Effects of Cold Exposure and Feeding on Net Exchange of Plasma Free Fatty Acids and Glycerol across the Hind Leg of the Young Ox

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Hind leg blood flow (leg Q) and oxygen uptake (leg VO 2 ) and net exchange of free fatty acids (FFA) and glycerol between the leg and the rest of the body was measured in young steers fed either 3 h or 20 h before exposure to a thermoneutral or a moderately cold environment. Cold exposure caused a 10-fold increase in leg VO 2 in both feeding groups, and a highly significant change from net output to net uptake of FFA by the leg in the 20 h-fed, but not the 3 h-fed animals. Net exchange of glycerol was not significantly affected by cold or feeding.