 1 percent more feed for each degree of coldness. Beef cows exposed to cold require more energy for maintenance therefore the results below indicate the effectiveness of making those adjustments.